Who made the first map of India? The Survey of India and the Great Trigonometrical Survey
James Rennell’s "Map of Hindoostan" (1782), the Survey of India of 1767, the Great Trigonometrical Survey from 1802 and Radhanath Sikdar who computed Everest’s height.
Rohit Tandon · 8 October 2026 · 3 min read
Today we can see a map of the whole country on our phone with one finger. But two to two and a half centuries ago, making an accurate map of India was a huge scientific mission that took decades, in which thousands of people measured the land across forests, mountains and rivers. The answer to "Who made the first map of India?" lies in this story.
India on the maps of the ancient world
India is mentioned and roughly drawn even on very old maps. The "Geography" of the second-century Greek scholar Ptolemy had an approximate picture of India, but its shape and distances were quite wrong. Arab and Persian geographers also made maps of India.
The first fairly accurate map: James Rennell (1782)
The East India Company surveyor James Rennell was the first Surveyor General of Bengal. After years of surveying he published the "Map of Hindoostan" in 1782. It is regarded as the first fairly accurate map of the whole subcontinent, which is why Rennell is often called the "father of Indian geography".
The Survey of India (1767)
India's survey department — the Survey of India — was set up in 1767. It is one of the oldest scientific departments of the Government of India, and its headquarters today is in Dehradun. It prepares the country's official maps.
The Great Trigonometrical Survey (from 1802)
In 1802 William Lambton began an amazing project near Chennai (Madras) — the Great Trigonometrical Survey. It laid a network of big triangles across the land to measure distances and angles very precisely. Later George Everest took the work forward. The survey went on for decades and laid the foundation for accurate maps of India.
Did you know? Around 1852 the Bengali mathematician Radhanath Sikdar worked out from calculations that "Peak XV" was the highest peak in the world. In 1865 it was named "Mount Everest" after George Everest.
The challenges of the survey
Surveyors had to carry heavy instruments — such as the giant "theodolite" — on their shoulders up the mountains. Malaria, wild animals and bad weather cost many lives. In many places tall towers were built and the instruments placed on top, so that distant points could be seen.
How to learn to read a map
On every map, look for four things: the scale (how much distance on the ground 1 centimetre on the map stands for), the direction (the arrow pointing north), the legend (the symbols for roads, railways, rivers and cities) and the lines of latitude and longitude, which give the exact position of any place. India lies between 8° and 37° north latitude and between 68° and 97° east longitude.
Maps today
Today maps are made with satellites, GPS and drones. India has its own satellite navigation system, NavIC, and the Survey of India also provides digital maps. Under schemes such as "SVAMITVA", land in rural areas is being surveyed by drone. Yet all of this began with the surveyors who measured the country on foot.
Read more: Old names of India · Geography questions · Class 6 quiz.
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