إنشاء مناطق الخدمة Generate Service Areas

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إنشاء مناطق الخدمة Generate Service Areas

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Generate Service Areas Tool

أداة إنشاء مناطق الخدمة

ArcMap ArcGIS

How to use Generate Service Areas Tool in Arc Toolbox ArcMap ArcGIS??

كيفية استخدام أداة إنشاء مناطق الخدمة ؟؟

كيفية استخدام أداة إنشاء مناطق الخدمة ؟؟

Path to access the toolمسار الوصول الى الأداة

:

Generate Service Areas Tool, Server Toolset, Network Analyst Tools Toolbox

Generate Service Areas Tool 

Generate Service Areas

ينشئ طبقة تحليل شبكة منطقة الخدمة ، ويعين خصائص التحليل ، ويحل التحليل. هذه الأداة مثالية لإعداد خدمة معالجة جغرافية لمنطقة خدمة على الويب. منطقة خدمة الشبكة هي منطقة تشمل جميع الشوارع التي يمكن الوصول إليها ضمن مسافة معينة أو وقت السفر من واحد أو أكثر من المرافق.

تُستخدم مناطق الخدمة بشكل شائع لتصور وقياس إمكانية الوصول. على سبيل المثال ، يمكن لمضلع زمن القيادة لمدة 3 دقائق حول محل بقالة تحديد السكان القادرين على الوصول إلى المتجر في غضون 3 دقائق وبالتالي من المرجح أن يتسوقوا هناك.

تتشابه أدوات إنشاء مناطق الخدمة وإنشاء طبقة منطقة الخدمة ، لكنها مصممة لأغراض مختلفة. استخدم إنشاء مناطق الخدمة إذا كنت تقوم بإعداد خدمة معالجة جغرافية ؛ سوف يبسط عملية الإعداد ؛ خلاف ذلك ، استخدم Make Service Area Layer. أيضًا ، استخدم Make Service Area Layer إذا كنت بحاجة إلى إنشاء خطوط منطقة الخدمة ؛ لا يوفر إنشاء مناطق الخدمة خيار إنشاء الخطوط.

لإنشاء خدمة معالجة جغرافية لمنطقة خدمة باستخدام إنشاء مناطق خدمة ، ما عليك سوى إعداد أداة واحدة ، ويمكنك نشر الأداة مباشرةً كخدمة. في المقابل ، تحتاج إلى إنشاء نموذج باستخدام إنشاء طبقة منطقة الخدمة ، وتوصيله بشكل صحيح بالعديد من الأدوات الأخرى ، ونشر النموذج لإنشاء خدمة معالجة جغرافية لمنطقة الخدمة. انظر مثال خدمة المعالجة الجغرافية: مضلعات وقت القيادة لمعرفة كيفية إعداد خدمة مضلعات وقت القيادة باستخدام بيانات البرنامج التعليمي. أحد الخيارات الأخرى التي يجب مراعاتها هو خدمة ArcGIS Online Generate Service Area. تعمل الخدمة كأداة معالجة جغرافية في ArcMap ، ويمكن الوصول إليها من تطبيقات أخرى ، وتتضمن بيانات طريق عالية الجودة لمعظم أنحاء العالم.

Facilities

The facilities around which service areas are generated.

The facilities feature set has three attributes:

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the facility. If the name is empty, blank, or null, a name is automatically generated at solve time.

Break Values

Specifies the size and number of service area polygons to generate for each facility. The units are determined by the Break Units value.

When the Generate Service Areas tool runs, a noteworthy interaction occurs among the following parameters: Break Values, Break Units, and either Time Attribute or Distance Attribute. Together, Break Values and Break Units define how far or how long the service area should extend around the facility or facilities. The Time Attribute and Distance Attribute parameters each define one network cost attribute. Only one of these two cost attributes is used, however, and the one that the solver chooses to use corresponds with the Break Units value; that is, when you specify a time-based Break Units value, such as seconds or minutes, the tool solves using the cost attribute defined in the Time Attribute parameter. When you specify a distance-based Break Units value, such as kilometers or miles, it uses the cost attribute defined in the Distance Attribute parameter.

Multiple polygon breaks can be set to create concentric service areas per facility. For instance, to find 2-, 3-, and 5-mile service areas for each facility, enter 2 3 5, separating the values with a space. Set Break Units to Miles and ensure that you have chosen a distance-based network attribute for the Distance Attribute parameter.

Break Units

The units for the Break Values parameter.

The Generate Service Areas tool chooses whether to use the network cost attribute specified in the Time Attribute or Distance Attribute parameter depending on whether the units you specify here are time or distance based.

The tool performs the necessary units conversion when the Break Units value differs from the units of the corresponding time or distance cost attribute.

Network Dataset

The network dataset on which the analysis will be performed. Network datasets most often represent street networks but may represent other kinds of transportation networks as well. The network dataset needs at least one time-based and one distance-based cost attribute.

Service Areas

The output workspace and name of the output features. This workspace must already exist. The default output workspace is in_memory.

Travel Mode (optional)

Choose the mode of transportation for the analysis. Custom is always a choice. For other travel mode names to appear, they must be present in the network dataset specified in the Network Dataset parameter.

A travel mode is defined on a network dataset and provides override values for parameters that, together, model cars, trucks, pedestrians, or other modes of travel. By choosing a travel mode here, you don't need to provide values for the following parameters, which are overridden by values specified in the network dataset:

Travel Direction (optional)

Choose whether the direction of travel used to generate the service area polygons is toward or away from the facilities.

The direction of travel may change the shape of the polygons because impedances on opposite sides of a street may differ, or one-way streets may exist. The direction you should choose depends on the nature of your service area analysis. The service area for a pizza delivery store, for example, should be created away from the facility, whereas the service area of a hospital should be created toward the facility since the critical travel time for a patient is traveling to the hospital.

Time of Day (optional)

The time to depart from or arrive at the facilities. The interpretation of this value depends on whether travel is toward or away from the facilities.

Your network dataset must include traffic data for this parameter to have any effect.

Repeatedly solving the same analysis, but using different Time of Day values, allows you to see how a facility's reach changes over time. For instance, the 5-minute service area around a fire station may start out large in the early morning, diminish during the morning rush hour, grow in the late morning, and so on, throughout the day.

Time Zone for Time of Day (optional)

Specifies the time zone or zones of the Time of Day parameter.

The scenario above assumes standard time. During daylight saving time, the Eastern, Central, and Mountain Times would each be one hour ahead (that is, 10:00, 9:00, and 8:00 a.m., respectively).

