This is an archive related to a previous version of Esri Maps for SharePoint. If you need the current version go to http://doc.arcgis.com/en/maps-for-sharepoint/.
Clustering can be applied to point layers that allow configuration of symbology. This includes ArcGIS Server feature layers, geoRSS layers, graphics layers, and SharePoint list layers. For more information on the different layer types and their capabilities, see Layer types.
When a layer contains a large number of point features, showing each feature individually on the map is often not useful. In this scenario, point features often overlap, making it difficult to distinguish between features. Even when they do not overlap, it is usually difficult or impossible to visually extract meaningful information when hundreds or thousands of points are shown all at once.
One approach to resolving this issue is to aggregate groups of point features into one symbol. This is called clustering. Within the ArcGIS Map Web Part, clustering will aggregate the points in a layer that are within a certain distance of one another on the screen. Since the clustering is dependent on screen distance, more points are aggregated into fewer groups as you zoom out. Conversely, points are divided into more and more groups as you zoom in. When you zoom in to a level where the clustering area around one point feature no longer contains any other features, that feature will not be clustered but rather will be shown in its location with the symbology specified by the layer's renderer.
To get started configuring clustering, complete the following steps:
The configuration controls in the Point Clustering group will be enabled.
Clusters that contain more features than the number specified here, such as the one with 65 features in the upper left corner of the image above, are not interactive.