GIS a graphic representation or description of an object, typically produced by an optical or electronic device —note 1. an image consists of remotely sensed data such as satellite data, scanned data, and photographs —see remote sensing —note 2. an image is stored as a raster data set of binary or integer values that represent the intensity of reflected light, heat, or another range of values on the electromagnetic spectrum —note 3. remotely sensed images are photographic or digital representations of the earth This definition last updated 10/29/2008