Topographical Sheets

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A topographic sheet is a large-scale map that provides complete information about both physical elements (mountains, rivers, plains, lakes) and cultural elements (settlements, agriculture, transport r…

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The Survey of India prepares topographic sheets in India. It is located in Uttarakhand.

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In the first stage, areas spanning 4° latitudes and 4° longitudes of India are covered in each toposheet. The scale was 1:1,000,000 and these sheets are numbered 1, 2, 3, 4, etc.

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In the second stage, every map from the first stage is divided into 16 parts. Each division covers 1° latitude and 1° longitude. Every division is named from A to P according to English alphabet, writ…

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In the third stage, each map from stage two is divided into 16 parts. Each subdivision covers 15' latitude and 15' longitude, numbered 1 to 16. This creates 256 maps for every degree sheet. Earlier, t…

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The Index Number is the unique identification number given to toposheets based on the three-stage division system. It helps identify the exact location and coverage of a particular toposheet. For exam…

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The four main points for interpretation are: 1. Marginal Information - general information about the map, 2. Physical Features - relief, drainage, vegetation, 3. Cultural Features - settlements, trans…

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Marginal Information includes: Index Number of the map, main and sub-divisions of the area, survey and publication year, latitudinal and longitudinal extent, magnetic declination, unit showing altitud…