ackenzie's map, showing the impact of the Treaty of Mysore (1799), was published in Beatson's 'A view of the Origin and Conduct of the war with the Late Tippo Sultaun.' (1800). The Key identifies land acquired by the British (red); the Nizam (yellow); the Marathas (brown) and the Rajah of Mysore (blue), all formerly part of Tipu's domains. To the Northwest, the area from the R.Kistna southwards to the Tungabhadra River was ceded to the Mahrattas. A corridor between Adoni and Koppal, and a larger area betwen Kurnool, Gooty and Cuddapa was ceded to the Nizam; the Company acquired the Baramahal and Salem; Dindigul at the southern tip of Mysore, and Coorg and Malabar west of the Ghats. After the Treaty of Mysore in 1799, the Marathas were offered Soonda and Harpanelly (although these were subseuently shared by the East India Company and the Nizam).

Accurate maps and surveys were essential for the British military machine. In Scotland, the artist Paul Sandby was appointed official draftsman to survey the mainland after the Jacobite attempts to regain the crown. In India, systematical surveying began only towards the end of the 18 century.

Colin Mackenzie, from the outer Hebrides, arrived in India in 1783, and served with the Madras Engineers from 1782 to 1821. His first surveys were in dindigul, Nellore and Guntur, and in 1792, he was sent to survey Cuddapah and Kurnool, ceded by Mysore to the Nizam. After a military expedition to Ceylon in 1792, Mackenzie returned to survey the Deccan, and continued there until 1799. After the death of Tipu, he was responsible for co-ordinating the Survey of Mysore (1799-1809). These surveys covered not only the topography of an area, but also its climate, soil, customs and traditions, agriculture and industry, and Mackenzie made and collected drawings of the topography and antiquities of South India to illustrate his work.

Some of the practical difficulties encountered by Mackenzie and his fellow surveyors are described in a letter, possibly by Major Dirom, who wrote in: 'It has often astonished me tht the government had never thought of sending an Engineer or some person for the purpose of surveying this peninsula, so little know to the World. The Peramubulator being out of order, the Major requested that I put it right and take charge...so that I would have it in my power to make a Map or Chart of the country which will answer well for Military Operations.'