GEOG 863
GIS Mashups for Geospatial Professionals

4.4.1 TileLayer

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Description:

  • displays a full dataset using a series of adjacent tiles (smaller individual images that you can think of as snapshots of the complete map)
  • a different set of tiles is created for each level of detail (zoom level)
  • referred to as a cached service because the tiles are pre-created (i.e, not dynamically at the time the request for the layer is received by the server)
  • can show data from many different underlying datasets at once
  • often used as a basemap; in fact, most of the options when setting a Map’s basemap property result in the addition of a TileLayer
  • changes in the underlying data cause the service to be out of date, so this layer type is best suited to data that changes infrequently
  • tile creation can be a time consuming process; often automated to run overnight
  • because you’re dealing with a picture of your data, you can’t implement popup windows
  • can create your own using ArcMap or ArcGIS Pro (see GEOG 865)

How do I know I’m dealing with a TileLayer?

  • labeled as a MapServer service in the REST Services Directory
  • the service’s Single Fused Map Cache property will be true and it will have a Tile Info section

Class description in the SDK:

Example service:

Code sample: