analysisLayer

(Required)

The point, line, or polygon features to be analyzed.

Syntax: As described in detail in the Feature input topic, this parameter can be one of the following:

• A URL to a feature service layer with an optional filter to select specific features
• A feature collection

Examples:

• {"url": <feature service layer url>, "filter": <where clause>}
• {"layerDefinition": {}, "featureSet": {}, "filter": <where clause>}

summarizeType

The method with which to summarize the analysisLayer.

Values: CentralFeature | MeanCenter | MedianCenter | Ellipse

Example: " summarizeType": "CentralFeature"

ellipseSize

The size of the output ellipse in standard deviations. The default ellipse size is 1. Valid choices are 1, 2, or 3 standard deviations.

Examples:

• "ellipseSize": "1 standard deviation"
• "ellipseSize": "2 standard deviations"
• "ellipseSize": "3 standard deviations"

weightField

A numeric field in the analysisLayer to be used to weight locations according to their relative importance.

Example: "weightField": "NumEmployees"

groupField

The field used to group features for separate directional distribution calculations. The groupField can be of integer, date, or string type.

Example: "groupField": "Country"

OutputName

If provided, the task will create a feature service of the results. You define the name of the service. If an outputName value is not provided, the task will return a feature collection.

{
  "serviceProperties": {
    "name": "<service name>"
  }
}

{

  "itemProperties": {
			"itemId": "<itemID of the existing feature service>",
			"overwrite": True
	}
}

{
"serviceProperties": {
    "name": "<existing service name>"
  },
"itemProperties": {
				"itemId": "<itemID of the existing feature service>",
				"overwrite": True
	}
}

Context

The Context parameter contains the following additional settings that affect task operation:

• Extent (extent)—A bounding box that defines the analysis area. Only input features that intersect the bounding box will be analyzed.
• Output spatial reference (outSR)—The output features will be projected into the output spatial reference.

{
"extent" : {extent},
"outSR" : {spatial reference}
}

f

The response format. The default response format is html.

Values: html | json | kmz

centralFeatureResultLayer

meanCenterResultLayer

medianCenterResultLayer

ellipseResultLayer

The output result.

Example:

{"url": 
"http://analysis.arcgis.com/arcgis/rest/services/tasks/gpserver/summarizecenteranddistribution/jobs/<jobId>/results/ellipseResultLayer"}

The result has properties for parameter name, data type, and value. The contents of value depends upon the OutputName parameter provided in the initial request.

• If OutputName was provided, value contains the url to the feature service layer.
  {
  "paramName":"ellipseResultLayer", 
  "dataType":"GPString",
  "value":{"url":"<arcgis featureservice layer url>"}
  }

• If OutputName was not provided, value contains a feature collection.
  {
  "paramName":"ellipseResultLayer",
  "dataType":"GPString",
  "value":{"featureCollection": ... }
  }

See Feature Output for more information about how the result layer or collection is accessed.