GIS Dictionary

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  1. [visualization] A foundational layer on a map that is the basis of GIS visual and geographic context. A basemap may include background reference information such as landforms, roads, landmarks, and administrative boundaries. It displays below any other layers and is typically excluded from the legend. A basemap is used for locational or spatial data reference.
  2. [data analysis] A map to which GIS data layers are registered and rescaled.
  3. [map design] In imagery, a collection of geometrically correct imagery used as the backdrop for GIS layers.

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