Why is all the info on the topology map required?

Topology/topographic maps are the maps that contain all the description and details about the human invented and natural components on the Earth like landscapes,etc.They give the realistic data along with the contour lines, structure etc.

The main purpose it contains the detailed information , because it is used in the professional field by the workers or experts and used for the three dimensional structure as the change in the landscapes and fields always persist  .It is also used for the recreational infrastructure which requires a accurate and precise detailing.

answer; availability;