Modern mapping of the Kingdom of Tonga was established
in the decade after the islands gained independence from
Britain in 1970. 1:25,000 scale coverage in 23 sheets was
compiled by the Directorate of Overseas Surveys (DOS), (now
Ordnance Survey International (OSI)). These line maps
were on the Transverse Mercator projection, International
ellipsoid, used the UTM grid and plotted relief with 10 m
contour intervals. Other DOS coverage included 1:50,000
scale full-color photo maps of Tongatapu island. The
Tonga Ministry of Lands Survey and Natural Resources
(TMLSNR) acts as the national surveying authority and
maintains some larger scale mapping, including a 1:2,500
scale map of the capital Nuku'alofa. Small scale coverage
includes a 1:1,000,000 scale map of the group first published
in 1969, a monochrome copy of DOS mapping republished at 1:900,000 by the Hawaii Geographical
Society (HGS) and a map of the islands from Pacific Maps.
Soviet military topographic mapping of Tonga exists at the following scale: 1:1,000,000 (5 sheets, complete coverage, published 1965-1973). This product is available in print,
digital raster and digital vector GIS formats from East View Geospatial.
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