Word derives from mechanical sweep of cathode beam inside television tube and similar devices.
Becomes attached to resulting scan. Raster model directly implements space controlled measurement frameworks, but can represent other measurement frameworks as well. The 'geographical matrix' concept surfaces, but there are relationships it does not model. You don't need it, you don't understand what it's about, nor what it could be used for. It's not relevant to you and you can only store this information on your computer, hoping someday it may be relevant and go through a catharsis from data to information.