One of the cases in which the UTC option is useful is to visualize emergency-response coverage for a jurisdiction that is split into two time zones. The emergency vehicles are loaded as facilities. Time of Day is set to now in UTC. (You need to determine what the current time and date are in terms of UTC to correctly use this option.) Other properties are set and the analysis is solved. Even though a time-zone boundary divides the vehicles, the results show areas that can be reached given current traffic conditions. This same process can be used for other times as well, not just for now.

Irrespective of the Time Zone for Time of Day setting, all facilities must be in the same time zone when Time of Day has a nonnull value and Polygons for Multiple Facilities is set to create merged or nonoverlapping polygons.

Overrides (optional)

Additional settings that can be used to influence the behavior of the solver.

The value for this parameter is specified in JavaScript Object Notation (JSON) using the form {"overrideSetting1" : "value1", "overrideSetting2" : "value2"}. The override setting names are always enclosed in double quotation marks. The values can be a number, Boolean, or a string.

Overrides are advanced settings that should be used only with careful analysis of the results obtained before and after applying the settings. A list of supported override settings for each solver and their acceptable values can be obtained by contacting Esri Technical Support.

Point Barriers (optional)

Specifies point barriers, which are split into two types: restriction and added cost point barriers. They temporarily restrict traversal across or add impedance to points on the network. The point barriers are defined by a feature set, and the attribute values you specify for the point features determine whether they are restriction or added cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or adds cost when traveling through it. There are two options:

Use the value 0 for Restriction and 2 for Added Cost.

AdditionalCost:

AdditionalCost indicates how much impedance is added when a service area passes through the barrier.

The unit for this field value is the same as the units specified for Break Units.

Line Barriers (optional)

Specifies line barriers, which temporarily restrict traversal across them. The line barriers are defined by a feature set. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

Polygon Barriers (optional)

Specifies polygon barriers, which are split into two types: restriction and scaled cost polygon barriers. They temporarily restrict traversal or scale impedance on the parts of the network they cover. The polygon barriers are defined by a feature set, and the attribute values you specify for the polygon features determine whether they are restriction or scaled cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or scales the cost of traveling through it. There are two options:

Use the value 0 for Restriction and 1 for Scaled Cost.

ScaledCostFactor:

ScaledCostFactor indicates how much the impedance is multiplied by when a service area passes through the barrier.

UTurn Policy (optional)

The U-Turn policy at junctions. Allowing U-turns implies the solver can turn around at a junction and double back on the same street. Given that junctions represent street intersections and dead ends, different vehicles may be able to turn around at some junctions but not at others—it depends on whether the junction represents an intersection or dead end. To accommodate this, the U-turn policy parameter is implicitly specified by how many edges connect to the junction, which is known as junction valency. The acceptable values for this parameter are listed below; each is followed by a description of its meaning in terms of junction valency.

If you need a more precisely defined U-turn policy, consider adding a global turn delay evaluator to a network cost attribute, or adjusting its settings if one exists, and pay particular attention to the configuration of reverse turns. Also, look at setting the CurbApproach property of your network locations.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a time unit.

The tool performs the necessary time-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the time units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute Units (optional)

The units of the network cost attribute specified by the Time Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a distance unit.

The tool performs the necessary distance-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the distance units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute Units (optional)

The units of the network cost attribute specified by the Distance Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Use Hierarchy in Analysis (optional)

The parameter is disabled if a hierarchy attribute is not defined on the network dataset used to perform the analysis.

You can use the Force Hierarchy Beyond Distance parameter to force the solver to use hierarchy even if Use Hierarchy in Analysis is set to false.

This parameter is ignored unless Travel Mode is set to Custom. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

The parameter is not used if a hierarchy attribute is not defined on the network dataset used to perform the analysis. In such cases, use "#" as the parameter value.

You can use the Force_Hierarchy_Beyond_Distance parameter to force the solve to use hierarchy even if Use_Hierarchy_in_Analysis is set to False.

This parameter is ignored unless Travel_Mode is set to CUSTOM. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

Restrictions (optional)

Indicates which network restriction attributes are respected during solve time.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Attribute Parameter Values (optional)

Specifies the parameter values for network attributes that have parameters. The record set has two columns that work together to uniquely identify parameters and another column that specifies the parameter value.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

The attribute parameter values record set has associated attributes. The fields in the attribute table are listed below and described.

ObjectID:

The system-managed ID field.

AttributeName:

The name of the network attribute whose attribute parameter is set by the table row.

ParameterName:

The name of the attribute parameter whose value is set by the table row. (Object type parameters cannot be updated using this tool.)

ParameterValue:

The value you want for the attribute parameter. If a value is not specified, the attribute parameter is set to null.

Polygon Simplification Tolerance (optional)

Specify by how much you want to simplify the polygon geometry.

Simplification maintains critical points of a polygon to define its essential shape and removes other points. The simplification distance you specify is the maximum allowable offset from the original polygon from which the simplified polygon can deviate. Simplifying a polygon reduces the number of vertices and tends to reduce drawing times.

Maximum Snap Tolerance (optional)

The maximum snap tolerance is the furthest distance that Network Analyst searches when locating or relocating a point onto the network. The search looks for suitable edges or junctions and snaps the point to the nearest one. If a suitable location isn't found within the maximum snap tolerance, the object is marked as unlocated.

Exclude Restricted Portions of the Network (optional)

Feature Locator WHERE Clause (optional)

An SQL expression used to select a subset of source features that limits which network elements facilities can be located on. The syntax for this parameter consists of two parts: the first is the source feature class name (followed by a space), and the second is the SQL expression. To write an SQL expression for two or more source feature classes, separate them with a semicolon.

To ensure facilities are not located on limited-access highways, for example, write an SQL expression like the following to exclude those source features: "Streets" "FUNC_CLASS not in('1', '2')".

Note that barriers ignore the feature locator WHERE clause when loading.

Polygons for Multiple Facilities (optional)

Choose how service area polygons are generated when multiple facilities are present in the analysis.

Polygon Overlap Type (optional)

Specifies the option to create concentric service area polygons as disks or rings. This option is applicable only when multiple break values are specified for the facilities.

Detailed Polygons (optional)

Specifies whether to create detailed or generalized polygons.

Polygon Trim Distance (optional)

Specifies the distance within which the service area polygons are trimmed. This is useful when your data is very sparse and you don't want the service area to cover large areas where there are no features.

No value or a value of 0 for this parameter specifies that the service area polygons should not be trimmed. The parameter value is ignored when using hierarchy.

