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<p>Index to the <a href="https://en.wikipedia.org/wiki/Great_Trigonometrical_Survey" class="extiw" title="w:Great Trigonometrical Survey">Great Trigonometrical Survey of India</a> (1922). India is shown on a 1-degree grid of green lines. The blue triangles indicate the Great Trigonometrical <a href="https://en.wikipedia.org/wiki/triangulation" class="extiw" title="w:triangulation">w:triangulation</a> measurements. Triangulation series are indicated by a number in parentheses. These series are described in the table at the bottom left. The red dash-dot lines are <a href="https://en.wikipedia.org/wiki/History_of_longitude#Land_surveying_and_telegraphy%7C" class="extiw" title="w:History of longitude">telegraph longitude area</a>.
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Among the many accomplishments of the Survey were the demarcation of the British territories in India and the measurement of the height of the <a href="https://en.wikipedia.org/wiki/Himalaya" class="extiw" title="w:Himalaya">Himalayan</a> giants: <a href="https://en.wikipedia.org/wiki/Mount_Everest" class="extiw" title="w:Mount Everest">Everest</a>, <a href="https://en.wikipedia.org/wiki/K2" class="extiw" title="w:K2">K2</a>, and <a href="https://en.wikipedia.org/wiki/Kanchenjunga" class="extiw" title="w:Kanchenjunga">Kanchenjunga</a>.</div>
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Survey of India, Government of India</div>
1922
Report of the Survey of India for 1921–22