The Great Trigonometrical Survey of India was one of the most noteworthy contributions that the British made to India. Nobody had mapped so much of the Earth’s surface before this project. Among many of its remarkable achievements, it helped identify the world’s tallest peak! And Chennai is where it all started…

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Image Attributions:

1. Mount Everest: By Mount_Everest_as_seen_from_Drukair2.jpg: shrimpo1967derivative work: Papa Lima Whiskey 2 (talk) This file was derived from: Mount Everest as seen from Drukair2.jpg:, CC BYSA 2.0, https://commons.wikimedia.org/w/index...

2. Index Chart of the Great Trigonometric Survey of India: By Survey of India Survey of India, Public Domain, https://commons.wikimedia.org/w/index...

3. Plan of Lambton's Trigonometrical Survey: By Survey of India Survey of India (https://zenodo.org/record/3596441#.YQ..., Public Domain, https://commons.wikimedia.org/w/index...

4. Map of Ancient India: By Alain Manesson Mallet http://www.columbia.edu/itc/mealac/pr..., Public Domain, https://commons.wikimedia.org/w/index...

5. India Map, 1603: By Abraham Ortelius http://www.columbia.edu/itc/mealac/pr..., Public Domain, https://commons.wikimedia.org/w/index...

6. Portuguese Map of India: By Jeronimo de Ataide, João Teixeira Taboas geraes de toda a navegação, Public Domain, https://commons.wikimedia.org/w/index...

7. William Lambton: By William Havell (1782–1857) https://artuk.org/discover/artworks/l..., Public Domain, https://commons.wikimedia.org/w/index...

8. General Plan of Triangulation: By William Lambton Lambton, William (1811). "An account of the Trigonometrical Operations in crossing the peninsula of India, and connecting Fort St. George with Mangalore". Asiatic Researches; or Transactions of the Society Instituted in Bengal for inquiring into the History and Antiquities: 290384., Public Domain, https://commons.wikimedia.org/w/index...

9. Index to the Great Trigonometrical Survey, 1922: By Survey of India, Government of India Report of the Survey of India for 1921–22, Public Domain, https://commons.wikimedia.org/w/index...

10. Calcutta Baseline: By Sketch by James Prinsep Reprint in Historical records of the survey of India. Volume 4. 18301843 by R.H. Phillimore. (1954), Public Domain, https://commons.wikimedia.org/w/index...

11. Nolji Tower: By C D Simons A sketch of the geography and geology of the Himalaya Mountains and Tibet Part I, Public Domain, https://commons.wikimedia.org/w/index...

12. GTS Ridge Stone, Karnataka: By Vinay Bhat Own work, CC BYSA 4.0, https://commons.wikimedia.org/w/index...

13. GTS Tower, Gopegarh: By Tirtha Tanay Mandal Own work, CC BYSA 4.0, https://commons.wikimedia.org/w/index...

14. GTS Tower, Paikpara: By Indrajit Das Own work, CC BYSA 4.0, https://commons.wikimedia.org/w/index...

15. Bangalore Baseline: By L. Shyamal Own work, CC BYSA 3.0,
https://commons.wikimedia.org/w/index...

16. Mount Everest: By Rdevany This is a digital photograph that I took, CC BYSA 3.0, https://commons.wikimedia.org/w/index...

17. Oblate Spheroid: CC BYSA 3.0, https://commons.wikimedia.org/w/index...

18. George Everest: By Maull & Polyblank https://media.gettyimages.com/photos/..., Public Domain, https://commons.wikimedia.org/w/index...

19. Notes from A.S. Waugh: By Andrew Waugh "Papers relating to the Himalaya and Mount Everest" in Proceedings of the Royal Geographical Society of London, Vol. I (1857), p. 346, Public Domain, https://commons.wikimedia.org/w/index...

20. Everest from Darjeeling: By Bourne & Shepherd http://hdl.handle.net/1887.1/item:925852, CC BY 4.0, https://commons.wikimedia.org/w/index...

21. Radhanath Sikdar stamp: By Subashini.G Own work, CC BYSA 4.0, https://commons.wikimedia.org/w/index...