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Royal Thai Survey Department is the main organization that sets Geodesy bench mark networks for both private and government sectors to use as the points of control and references for their survey.

Horizontal Control Point NetworksHorizontal Bench Mark Networks are GPS satellite network which are referred to WGS84 (ITRF 2000) classified into 3 types

1. Reference Network, which consists of 8 points

2. Primary Network, which consists of 11 points

3. Secondary Network, which consists of 75 points

Vertical Control Point NetworksVertical Control Point Networks are the primary control which are referred to mean sea level (Lak Island) which can be classified into 2 parts

1. The network on the upper part of Lak Island

2. The network on the lower part of Lak Island

 

Land Subsidence SurveyRTSD supports Office of Natural Resources and Environmental Policy and Planning’s surveys on land subsidence. RTSD has continually been carrying out the land subsidence survey of Bangkok and its vanity since 1978 by mean of the primary level of survey.

Gravity Control Point NetworksGravity Bench Mark Network is referred to control point of International Gravity Networks, which consists of 93 pins.

Magnetic Repeat StationsThis Magnetic Network is composed of 29 repeat stations. A measurement of a magnetic field can be conducted independently and in order to measure the Earth’s magnetic field, the values of magnetic deviation, tilt angle and total field intensity have to be considered.