The defined dimensional relationship between reality and the map is called scale .
Maps portray only the information that's been chosen to fit the use of the map.
Classification and simplification make data easier to understand. The selection and design of these symbols greatly effects the communicability of the map. Based on cells or pixels makes model ideal for dealing with data that vary continuously across a surface temp. Reclassify objects having certain combinations of attributes. Latitude - Latitude runs from 0 at the equator to 90 N or 90 S at the poles.