Difference
- URL:https://<geometryservice-url>/difference
- 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 Example |
| 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 Example |
| 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:
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
{
"geometryType": "<esriGeometryPoint | esriGeometryMultipoint | esriGeometryPolyline | esriGeometryPolygon >",
"geometries": [<geometry1>, <geometry2>]
}
JSON Response example
{
"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": []
}
]
}