[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.
[data analysis]
A map to which GIS data layers are registered and rescaled.
[map design]
In imagery, a collection of geometrically correct imagery used as the backdrop for GIS layers.