Save Output Network Analysis Layer (optional)

Choose whether the output includes a network analysis layer of the results. In either case, a feature class with service area polygons is returned. However, a server administrator may want to choose to output a network analysis layer as well so the setup and results of the tool can be debugged using the Network Analyst controls in the ArcGIS Desktop environment. This can make the debugging process much easier.

In ArcGIS Desktop, the default output location for the network analysis layer is in the scratch folder. You can determine the location of the scratch folder by evaluating the value of the arcpy.env.scratchFolder geoprocessing environment in the Python window. The output network analysis layer is stored as an LYR file whose name starts with _ags_gpna and is followed by an alphanumeric GUID.

Maximum Facilities (optional)

Limits how many facilities can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Number of Breaks (optional)

Limits how many breaks can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Point Barriers (optional)

Limits how many features can be affected by point barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Line Barriers (optional)

Limits how many features can be affected by line barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Polygon Barriers (optional)

Limits how many features can be affected by polygon barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Time Value (optional)

Limits how large the value of the Break Value parameter can be when solving time-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Distance Value (optional)

Limits how large the value of the Break Value parameter can be when solving distance-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Force Hierarchy beyond Break Time Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving time-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

Force Hierarchy beyond Break Distance Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving distance-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

1.    Facilities خدمات

The facilities around which service areas are generated.

المرافق التي يتم إنشاء مناطق الخدمة حولها.

مجموعة ميزات المرافق لها ثلاث سمات:

معرف الكائن:

حقل المعرف الذي يديره النظام.

شكل:

يشير الحقل الهندسي إلى الموقع الجغرافي لكائن تحليل الشبكة.

اسم:

اسم المنشأة. إذا كان الاسم فارغًا أو فارغًا أو خاليًا ، فسيتم إنشاء الاسم تلقائيًا في وقت الحل.

Break Values

Specifies the size and number of service area polygons to generate for each facility. The units are determined by the Break Units value.

When the Generate Service Areas tool runs, a noteworthy interaction occurs among the following parameters: Break Values, Break Units, and either Time Attribute or Distance Attribute. Together, Break Values and Break Units define how far or how long the service area should extend around the facility or facilities. The Time Attribute and Distance Attribute parameters each define one network cost attribute. Only one of these two cost attributes is used, however, and the one that the solver chooses to use corresponds with the Break Units value; that is, when you specify a time-based Break Units value, such as seconds or minutes, the tool solves using the cost attribute defined in the Time Attribute parameter. When you specify a distance-based Break Units value, such as kilometers or miles, it uses the cost attribute defined in the Distance Attribute parameter.

Multiple polygon breaks can be set to create concentric service areas per facility. For instance, to find 2-, 3-, and 5-mile service areas for each facility, enter 2 3 5, separating the values with a space. Set Break Units to Miles and ensure that you have chosen a distance-based network attribute for the Distance Attribute parameter.

Break Units

The units for the Break Values parameter.

The Generate Service Areas tool chooses whether to use the network cost attribute specified in the Time Attribute or Distance Attribute parameter depending on whether the units you specify here are time or distance based.

The tool performs the necessary units conversion when the Break Units value differs from the units of the corresponding time or distance cost attribute.

Network Dataset

The network dataset on which the analysis will be performed. Network datasets most often represent street networks but may represent other kinds of transportation networks as well. The network dataset needs at least one time-based and one distance-based cost attribute.

Service Areas

The output workspace and name of the output features. This workspace must already exist. The default output workspace is in_memory.

Travel Mode (optional)

Choose the mode of transportation for the analysis. Custom is always a choice. For other travel mode names to appear, they must be present in the network dataset specified in the Network Dataset parameter.

A travel mode is defined on a network dataset and provides override values for parameters that, together, model cars, trucks, pedestrians, or other modes of travel. By choosing a travel mode here, you don't need to provide values for the following parameters, which are overridden by values specified in the network dataset:

Travel Direction (optional)

Choose whether the direction of travel used to generate the service area polygons is toward or away from the facilities.

The direction of travel may change the shape of the polygons because impedances on opposite sides of a street may differ, or one-way streets may exist. The direction you should choose depends on the nature of your service area analysis. The service area for a pizza delivery store, for example, should be created away from the facility, whereas the service area of a hospital should be created toward the facility since the critical travel time for a patient is traveling to the hospital.

Time of Day (optional)

The time to depart from or arrive at the facilities. The interpretation of this value depends on whether travel is toward or away from the facilities.

Your network dataset must include traffic data for this parameter to have any effect.

Repeatedly solving the same analysis, but using different Time of Day values, allows you to see how a facility's reach changes over time. For instance, the 5-minute service area around a fire station may start out large in the early morning, diminish during the morning rush hour, grow in the late morning, and so on, throughout the day.

Time Zone for Time of Day (optional)

Specifies the time zone or zones of the Time of Day parameter.

The scenario above assumes standard time. During daylight saving time, the Eastern, Central, and Mountain Times would each be one hour ahead (that is, 10:00, 9:00, and 8:00 a.m., respectively).

One of the cases in which the UTC option is useful is to visualize emergency-response coverage for a jurisdiction that is split into two time zones. The emergency vehicles are loaded as facilities. Time of Day is set to now in UTC. (You need to determine what the current time and date are in terms of UTC to correctly use this option.) Other properties are set and the analysis is solved. Even though a time-zone boundary divides the vehicles, the results show areas that can be reached given current traffic conditions. This same process can be used for other times as well, not just for now.

Irrespective of the Time Zone for Time of Day setting, all facilities must be in the same time zone when Time of Day has a nonnull value and Polygons for Multiple Facilities is set to create merged or nonoverlapping polygons.

Overrides (optional)

Additional settings that can be used to influence the behavior of the solver.

The value for this parameter is specified in JavaScript Object Notation (JSON) using the form {"overrideSetting1" : "value1", "overrideSetting2" : "value2"}. The override setting names are always enclosed in double quotation marks. The values can be a number, Boolean, or a string.

Overrides are advanced settings that should be used only with careful analysis of the results obtained before and after applying the settings. A list of supported override settings for each solver and their acceptable values can be obtained by contacting Esri Technical Support.

Point Barriers (optional)

Specifies point barriers, which are split into two types: restriction and added cost point barriers. They temporarily restrict traversal across or add impedance to points on the network. The point barriers are defined by a feature set, and the attribute values you specify for the point features determine whether they are restriction or added cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or adds cost when traveling through it. There are two options:

Use the value 0 for Restriction and 2 for Added Cost.

AdditionalCost:

AdditionalCost indicates how much impedance is added when a service area passes through the barrier.

