# How are Toposheets numbered?

## How are Toposheets numbered?

Standard topographic maps are numbered using a system developed for the International Map of the World. Map areas at 1:1 million scale are identified by a two letter combination which identifies the hemisphere and a four degree band of latitude and a two digit number which identifies a six degree band of longitude.

How many Toposheets are there?

requirement of all the engineering groups. ✓ We are having 3460 topo sheets .

What are the types of Toposheets?

Toposheets classified according to scale:

• Large scale maps: Scale 1 in 1000 or less than 1000.
• Medium scale maps: Scale from 1 in 1000 to 1 in 10000.
• Small scale maps: Scale 1 in 10000 or greater than 10000.

### What do the numbers on a topography mean?

Contour elevation numbers indicate the direction of elevation by always reading (pointing) uphill. What is scale? Maps are made to scale. In each case, the scale represents the ratio of a distance on the map to the actual distance on the ground.

How many Toposheets are there in India?

India is covered by nearly 385 toposheets on 1:2,50,000 scale and these are also called as Degree Sheets. Each Degree sheet has 16 top0osheets of 1:50,000 scale and at present the whole of the country is covered by 1:50,000 rigorous metric surveys in more than 5000 toposheets.

How do you read numbers on a map?

The numbers going across the map from left to right are called eastings, and go up in value eastwards, and the numbers going up the map from bottom to top are called northings, because they go up in a northward direction.

#### What are million sheets?

Million sheets India and the adjoining countries are divided into 40 x 40 sheets. These sheets are called the million sheets. The extent of each million sheet is 40 of latitudes and 40 of longitudes. Thus, they are also called 40 x 40 sheets.

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