Glossary for Geospatial Science

image map or georeferenced image map:  An image that has been processed to be like a map in appearance, scale, geometry, boundary, and projection with a degree of precision that satisfies the user.  Measurements made from an image map yield results equal to those made from the corresponding planimetric, topographic, or other map.  Similarly, either the image map or the conventional map can be overlaid and matched with the other.

For example, a 7.5' image map prepared in TNTmips from Landsat or SPOT satellite images will accurately match the corresponding USGS topographic map.  Similarly, the color scan of a topographic map that has been assembled by tiling and calibrated to map coordinates is an image map.  (See also: nominal image map.)