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/.
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 create a heat map. A heat map represents the geographic density of point features on a map by using colored areas to represent those points. The areas will be largest where the most points are concentrated.
A new heat map layer appears in the Contents pane. The map automatically displays the heat map under the original points layer.