The unit for this field value is the same as the units specified for Break Units.

Line Barriers (optional)

Specifies line barriers, which temporarily restrict traversal across them. The line barriers are defined by a feature set. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

Polygon Barriers (optional)

Specifies polygon barriers, which are split into two types: restriction and scaled cost polygon barriers. They temporarily restrict traversal or scale impedance on the parts of the network they cover. The polygon barriers are defined by a feature set, and the attribute values you specify for the polygon features determine whether they are restriction or scaled cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or scales the cost of traveling through it. There are two options:

Use the value 0 for Restriction and 1 for Scaled Cost.

ScaledCostFactor:

ScaledCostFactor indicates how much the impedance is multiplied by when a service area passes through the barrier.

UTurn Policy (optional)

The U-Turn policy at junctions. Allowing U-turns implies the solver can turn around at a junction and double back on the same street. Given that junctions represent street intersections and dead ends, different vehicles may be able to turn around at some junctions but not at others—it depends on whether the junction represents an intersection or dead end. To accommodate this, the U-turn policy parameter is implicitly specified by how many edges connect to the junction, which is known as junction valency. The acceptable values for this parameter are listed below; each is followed by a description of its meaning in terms of junction valency.

If you need a more precisely defined U-turn policy, consider adding a global turn delay evaluator to a network cost attribute, or adjusting its settings if one exists, and pay particular attention to the configuration of reverse turns. Also, look at setting the CurbApproach property of your network locations.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a time unit.

The tool performs the necessary time-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the time units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute Units (optional)

The units of the network cost attribute specified by the Time Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a distance unit.

The tool performs the necessary distance-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the distance units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute Units (optional)

The units of the network cost attribute specified by the Distance Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Use Hierarchy in Analysis (optional)

The parameter is disabled if a hierarchy attribute is not defined on the network dataset used to perform the analysis.

You can use the Force Hierarchy Beyond Distance parameter to force the solver to use hierarchy even if Use Hierarchy in Analysis is set to false.

This parameter is ignored unless Travel Mode is set to Custom. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

The parameter is not used if a hierarchy attribute is not defined on the network dataset used to perform the analysis. In such cases, use "#" as the parameter value.

You can use the Force_Hierarchy_Beyond_Distance parameter to force the solve to use hierarchy even if Use_Hierarchy_in_Analysis is set to False.

This parameter is ignored unless Travel_Mode is set to CUSTOM. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

Restrictions (optional)

Indicates which network restriction attributes are respected during solve time.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Attribute Parameter Values (optional)

Specifies the parameter values for network attributes that have parameters. The record set has two columns that work together to uniquely identify parameters and another column that specifies the parameter value.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

The attribute parameter values record set has associated attributes. The fields in the attribute table are listed below and described.

ObjectID:

The system-managed ID field.

AttributeName:

The name of the network attribute whose attribute parameter is set by the table row.

ParameterName:

The name of the attribute parameter whose value is set by the table row. (Object type parameters cannot be updated using this tool.)

ParameterValue:

The value you want for the attribute parameter. If a value is not specified, the attribute parameter is set to null.

Polygon Simplification Tolerance (optional)

Specify by how much you want to simplify the polygon geometry.

Simplification maintains critical points of a polygon to define its essential shape and removes other points. The simplification distance you specify is the maximum allowable offset from the original polygon from which the simplified polygon can deviate. Simplifying a polygon reduces the number of vertices and tends to reduce drawing times.

Maximum Snap Tolerance (optional)

The maximum snap tolerance is the furthest distance that Network Analyst searches when locating or relocating a point onto the network. The search looks for suitable edges or junctions and snaps the point to the nearest one. If a suitable location isn't found within the maximum snap tolerance, the object is marked as unlocated.

Exclude Restricted Portions of the Network (optional)

Feature Locator WHERE Clause (optional)

An SQL expression used to select a subset of source features that limits which network elements facilities can be located on. The syntax for this parameter consists of two parts: the first is the source feature class name (followed by a space), and the second is the SQL expression. To write an SQL expression for two or more source feature classes, separate them with a semicolon.

To ensure facilities are not located on limited-access highways, for example, write an SQL expression like the following to exclude those source features: "Streets" "FUNC_CLASS not in('1', '2')".

Note that barriers ignore the feature locator WHERE clause when loading.

Polygons for Multiple Facilities (optional)

Choose how service area polygons are generated when multiple facilities are present in the analysis.

Polygon Overlap Type (optional)

Specifies the option to create concentric service area polygons as disks or rings. This option is applicable only when multiple break values are specified for the facilities.

Detailed Polygons (optional)

Specifies whether to create detailed or generalized polygons.

Polygon Trim Distance (optional)

Specifies the distance within which the service area polygons are trimmed. This is useful when your data is very sparse and you don't want the service area to cover large areas where there are no features.

No value or a value of 0 for this parameter specifies that the service area polygons should not be trimmed. The parameter value is ignored when using hierarchy.

Save Output Network Analysis Layer (optional)

Choose whether the output includes a network analysis layer of the results. In either case, a feature class with service area polygons is returned. However, a server administrator may want to choose to output a network analysis layer as well so the setup and results of the tool can be debugged using the Network Analyst controls in the ArcGIS Desktop environment. This can make the debugging process much easier.

In ArcGIS Desktop, the default output location for the network analysis layer is in the scratch folder. You can determine the location of the scratch folder by evaluating the value of the arcpy.env.scratchFolder geoprocessing environment in the Python window. The output network analysis layer is stored as an LYR file whose name starts with _ags_gpna and is followed by an alphanumeric GUID.

Maximum Facilities (optional)

Limits how many facilities can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Number of Breaks (optional)

Limits how many breaks can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Point Barriers (optional)

Limits how many features can be affected by point barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Line Barriers (optional)

Limits how many features can be affected by line barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Polygon Barriers (optional)

Limits how many features can be affected by polygon barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Time Value (optional)

Limits how large the value of the Break Value parameter can be when solving time-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Distance Value (optional)

Limits how large the value of the Break Value parameter can be when solving distance-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Force Hierarchy beyond Break Time Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving time-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

Force Hierarchy beyond Break Distance Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving distance-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

2.    Break Values قيم الراحة

Specifies the size and number of service area polygons to generate for each facility. The units are determined by the Break Units value.

يحدد حجم وعدد مضلعات منطقة الخدمة المراد إنشاؤها لكل منشأة. يتم تحديد الوحدات حسب قيمة وحدات الفاصل.

