Subsérie QW/12/4 - Maps of Thailand

The Royal Thai Survey Department was a Special Services Group of the Royal Thai Armed Forces tasked to conduct land and aerial surveys, geodesy and geophysics works in Thailand. It was officialyl established in 1885, in the reign of King Rama V. In the first period, it engaged in cadastral survey, which is the survey of specific land parcels to define ownership for land registration, and for equitable taxation.