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A map showing the triangles and transects used in the Great Trigonometrical Survey (1802–1852), produced in 1870. Surveyor-General of India George Everest (b.1790-d.1866) under whom GTS was completed and Mount Everest was named in his honour.
In 1875, the decision was taken that the Survey budget should be reduced from 240,000 to 200,000 pounds. This resulted in a reorganization under Surveyor-General Colonel J.T. Walker to amalgamate the Great Trigonometrical, Topographical and Revenue Surveys into the Survey of India. [9] Survey towers used by George Everest to elevate the instruments
European maps become more accurate with the Age of Exploration and Portuguese India from the 16th century. The first modern maps were produced by the Survey of India, established in 1767 by the British East India Company. The Survey of India remains in continued existence as the official mapping authority of the Republic of India.
A topographic survey is typically based upon a systematic observation and published as a map series, made up of two or more map sheets that combine to form the whole map. A topographic map series uses a common specification that includes the range of cartographic symbols employed, as well as a standard geodetic framework that defines the map ...
This work has been released into the public domain by its author, Survey of India.This applies worldwide. In some countries this may not be legally possible; if so: Survey of India grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
While not officially "topographic" maps, the national surveys of other nations share many of the same features, and so they are often called "topographic maps." Existing topographic survey maps, because of their comprehensive and encyclopedic coverage, form the basis for much derived topographic work.
For a detailed map of all disputed regions in South Asia, see Image:India disputed areas map.svg Internal borders The borders of the state of Meghalaya, Assam and Arunachal Pradesh are shown as interpreted from the North-Eastern Areas (Reorganisation) Act, 1971, but has yet to be verified.
The Survey of India Service (SIS) is a cadre of the Government of India who prepare the Survey of India. In India, topographical map is published by the Survey of India.