A topographic map is called either large scale, intermediate scale, or small scale by the use of the following criteria:

Large scale: 1 inch= 100 feet or less

Intermediate scale: any scale from 1 inch= 100 feet to 1 inch= 1,000 feet

Small scale: 1 inch= 1,000 feet or more.

The designated contour interval varies with the purpose and scale of the map and the character of the terrain. Table 8-1 shows the recommended contour intervals that you may use to prepare a topographic map.