عند تشغيل أداة إنشاء مناطق الخدمة ، يحدث تفاعل جدير بالملاحظة بين المعلمات التالية: كسر القيم ، ووحدات الفاصل ، وإما سمة الوقت أو سمة المسافة. تحدد قيم القطع ووحدات الاستراحة معًا إلى أي مدى أو إلى متى يجب أن تمتد منطقة الخدمة حول المنشأة أو المرافق. تحدد كل من معلمات سمة الوقت وخاصية المسافة سمة واحدة لتكلفة الشبكة. يتم استخدام سمة واحدة فقط من هاتين الخاصيتين من سمات التكلفة ، ومع ذلك ، فإن السمة التي يختارها المحلل لاستخدامها تتوافق مع قيمة وحدات الفاصل ؛ أي عندما تحدد قيمة وحدات فاصل مستندة إلى الوقت ، مثل الثواني أو الدقائق ، تحل الأداة باستخدام سمة التكلفة المحددة في معلمة سمة الوقت. عندما تحدد قيمة وحدات فاصل تعتمد على المسافة ، مثل الكيلومترات أو الأميال ، فإنها تستخدم سمة التكلفة المحددة في معلمة سمة المسافة.

يمكن تعيين فواصل متعددة الأضلاع لإنشاء مناطق خدمة متحدة المركز لكل منشأة. على سبيل المثال ، للعثور على مناطق خدمة 2 و 3 و 5 أميال لكل منشأة ، أدخل 2 3 5 ، وافصل القيم بمسافة. عيّن وحدات الفاصل إلى أميال وتأكد من أنك قد اخترت سمة شبكة تعتمد على المسافة لمعلمة سمة المسافة.

Break Units

The units for the Break Values parameter.

The Generate Service Areas tool chooses whether to use the network cost attribute specified in the Time Attribute or Distance Attribute parameter depending on whether the units you specify here are time or distance based.

The tool performs the necessary units conversion when the Break Units value differs from the units of the corresponding time or distance cost attribute.

Network Dataset

The network dataset on which the analysis will be performed. Network datasets most often represent street networks but may represent other kinds of transportation networks as well. The network dataset needs at least one time-based and one distance-based cost attribute.

Service Areas

The output workspace and name of the output features. This workspace must already exist. The default output workspace is in_memory.

Travel Mode (optional)

Choose the mode of transportation for the analysis. Custom is always a choice. For other travel mode names to appear, they must be present in the network dataset specified in the Network Dataset parameter.

A travel mode is defined on a network dataset and provides override values for parameters that, together, model cars, trucks, pedestrians, or other modes of travel. By choosing a travel mode here, you don't need to provide values for the following parameters, which are overridden by values specified in the network dataset:

Travel Direction (optional)

Choose whether the direction of travel used to generate the service area polygons is toward or away from the facilities.

The direction of travel may change the shape of the polygons because impedances on opposite sides of a street may differ, or one-way streets may exist. The direction you should choose depends on the nature of your service area analysis. The service area for a pizza delivery store, for example, should be created away from the facility, whereas the service area of a hospital should be created toward the facility since the critical travel time for a patient is traveling to the hospital.

Time of Day (optional)

The time to depart from or arrive at the facilities. The interpretation of this value depends on whether travel is toward or away from the facilities.

Your network dataset must include traffic data for this parameter to have any effect.

Repeatedly solving the same analysis, but using different Time of Day values, allows you to see how a facility's reach changes over time. For instance, the 5-minute service area around a fire station may start out large in the early morning, diminish during the morning rush hour, grow in the late morning, and so on, throughout the day.

Time Zone for Time of Day (optional)

Specifies the time zone or zones of the Time of Day parameter.

The scenario above assumes standard time. During daylight saving time, the Eastern, Central, and Mountain Times would each be one hour ahead (that is, 10:00, 9:00, and 8:00 a.m., respectively).

One of the cases in which the UTC option is useful is to visualize emergency-response coverage for a jurisdiction that is split into two time zones. The emergency vehicles are loaded as facilities. Time of Day is set to now in UTC. (You need to determine what the current time and date are in terms of UTC to correctly use this option.) Other properties are set and the analysis is solved. Even though a time-zone boundary divides the vehicles, the results show areas that can be reached given current traffic conditions. This same process can be used for other times as well, not just for now.

Irrespective of the Time Zone for Time of Day setting, all facilities must be in the same time zone when Time of Day has a nonnull value and Polygons for Multiple Facilities is set to create merged or nonoverlapping polygons.

Overrides (optional)

Additional settings that can be used to influence the behavior of the solver.

The value for this parameter is specified in JavaScript Object Notation (JSON) using the form {"overrideSetting1" : "value1", "overrideSetting2" : "value2"}. The override setting names are always enclosed in double quotation marks. The values can be a number, Boolean, or a string.

Overrides are advanced settings that should be used only with careful analysis of the results obtained before and after applying the settings. A list of supported override settings for each solver and their acceptable values can be obtained by contacting Esri Technical Support.

Point Barriers (optional)

Specifies point barriers, which are split into two types: restriction and added cost point barriers. They temporarily restrict traversal across or add impedance to points on the network. The point barriers are defined by a feature set, and the attribute values you specify for the point features determine whether they are restriction or added cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or adds cost when traveling through it. There are two options:

Use the value 0 for Restriction and 2 for Added Cost.

AdditionalCost:

AdditionalCost indicates how much impedance is added when a service area passes through the barrier.

The unit for this field value is the same as the units specified for Break Units.

Line Barriers (optional)

Specifies line barriers, which temporarily restrict traversal across them. The line barriers are defined by a feature set. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

Polygon Barriers (optional)

Specifies polygon barriers, which are split into two types: restriction and scaled cost polygon barriers. They temporarily restrict traversal or scale impedance on the parts of the network they cover. The polygon barriers are defined by a feature set, and the attribute values you specify for the polygon features determine whether they are restriction or scaled cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or scales the cost of traveling through it. There are two options:

Use the value 0 for Restriction and 1 for Scaled Cost.

ScaledCostFactor:

ScaledCostFactor indicates how much the impedance is multiplied by when a service area passes through the barrier.

UTurn Policy (optional)

The U-Turn policy at junctions. Allowing U-turns implies the solver can turn around at a junction and double back on the same street. Given that junctions represent street intersections and dead ends, different vehicles may be able to turn around at some junctions but not at others—it depends on whether the junction represents an intersection or dead end. To accommodate this, the U-turn policy parameter is implicitly specified by how many edges connect to the junction, which is known as junction valency. The acceptable values for this parameter are listed below; each is followed by a description of its meaning in terms of junction valency.

