Union Task Activity


Uses the ArcGIS Geometry Service to union a collection of graphics.

Inheritance Hierarchy:



This activity unions a set of geometries and then returns the resulting geometry (the union of all the geometries in the input collection).

In a Workflow:

A Union activity could be used after performing Buffer Geometry activity on features in separate layers. The union activity would then be used to combine the 2 areas of the separate buffers into a single geometry.


Name Description

In Arguments


The network credentials that are sent to the host and used to authenticate the request.

Custom Parameters

Additional parameters to include in the request.

Disable Client Caching

If true, adds a timestamp parameter (_ts) to the request to prevent it from being loaded from the application's cache.

Feature Set

The FeatureSet for which all features' geometry will be unioned. A collection of points, multipoints, polylines or polygons. The input types cannot be mixed.

Geometry service Url

The URL of the ArcGIS Server Geometry service. For example: http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Geometry/GeometryServer.

Proxy Url

The URL to proxy the request through.


The token for accessing a secure ArcGIS task.


Display Name


You can change the name of an activity to one that describes what it does. A descriptive name can make a workflow easier to interpret and maintain.

Out Arguments


The Esri geometry resulting from the union task.

Version Information:

Supported from: Geocortex Essentials 3.4.