Great Trigonometrical Survey
The Great Trigonometrical Survey was a project which aimed to the entire Indian subcontinent with scientific precision. It was begun in 1802 by the British infantry officer William Lambton, under the auspices of the East India Company. Under the leadership of his successor, George Everest, the project was made the responsibility of the Survey of India. Everest was succeeded by Andrew Scott Waugh and after 1861 the project was led by James Walker, who oversaw its completion in 1871.

Among the many accomplishments of the Survey were the demarcation of the British territories in India and the measurement of the height of the Himalayan giants: Everest, K2, and Kanchenjunga. The Survey had an enormous scientific impact as well, being responsible for one of the first accurate measurements of a section of an arc of longitude, and for measurements of the geodesic anomaly which led to the development of the theories of isostasy.

The native surveyors made use of in the Himalayas, especially in Tibet (where Europeans were not allowed), were called pandits, who included the cousins Nain Singh Rawat and Krishna Singh Rawat.
Q60140
Indian subcontinent
LOC
Q2025514
British infantry
MEDIA
Q1899005
William Lambton
PER
Q83164
East India Company
Concept
Q217119
George Everest
PER
Q1359276
Survey of India
ORG
Q507301
Andrew Scott Waugh
PER
Q1681180
James Walker
PER
Q174193
British
LOC
Q668
India
LOC
Q5451
Himalaya
LOC
Q513
Everest
LOC
Q43512
K2
LOC
Q82019
Kanchenjunga
LOC
Q1259418
measurements
UNK
Q36477
longitude
Concept
Q159914
geodesic anomaly
UNK
Q188719
isostasy
Concept
Q17252
Tibet
LOC
Q2336535
pandit
Concept
Q1394526
Nain Singh Rawat
PER
Q1843054
Krishna Singh Rawat
PER
Q1548493
Great Trigonometrical Survey
LOC
1802-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1802
DATE
1861-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1861
DATE
1871-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1871
DATE
+2^^http://www.w3.org/2001/XMLSchema#decimal
2
NUMBER
operating area
country
highest point
part of
country
mountain range