Tamil Nadu News

Great Trigonometrical Survey Stations

November 15 , 2026 6 hrs 0 min 9 0

The Tamil Nadu Department of Survey and Settlement and the Tamil Nadu State Department of Archaeology have documented the Great Trigonometrical Survey (GTS) stations in the State and published the details in five volumes.
The Great Trigonometrical Survey was launched by Colonel William Lambton at St. Thomas Mount, Chennai, on April 10, 1802, during British rule.
The survey continued for 70 years, until 1871, using theodolite instruments to measure geographical locations.
Several GTS stations were established across India, including Tamil Nadu, and they are under the jurisdiction of the Survey of India.
The five volumes contain details of the identified stations, their surveys and geographical coordinates.
The documentation aims to preserve these historical stations and support future modern surveying activities in Tamil Nadu.