The Great Trigonometrical Survey of India

The Great Trigonometrical Survey of India

© Royal Geographical Society

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Title:

The Great Trigonometrical Survey of India

 

Date:

1870

 
 

Origin:

-

 
 

Information:

The survey, which involved several thousand Indians and was named the Great Trigonometrical Survey in 1819 covered more than 1,600 miles. The survey was started by a British army officer, William Lambton in Madras, in 1802 and it took 40 years for it to reach the Himalayas. Lambton's measurement along the ground was known as triangulation.

It led to the most complex mathematical equations known to the pre-computer age, and led to the 'discovery' of the world's highest mountain.