Measurement of Coordinates and Elevation of Commune-level Administrative Boundary Markers as Regulated

Surveying coordinates and elevation of administrative boundary markers at the commune level as stipulated by law (Illustrative photo)

Circular 48/2014/TT-BTNMT stipulates that coordinates and elevations of administrative boundary markers at the commune level are directly surveyed in the field using common surveying equipment such as GPS receivers and electronic total stations. The control points for coordinates and elevations used for initialization are state coordinate and elevation points within the survey area. When using GPS technology, the observation time must be selected according to the distance from the control points to the administrative boundary markers that need coordinates but must not be less than 60 minutes. The calculation process for surveying coordinates and elevations of administrative boundary markers at the commune level is as follows:

- The adjustment process to determine coordinates and elevations of administrative boundary markers is carried out similarly to the adjustment process of coordinate control networks at various levels. The coordinates of the commune-level administrative boundary markers are adjusted in the VN-2000 System, with a 3° projection fitting the central meridian of the topographic map used as the basis for establishing the administrative boundary map of the commune area.- The mean square error of the coordinates and elevations of the commune-level administrative boundary markers after adjustment must not exceed 0.3m for the horizontal plane and 0.5m for the elevation. In concealed or difficult areas, these errors are allowed to increase to 0.5m for the horizontal plane and 0.7m for the elevation;- After the adjustment calculations, a Confirmation Table of commune-level administrative boundary marker coordinates must be prepared, with the coordinates and elevation values noted to 0.01m as per the template specified in Appendix 04 issued with this Circular.

For more details, see Circular 48/2014/TT-BTNMT effective from November 3, 2014.

Ty Na

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