If you need a more precisely defined U-turn policy, consider adding a global turn delay evaluator to a network cost attribute, or adjusting its settings if one exists, and pay particular attention to the configuration of reverse turns. Also, look at setting the CurbApproach property of your network locations.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a time unit.

The tool performs the necessary time-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the time units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute Units (optional)

The units of the network cost attribute specified by the Time Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a distance unit.

The tool performs the necessary distance-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the distance units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute Units (optional)

The units of the network cost attribute specified by the Distance Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Use Hierarchy in Analysis (optional)

The parameter is disabled if a hierarchy attribute is not defined on the network dataset used to perform the analysis.

You can use the Force Hierarchy Beyond Distance parameter to force the solver to use hierarchy even if Use Hierarchy in Analysis is set to false.

This parameter is ignored unless Travel Mode is set to Custom. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

The parameter is not used if a hierarchy attribute is not defined on the network dataset used to perform the analysis. In such cases, use "#" as the parameter value.

You can use the Force_Hierarchy_Beyond_Distance parameter to force the solve to use hierarchy even if Use_Hierarchy_in_Analysis is set to False.

This parameter is ignored unless Travel_Mode is set to CUSTOM. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

Restrictions (optional)

Indicates which network restriction attributes are respected during solve time.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Attribute Parameter Values (optional)

Specifies the parameter values for network attributes that have parameters. The record set has two columns that work together to uniquely identify parameters and another column that specifies the parameter value.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

The attribute parameter values record set has associated attributes. The fields in the attribute table are listed below and described.

ObjectID:

The system-managed ID field.

AttributeName:

The name of the network attribute whose attribute parameter is set by the table row.

ParameterName:

The name of the attribute parameter whose value is set by the table row. (Object type parameters cannot be updated using this tool.)

ParameterValue:

The value you want for the attribute parameter. If a value is not specified, the attribute parameter is set to null.

Polygon Simplification Tolerance (optional)

Specify by how much you want to simplify the polygon geometry.

Simplification maintains critical points of a polygon to define its essential shape and removes other points. The simplification distance you specify is the maximum allowable offset from the original polygon from which the simplified polygon can deviate. Simplifying a polygon reduces the number of vertices and tends to reduce drawing times.

Maximum Snap Tolerance (optional)

The maximum snap tolerance is the furthest distance that Network Analyst searches when locating or relocating a point onto the network. The search looks for suitable edges or junctions and snaps the point to the nearest one. If a suitable location isn't found within the maximum snap tolerance, the object is marked as unlocated.

Exclude Restricted Portions of the Network (optional)

Feature Locator WHERE Clause (optional)

An SQL expression used to select a subset of source features that limits which network elements facilities can be located on. The syntax for this parameter consists of two parts: the first is the source feature class name (followed by a space), and the second is the SQL expression. To write an SQL expression for two or more source feature classes, separate them with a semicolon.

To ensure facilities are not located on limited-access highways, for example, write an SQL expression like the following to exclude those source features: "Streets" "FUNC_CLASS not in('1', '2')".

Note that barriers ignore the feature locator WHERE clause when loading.

Polygons for Multiple Facilities (optional)

Choose how service area polygons are generated when multiple facilities are present in the analysis.

Polygon Overlap Type (optional)

Specifies the option to create concentric service area polygons as disks or rings. This option is applicable only when multiple break values are specified for the facilities.

Detailed Polygons (optional)

Specifies whether to create detailed or generalized polygons.

Polygon Trim Distance (optional)

Specifies the distance within which the service area polygons are trimmed. This is useful when your data is very sparse and you don't want the service area to cover large areas where there are no features.

No value or a value of 0 for this parameter specifies that the service area polygons should not be trimmed. The parameter value is ignored when using hierarchy.

Save Output Network Analysis Layer (optional)

Choose whether the output includes a network analysis layer of the results. In either case, a feature class with service area polygons is returned. However, a server administrator may want to choose to output a network analysis layer as well so the setup and results of the tool can be debugged using the Network Analyst controls in the ArcGIS Desktop environment. This can make the debugging process much easier.

In ArcGIS Desktop, the default output location for the network analysis layer is in the scratch folder. You can determine the location of the scratch folder by evaluating the value of the arcpy.env.scratchFolder geoprocessing environment in the Python window. The output network analysis layer is stored as an LYR file whose name starts with _ags_gpna and is followed by an alphanumeric GUID.

Maximum Facilities (optional)

Limits how many facilities can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Number of Breaks (optional)

Limits how many breaks can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Point Barriers (optional)

Limits how many features can be affected by point barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Line Barriers (optional)

Limits how many features can be affected by line barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Polygon Barriers (optional)

Limits how many features can be affected by polygon barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Time Value (optional)

Limits how large the value of the Break Value parameter can be when solving time-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Distance Value (optional)

Limits how large the value of the Break Value parameter can be when solving distance-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Force Hierarchy beyond Break Time Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving time-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

Force Hierarchy beyond Break Distance Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving distance-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

3.    Break Units وحدات الراحة

The units for the Break Values parameter.

وحدات المعلمة Break Values.

• أمتار

• كيلومترات

•قدم

• ساحات

•اميال

• أميال بحرية

• ثواني

•الدقائق

•ساعات

•أيام

تختار أداة إنشاء مناطق الخدمة ما إذا كنت ستستخدم سمة تكلفة الشبكة المحددة في سمة الوقت أو سمة المسافة بناءً على ما إذا كانت الوحدات التي تحددها هنا تعتمد على الوقت أو المسافة.

تقوم الأداة بتحويل الوحدات الضرورية عندما تختلف قيمة وحدات الفاصل عن وحدات سمة تكلفة المسافة أو الوقت المقابلة.

Network Dataset

The network dataset on which the analysis will be performed. Network datasets most often represent street networks but may represent other kinds of transportation networks as well. The network dataset needs at least one time-based and one distance-based cost attribute.

Service Areas

The output workspace and name of the output features. This workspace must already exist. The default output workspace is in_memory.

Travel Mode (optional)

Choose the mode of transportation for the analysis. Custom is always a choice. For other travel mode names to appear, they must be present in the network dataset specified in the Network Dataset parameter.

A travel mode is defined on a network dataset and provides override values for parameters that, together, model cars, trucks, pedestrians, or other modes of travel. By choosing a travel mode here, you don't need to provide values for the following parameters, which are overridden by values specified in the network dataset:

Travel Direction (optional)

Choose whether the direction of travel used to generate the service area polygons is toward or away from the facilities.

