A further $16$ subtypes of each degree map are provided for the purpose of showing more details of regions more accurately. The number given in the map according to this method is called the "indicator number" of the map.
Two methods are used to show the elevation of the surface in a place description map.
Pictorial methods can give an idea of the general landscape of the whole country. Whereas in mathematical method the height of any one point can be known
In the place elevation system, a small point is indicated and a height is written next to it which is called "place elevation".