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Chapter: 11th Geography : Chapter 11 : Interpretation of Topographical Map

Open Series Maps

Survey of India (SOI) brings out two series of maps through the National Map Policy, 2005.

Open Series Maps

Survey of India (SOI) brings out two series of maps through the National Map Policy, 2005.

Defence Series Maps (DSMs) - These topographical maps (on Everest/WGS-84 Datum and Polyconic/UTM Projection) are on various scales (with heights, contours and full content without dilution of accuracy). These maps mainly cater for defence and national security requirements. This series of maps (in analogue or digital forms) for the entire country are classified by the Ministry of Defence.

Open Series Maps (OSMs) - OSMs are brought out exclusively by SOI, primarily for supporting development activities in the country. OSMs bear different map sheet numbers and are in UTM Projection on WGS-84 datum. Each of these OSMs (in both hard copy and digital form) become ‘Unrestricted’.




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