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A toposheet just indicated by a number is known as a base map. How much latitude and longitude does it cover?
It is useful because it can directly give you the scale of the map.For example , a toposheet numbered as 45 represents a base map, which has a scale of 1:1000000.
A toposheet just indicated by a number is known as a base map. How much latitude and longitude does it cover?
It is useful because it can directly give you the scale of the map.For example , a toposheet numbered as 45 represents a base map, which has a scale of 1:1000000.
What does a toposheet numbered 45 D mean?What is the scale of such a toposheet?
Whenvever a letter is added to a number , it means that the base map has been sub-divided into smaller sections, each representing a section covering 1 degree lat and 1 degree long. Scale of such a toposheet is 1:250000.
When a topsheet is numbered 45 D/NW , what does it mean? What is the scale of this map?
It means the section 45 D has been subdivided into even smaller sections, on the basis of directions. Here the scale is 1:100000.
45 D /16
when a number is added beneath a letter, it means that the section 45 D has been sub-divided into 16 smaller sections.
Here the scale is 1:50000.
45 D/16/NW
It means the section 45 D has been subdivided into even smaller sections, on the basis of directions. Here the scale is 1:25,000.
Note 
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