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Thailand is almost unique in having not only almost complete high-quality aeromagnetic and radiometric coverage of its land area, but in making the maps widely available via the website of the Department of Mineral Resources (DMR). The surveys were flown in the period from 1984 to 1989 by Kenting Earth Sciences for the DMR (Tulyatid & Fairhead 1999). The postings include maps of total magnetic intensity after correction for the regional background (the International Geomagnetic Reference Field or IGRF), of total gamma ray count and of count levels in the ‘thorium’ and ‘uranium’ channels. Thorium, uranium and also potassium sources can be discriminated on the basis of the energy of the gamma-rays produced, and surface-layer concentrations can be estimated once the data have been corrected for cosmic rays and overlapping radiation peaks from other sources. A Ternary or ‘false colour’ map, in which the potassium, uranium and thorium counts determine the relative intensities of the primary colours, is also posted.

Gravity coverage is less uniform. Regional data have been obtained by a number of organizations, and some of the processed results have been filed with the Bureau Gravimeetrique International in Toulouse. A somewhat more comprehensive database has been established by the Royal Thai Survey Department (RTSD) in order to define the geoid. This surface, defined as the gravity equi-potential that at sea coincides with mean sea level, provides the surveyor’s reference surface inland. More detailed work by other organizations has been concentrated in the sedimentary basins,

Gravity coverage

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