The direction of travel may change the shape of the polygons because impedances on opposite sides of a street may differ, or one-way streets may exist. The direction you should choose depends on the nature of your service area analysis. The service area for a pizza delivery store, for example, should be created away from the facility, whereas the service area of a hospital should be created toward the facility since the critical travel time for a patient is traveling to the hospital.

Time of Day (optional)

The time to depart from or arrive at the facilities. The interpretation of this value depends on whether travel is toward or away from the facilities.

Your network dataset must include traffic data for this parameter to have any effect.

Repeatedly solving the same analysis, but using different Time of Day values, allows you to see how a facility's reach changes over time. For instance, the 5-minute service area around a fire station may start out large in the early morning, diminish during the morning rush hour, grow in the late morning, and so on, throughout the day.

Time Zone for Time of Day (optional)

Specifies the time zone or zones of the Time of Day parameter.

The scenario above assumes standard time. During daylight saving time, the Eastern, Central, and Mountain Times would each be one hour ahead (that is, 10:00, 9:00, and 8:00 a.m., respectively).

One of the cases in which the UTC option is useful is to visualize emergency-response coverage for a jurisdiction that is split into two time zones. The emergency vehicles are loaded as facilities. Time of Day is set to now in UTC. (You need to determine what the current time and date are in terms of UTC to correctly use this option.) Other properties are set and the analysis is solved. Even though a time-zone boundary divides the vehicles, the results show areas that can be reached given current traffic conditions. This same process can be used for other times as well, not just for now.

Irrespective of the Time Zone for Time of Day setting, all facilities must be in the same time zone when Time of Day has a nonnull value and Polygons for Multiple Facilities is set to create merged or nonoverlapping polygons.

Overrides (optional)

Additional settings that can be used to influence the behavior of the solver.

The value for this parameter is specified in JavaScript Object Notation (JSON) using the form {"overrideSetting1" : "value1", "overrideSetting2" : "value2"}. The override setting names are always enclosed in double quotation marks. The values can be a number, Boolean, or a string.

Overrides are advanced settings that should be used only with careful analysis of the results obtained before and after applying the settings. A list of supported override settings for each solver and their acceptable values can be obtained by contacting Esri Technical Support.

Point Barriers (optional)

Specifies point barriers, which are split into two types: restriction and added cost point barriers. They temporarily restrict traversal across or add impedance to points on the network. The point barriers are defined by a feature set, and the attribute values you specify for the point features determine whether they are restriction or added cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or adds cost when traveling through it. There are two options:

Use the value 0 for Restriction and 2 for Added Cost.

AdditionalCost:

AdditionalCost indicates how much impedance is added when a service area passes through the barrier.

The unit for this field value is the same as the units specified for Break Units.

Line Barriers (optional)

Specifies line barriers, which temporarily restrict traversal across them. The line barriers are defined by a feature set. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

Polygon Barriers (optional)

Specifies polygon barriers, which are split into two types: restriction and scaled cost polygon barriers. They temporarily restrict traversal or scale impedance on the parts of the network they cover. The polygon barriers are defined by a feature set, and the attribute values you specify for the polygon features determine whether they are restriction or scaled cost barriers. The fields in the attribute table are listed and described below.

ObjectID:

The system-managed ID field.

Shape:

The geometry field indicating the geographic location of the network analysis object.

Name:

The name of the barrier.

BarrierType:

Specifies whether the barrier restricts travel completely or scales the cost of traveling through it. There are two options:

Use the value 0 for Restriction and 1 for Scaled Cost.

ScaledCostFactor:

ScaledCostFactor indicates how much the impedance is multiplied by when a service area passes through the barrier.

UTurn Policy (optional)

The U-Turn policy at junctions. Allowing U-turns implies the solver can turn around at a junction and double back on the same street. Given that junctions represent street intersections and dead ends, different vehicles may be able to turn around at some junctions but not at others—it depends on whether the junction represents an intersection or dead end. To accommodate this, the U-turn policy parameter is implicitly specified by how many edges connect to the junction, which is known as junction valency. The acceptable values for this parameter are listed below; each is followed by a description of its meaning in terms of junction valency.

If you need a more precisely defined U-turn policy, consider adding a global turn delay evaluator to a network cost attribute, or adjusting its settings if one exists, and pay particular attention to the configuration of reverse turns. Also, look at setting the CurbApproach property of your network locations.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a time unit.

The tool performs the necessary time-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the time units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Time Attribute Units (optional)

The units of the network cost attribute specified by the Time Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute (optional)

Defines the network cost attribute to use when the Break Units value is a distance unit.

The tool performs the necessary distance-unit conversion when the Break Units value differs from the units of the cost attribute defined here. In other words, the distance units of the breaks and the network cost attribute don't need to be the same.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Distance Attribute Units (optional)

The units of the network cost attribute specified by the Distance Attribute parameter. This is merely an informational parameter that cannot be changed without directly editing the network dataset. It is also unnecessary to change since the unit conversions between break value units and the cost attribute are handled for you.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Use Hierarchy in Analysis (optional)

The parameter is disabled if a hierarchy attribute is not defined on the network dataset used to perform the analysis.

You can use the Force Hierarchy Beyond Distance parameter to force the solver to use hierarchy even if Use Hierarchy in Analysis is set to false.

This parameter is ignored unless Travel Mode is set to Custom. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

The parameter is not used if a hierarchy attribute is not defined on the network dataset used to perform the analysis. In such cases, use "#" as the parameter value.

You can use the Force_Hierarchy_Beyond_Distance parameter to force the solve to use hierarchy even if Use_Hierarchy_in_Analysis is set to False.

This parameter is ignored unless Travel_Mode is set to CUSTOM. When modeling a custom walking mode, it is recommended to turn off hierarchy since the hierarchy is designed for motorized vehicles.

Restrictions (optional)

Indicates which network restriction attributes are respected during solve time.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

Attribute Parameter Values (optional)

Specifies the parameter values for network attributes that have parameters. The record set has two columns that work together to uniquely identify parameters and another column that specifies the parameter value.

The value of this parameter is overridden when Travel Mode (Travel_Mode in Python) is set to any value other than custom.

The attribute parameter values record set has associated attributes. The fields in the attribute table are listed below and described.

ObjectID:

The system-managed ID field.

AttributeName:

The name of the network attribute whose attribute parameter is set by the table row.

ParameterName:

The name of the attribute parameter whose value is set by the table row. (Object type parameters cannot be updated using this tool.)

ParameterValue:

The value you want for the attribute parameter. If a value is not specified, the attribute parameter is set to null.

