The national mapping agency in Thailand is the Royal Thai
Survey Department (RTSD). It was founded in 1885 and
is responsible for ground and aerial surveys, for the production
of topographic and thematic maps, and for geodetic and
geophysical surveys of the country. The first modern base
mapping of the country was a 1,161-sheet 1:50,000 scale
map, (Series L 708), produced in the 1950s under a joint
mapping agreement with the United States, which was
compiled using photogrammetric methods and covered all
the country north of latitude 7° N. This map was recast as
(Series L7117) from 1964 to give 772 quarter-degree sheets
by 1973; 58 border sheets in other series have been added
for complete coverage of Thailand in 830 sheets. This multi-color
map is bilingual, uses the UTM projection and grid,
Everest ellipsoid, and shows relief with 20 m contours. A
continuous revision program is in operation, using aerial
photographs and SPOT imagery, and since 1993 an automated
mapping system has been used to capture 1:50,000
scale data, which allows faster map production
and provides basic topographic data for national GIS development.
Up to 100 sheets a year are being converted.
1:250,000 scale mapping was compiled between 1969 and
1973 as part of the Joint Operations Graphic (JOG) series, covering
the country in 52 bilingual sheets. The civilian version of
this map is (Series 1501S). Two other larger scales: a 1:25,000 scale base map (Series L 8019) was started in 1971, to cover
development areas with 10 m contoured mapping, and about
350 sheets are maintained, while 1:12,500 scale coverage
is compiled for areas around 160 primary and secondary
Soviet military topographic mapping of Thailand is available at the following scales: 1:1,000,000 (9 sheets, complete coverage, published 1960-1985);
1:500,000 (23 sheets, complete coverage, published 1964-1992); 1:200,000 (105 sheets, complete coverage, published 1963-1985); 1:100,000 (338 sheets, complete coverage,
published 1968-1991) and a city (1:25,000) topographic map of Bangkok published in 1981. These products are available in print, digital raster and digital vector GIS
formats from East View Geospatial.
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