Vietnam: Mathematical basis in developing digital author copy

13:42, 10/07/2024

Recently, the Ministry of Natural Resources and Environment of Vietnam promulgated Circular 47/2014/TT-BTNMT on technical regulations on administrative maps of all levels, including the provisions on the mathematical basis in developing digital author copy.

Mathematical Basis for Creating Digital Author Maps, Circular 47/2014/TT-BTNMT

Vietnam: Mathematical basis in developing digital author copy (Illustration)

Under Article 21 of Circular 47/2014/TT-BTNMT, the mathematical basis development in Vietnam is specified as follows:

- Nationwide governmental administrative map

- Frame line: East and West frame lines are parallel to the prime meridian whereas the North and South frame lines are perpendicular to the prime meridian;

- Maps are divided into grids which are numbered with natural number from north to south, west to east;

- Nationwide governmental administrative maps shall cover 2 degrees of longitude and 20 degrees of latitude regardless of scale;

- 2 to 4 national coordinates and elevation points are included in a geographical region of the map; these coordinates and elevation points can be left out in nationwide administrative maps of 1:3.500.000 scale;

- Specify scale and scale indicator of maps.

- Provincial-level, district-level governmental administrative maps

- Frame line: East and West frame lines are parallel to the prime meridian whereas the North and South frame lines are perpendicular to the prime meridian;

- Maps are divided into grids which are numbered with natural number from north to south, west to east;

- Longitude to latitude density of provincial-level, district-level governmental administrative maps is specified under Schedule 1:

Schedule 1

Map scale	Longitude to latitude density
1:2.000 - 1:5.000	2′ x 2′
1:6.000 - 1:25.000	5′ x 5′
1:26.000 - 1:80.000	10′ x 10′
1:81.000 - 1:150.000	20′ x 20′

- 2 to 4 national coordinates and elevation points are included in the main administrative division of the map;

- Specify scale and scale indicator of maps.

- Atlases of governmental administrative maps and other administrative maps

- Mathematical basis including: Longitude and latitude grid and note, scale or scale indicator, frame line;

- Depending on the purpose of the map, dimensions of longitude and latitude grid can be rounded to the degree or minute accordingly.

More details can be found in Circular 47/2014/TT-BTNMT effective from August 22, 2014.

Thuy Tram

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