Polygon Simplification Tolerance (optional)

Specify by how much you want to simplify the polygon geometry.

Simplification maintains critical points of a polygon to define its essential shape and removes other points. The simplification distance you specify is the maximum allowable offset from the original polygon from which the simplified polygon can deviate. Simplifying a polygon reduces the number of vertices and tends to reduce drawing times.

Maximum Snap Tolerance (optional)

The maximum snap tolerance is the furthest distance that Network Analyst searches when locating or relocating a point onto the network. The search looks for suitable edges or junctions and snaps the point to the nearest one. If a suitable location isn't found within the maximum snap tolerance, the object is marked as unlocated.

Exclude Restricted Portions of the Network (optional)

Feature Locator WHERE Clause (optional)

An SQL expression used to select a subset of source features that limits which network elements facilities can be located on. The syntax for this parameter consists of two parts: the first is the source feature class name (followed by a space), and the second is the SQL expression. To write an SQL expression for two or more source feature classes, separate them with a semicolon.

To ensure facilities are not located on limited-access highways, for example, write an SQL expression like the following to exclude those source features: "Streets" "FUNC_CLASS not in('1', '2')".

Note that barriers ignore the feature locator WHERE clause when loading.

Polygons for Multiple Facilities (optional)

Choose how service area polygons are generated when multiple facilities are present in the analysis.

Polygon Overlap Type (optional)

Specifies the option to create concentric service area polygons as disks or rings. This option is applicable only when multiple break values are specified for the facilities.

Detailed Polygons (optional)

Specifies whether to create detailed or generalized polygons.

Polygon Trim Distance (optional)

Specifies the distance within which the service area polygons are trimmed. This is useful when your data is very sparse and you don't want the service area to cover large areas where there are no features.

No value or a value of 0 for this parameter specifies that the service area polygons should not be trimmed. The parameter value is ignored when using hierarchy.

Save Output Network Analysis Layer (optional)

Choose whether the output includes a network analysis layer of the results. In either case, a feature class with service area polygons is returned. However, a server administrator may want to choose to output a network analysis layer as well so the setup and results of the tool can be debugged using the Network Analyst controls in the ArcGIS Desktop environment. This can make the debugging process much easier.

In ArcGIS Desktop, the default output location for the network analysis layer is in the scratch folder. You can determine the location of the scratch folder by evaluating the value of the arcpy.env.scratchFolder geoprocessing environment in the Python window. The output network analysis layer is stored as an LYR file whose name starts with _ags_gpna and is followed by an alphanumeric GUID.

Maximum Facilities (optional)

Limits how many facilities can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Number of Breaks (optional)

Limits how many breaks can be added to the service area analysis.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Point Barriers (optional)

Limits how many features can be affected by point barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Line Barriers (optional)

Limits how many features can be affected by line barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Features Affected by Polygon Barriers (optional)

Limits how many features can be affected by polygon barriers.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Time Value (optional)

Limits how large the value of the Break Value parameter can be when solving time-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Maximum Break Distance Value (optional)

Limits how large the value of the Break Value parameter can be when solving distance-based service areas.

This parameter helps you govern the amount of processing that occurs when solving. For example, you could assign a low value to this parameter for a free version of the service you are creating and use a higher value for a paid-subscription version of the service.

A null value indicates there is no limit.

Force Hierarchy beyond Break Time Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving time-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

Force Hierarchy beyond Break Distance Value (optional)

Specifies the break value after which the solver will force hierarchy even if hierarchy was not enabled when solving distance-based service areas.

Solving service areas for high break values while using the network's hierarchy tends to incur much less processing than solving the same service areas without using the hierarchy. This parameter helps you govern the amount of processing that occurs when solving.

A null value indicates that the hierarchy will never be enforced and the value of the Use Hierarchy in Analysis parameter will always be honored. If the input network dataset does not support hierarchy, specifying a value for this parameter will result in an error. A null value should be used in this case.

4.    Network Dataset مجموعة بيانات الشبكة

The network dataset on which the analysis will be performed. Network datasets most often represent street networks but may represent other kinds of transportation networks as well. The network dataset needs at least one time-based and one distance-based cost attribute.

مجموعة بيانات الشبكة التي سيتم إجراء التحليل عليها. غالبًا ما تمثل مجموعات بيانات الشبكة شبكات الشوارع ولكنها قد تمثل أيضًا أنواعًا أخرى من شبكات النقل. تحتاج مجموعة بيانات الشبكة إلى سمة تكلفة واحدة تستند إلى الوقت وواحدة على الأقل تستند إلى المسافة.

5.    Service Areas مناطق الخدمة

The output workspace and name of the output features. This workspace must already exist. The default output workspace is in_memory.

مساحة عمل الإخراج واسم ميزات الإخراج. يجب أن تكون مساحة العمل هذه موجودة بالفعل. مساحة عمل الإخراج الافتراضية هي in_memory.

6.    Travel Mode (optional) وضع السفر (اختياري)

Choose the mode of transportation for the analysis. Custom is always a choice. For other travel mode names to appear, they must be present in the network dataset specified in the Network Dataset parameter.

اختر وسيلة النقل للتحليل. العرف هو دائما اختيار. لكي تظهر أسماء أوضاع السفر الأخرى ، يجب أن تكون موجودة في مجموعة بيانات الشبكة المحددة في معلمة مجموعة بيانات الشبكة.

يتم تحديد وضع السفر في مجموعة بيانات الشبكة ويوفر قيم تجاوز للمعلمات التي تعمل معًا على تشكيل السيارات أو الشاحنات أو المشاة أو أوضاع السفر الأخرى. باختيار وضع السفر هنا ، لا تحتاج إلى توفير قيم للمعلمات التالية ، والتي يتم تجاوزها بالقيم المحددة في مجموعة بيانات الشبكة:

• سياسة UTurn

• سمة الوقت

• وحدات سمة الوقت

• سمة المسافة

• وحدات سمات المسافة

• استخدام التسلسل الهرمي في التحليل

•قيود

• قيم معلمة السمة

• التسامح التبسيط المضلع

CUSTOM - حدد وضع السفر الذي يناسب احتياجاتك الخاصة. عند اختيار Custom ، لا تتجاوز الأداة معلمات وضع السفر المذكورة أعلاه. هذه هي القيمة الافتراضية.

12. Advanced Analysis التحليل المتقدم

13. Barriers الحواجز
14. Custom Travel Mode وضع السفر المخصص 
15. Network Dataset مجموعة بيانات الشبكة
16. Network Location موقع الشبكة
17. Output مخرج
18. Service Capabilities قدرات الخدمة

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