Survey Department of Thailand

Survey Department of Thailand
Name	Survey Department of Thailand
Native name	กรมแผนที่ทหาร
Formed	1885
Jurisdiction	Kingdom of Thailand
Headquarters	Bangkok
Parent agency	Ministry of Interior (Thailand)

Survey Department of Thailand is the principal national agency responsible for national topographic mapping, geodetic control, cadastral reference, and geospatial information management in the Kingdom of Thailand. Established in the late 19th century, it provides foundational spatial data used by agencies such as Royal Thai Armed Forces, Department of Public Works and Town & Country Planning, Royal Irrigation Department, and international partners like United Nations and Asian Development Bank. The department supports activities ranging from land administration linked to the Land Code (Thailand) to infrastructure projects connected with Eastern Economic Corridor planning.

History

The agency traces its origins to 1885 during the reign of King Chulalongkorn (Rama V), formed to modernize state capacity and support reforms associated with the Bowring Treaty era and territorial consolidation after conflicts with French Indochina and British Empire. Early surveys responded to boundary issues culminating in agreements such as the Franco-Siamese Treaty of 1904 and later demarcations with neighboring states including Myanmar and Laos. Throughout the 20th century, the institution adapted to demands from projects like the Mae Klong Dam and wartime requirements during World War II when cartographic resources were critical for military logistics involving the Imperial Japanese Army. Post-war reconstruction, economic development under leaders such as Prime Minister Plaek Phibunsongkhram and later administrations drove expansion of national mapping programs and integration with global geodetic standards like the Global Positioning System and International Terrestrial Reference Frame initiatives.

Organization and Structure

The department is administratively placed under the Ministry of Interior (Thailand), organized into directorates handling geodesy, topographic mapping, cadastral control, hydrographic liaison, cartographic production, and geospatial data services. Leadership comprises a Director-General reporting to the minister, coordinating with entities such as the Royal Thai Survey Department (historical military survey offices), Royal Thai Police for forensic mapping, and the Office of the Prime Minister on strategic projects. Regional survey offices liaise with provincial authorities like those in Chiang Mai Province, Nakhon Ratchasima Province, and Songkhla Province to maintain bench marks and cadastral ties. The organizational model follows comparable structures found in agencies such as the Ordnance Survey and the United States Geological Survey.

Functions and Responsibilities

Primary functions include establishing and maintaining national geodetic networks tied to the World Geodetic System 1984, producing topographic maps at multiple scales used by ministries including Ministry of Transport (Thailand) and Ministry of Natural Resources and Environment (Thailand), and providing cadastral reference frames supporting the Land Department (Thailand). The department issues survey standards referenced by infrastructure projects like the Bangkok Mass Transit System, disaster response coordinated with the Department of Disaster Prevention and Mitigation (Thailand), and environmental monitoring linked to the National Park, Wildlife and Plant Conservation Department. It also supplies baseline data for academic research at institutions such as Chulalongkorn University, Kasetsart University, and the Asian Institute of Technology.

Mapping and Geospatial Products

The agency produces conventional 1:50,000 and 1:25,000 topographic maps, thematic products for watershed management in basins like the Chao Phraya River, and digital map layers compatible with standards from Open Geospatial Consortium. Products include orthophotos, digital elevation models used in flood modeling for events like the 2011 Thailand floods, and cadastral reference maps supporting titling under the Sor Por Kor (Land Reform) programs. Geoportals interoperate with platforms maintained by Geo-Informatics and Space Technology Development Agency and international datasets from NASA and European Space Agency for remote sensing fusion.

Technology and Survey Methods

Modern methods integrate GNSS networks, real-time kinematic (RTK) positioning, total station traversing, airborne LiDAR campaigns, and satellite remote sensing with sensors from programs like Landsat and Sentinel. The department implements geodetic control using continuously operating reference stations compatible with International GNSS Service practices and adopts photogrammetric workflows derived from standards used by agencies such as the National Geospatial-Intelligence Agency. Survey campaigns apply error budgeting aligned with ISO quality frameworks and coordinate transformation parameters to align legacy grids to contemporary datums.

Training and Research

Training programs for surveyors and cartographers are conducted in partnership with universities and vocational schools including King Mongkut's University of Technology Thonburi and Royal Thai Naval Academy. Curriculum covers geodesy, cadastral law tied to the Land Code (Thailand), photogrammetry, and GIS techniques. Research collaborations address coastal subsidence in the Gulf of Thailand, landslide susceptibility in the Tenasserim Hills, and precision agriculture applications with the Ministry of Agriculture and Cooperatives. Continuing professional development aligns with regional bodies like the ASEAN Coordinating Committee on Geospatial Information.

International Cooperation and Legal Framework

The department engages in bilateral boundary surveys with neighbors under instruments such as the Anglo-Siamese Convention legacy regimes and multilateral cooperation through United Nations Committee of Experts on Global Geospatial Information Management. Legal authorities derive from national statutes and regulations aligned with the Constitution of Thailand and sectoral laws affecting land titling, environmental assessment, and infrastructure. International partnerships include data sharing with GEBCO for marine charts, technical assistance from the Japan International Cooperation Agency, and participation in regional capacity-building via Asian Development Bank programs.

Category:Government agencies of Thailand