Difference

URL:: https://<root>/Utilities/Geometry/GeometryServer/difference
Methods:: GET
Version Introduced:: 10.0

Description

The difference operation is performed on a geometry service resource. This operation constructs the set-theoretic difference between each element of an array of geometries and another geometry, the so-called difference geometry. In other words, let B be the difference geometry. For each geometry, A, in the input geometry array, it constructs A - B. This operation calls simplify on the input geometries and geometry values. You can provide arguments to the difference operation as query parameters defined in the following parameters table.

Request parameters

Parameter	Details
`geometries`	Specifies an array of points, multipoints, polylines, or polygons. The structure of each geometry in the array is the same as the structure of the JSON geometry objects returned by ArcGIS REST API. Syntax Use dark colors for code blocksCopy `1 {"geometryType": "<esriGeometryPoint \| esriGeometryMultipoint \| esriGeometryPolyline \| esriGeometryPolygon >","geometries" : [ <geometry1>, <geometry2> ]}` Example Use dark colors for code blocksCopy `1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 { "geometryType": "esriGeometryPolyline", "geometries": [ { "paths": [ [[-117,34],[-116,34],[-117,33]], [[-115,44],[-114,43],[-115,43]] ] }, { "paths": [ [[32.49,17.83],[31.96,17.59],[30.87,17.01],[30.11,16.86]] ] } ] }`
`geometry`	Specifies a single geometry of any type and of a dimension equal to or greater than the `geometries` elements. The structure of the geometry is the same as the structure of the JSON geometry objects returned by ArcGIS REST API. The use of simple syntax is not supported. Syntax Use dark colors for code blocksCopy `1 {"geometryType": "<esriGeometryPoint \| esriGeometryPolyline \| esriGeometryPolygon \| esriGeometryMultipoint>","geometry": <geometry1> }` Example Use dark colors for code blocksCopy `1 2 3 4 5 6 7 8 9 { "geometryType": "esriGeometryPolygon", "geometry": { "rings": [ [[-117,34],[-116,34],[-117,33],[-117,34]], [[-115,44],[-114,43],[-115,43],[-115,44]] ] } }`
`sr`	Specifies the well-known ID (WKID) of the spatial reference or a spatial reference JSON object for the input `geometries` values. For a list of valid WKID values, see Using spatial references.
`f`	The response format. The default response format is `html`. Values: `html` \| `json` \| `pjson`

Example usage

The following is a sample request URL for difference that constructs the difference between polygons:

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https://sampleserver6.arcgisonline.com/arcgis/rest/services/Utilities/Geometry/GeometryServer/difference?sr=4269&geometries={"geometryType":"esriGeometryPolygon","geometries":[{"rings":[[[-75.5,39.7],[-74.7,40.2],[-74.9,39.2],[-75.1,39.1],[-75.5,39.7]]]},{"rings":[[[-75,39.8],[-74,40],[-74.5,39],[-75,39.8]]]}]}&geometry={"geometryType":"esriGeometryPolygon","geometry":{"rings":[[[-75,39.8],[-74,40],[-74.5,39],[-75,39.8]]]}}&f=pjson

JSON Response syntax

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{
  "geometryType": "<esriGeometryPoint | esriGeometryMultipoint | esriGeometryPolyline | esriGeometryPolygon >",
  "geometries": [<geometry1>, <geometry2>]
}

JSON Response example

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{
  "geometryType": "esriGeometryPolygon",
  "geometries": [
    {
      "rings": [
        [
          [
            -74.899999999999977,
            39.200000000000045
          ],
          [
            -75.099999999999966,
            39.10000000000008
          ],
          [
            -75.499999999999943,
            39.700000000000045
          ],
          [
            -74.699999999999989,
            40.200000000000045
          ],
          [
            -74.770833332999985,
            39.84583333300003
          ],
          [
            -74.999999999999943,
            39.800000000000068
          ],
          [
            -74.833333332999985,
            39.53333333300003
          ],
          [
            -74.899999999999977,
            39.200000000000045
          ]
        ]
      ]
    },
    {
      "rings": []
    }
  ]
}