First of all, terrain modulation is reduced to a certain proportion according to the terrain characteristics and the terrain that can reproduce military operations.
Let it be a complete map to meet the needs of military operations. It requires that the real topographic relief on the topographic map should be significant enough, which is called "modulation".
Secondly, topographic profile is also an important part, which can clearly show others the topographic features, key topographic positions and complex topographic components of military operations, such as rivers, lakes, mountains and deserts. Finally, terrain identification shows terrain details, such as terrain type, groundwater level, irrigation and drainage capacity, topography and so on, which are also the contents of terrain identification.
Generally speaking, the method of military terrain modulation sketch mainly includes three parts: terrain modulation, terrain overview and terrain recognition. Their role is to show the characteristics of the terrain in military operations and the composition of complex terrain, reduce the scale of the terrain in military operations, and achieve the purpose of actual operations.