A Map is a representation of a part
or whole of the earth’s surface on a two dimensional surface. A map is a good
guide, but it requires some skill on the part of the map user to follow the
direction and information given by it. Map reading in actually, denotes the
formation of the visual picture of the ground depicted on a map. It requires
good deal of practice. The best way to familiarise once self with the
topography of a region is to compare the topographic map of the region with the
actually area depicted through a field visit called ground truthing. It is not
possible for anyone in their life time to collect direct information about the
whole earth but the student can get a large amount of information about the
earth from the topographic sheet or from these maps.
Topographical map commonly known as topo
sheets, are special maps
prepared by survey department that show a three-dimensional surface on a
two-dimensional sheet of paper. In India the topographic sheets for the whole
country are prepared by an organisation called as the ‘Survey of India’ (SOI).
The sheets are prepared largely on a scale of 1:50,000. Maps on scale of 1:
25,000, 1: 250,000 and 1:1,000,000 or million sheets are also prepared.