What contents must the Vietnam map show according to the current national topographic map regulations?
- How is the content of Vietnam map at 1:10,000, 1:25,000 scale shown?
- What are the content elements that must be presented in parallel with the southern frame of Vietnam map?
- How is the position of the center of the map symbol of Vietnam specified?
- What is the principle of showing the names of geographical objects on the Vietnam map?
How is the content of Vietnam map at 1:10,000, 1:25,000 scale shown?
Pursuant to Clause 1, Article 8 of Circular 12/2020/TT-BTNMT stipulating the content of national topographic maps at the scale 1:10,000, 1:25,000 as follows:
- Indicated by the symbol according to the scale when the linear features have a width of 5.0 m or more at the scale of 1:10,000 and 12.5 m or more at the scale of 1:25,000; for geographical features in the form of regions, the principle of showing by symbols according to the scale is specified in detail according to each group of map data;
- Shown by the symbol half according to the scale when the linear features have a width of less than 5.0 m for the scale 1:10,000 and less than 12.5 m for the scale of 1:25,000;
- Represented by non-scale symbols for geographical features that cannot be drawn to scale or when it is necessary to add a symbolic symbol placed in the middle of the scale symbol to increase the visualization of the map;
- Shown by explanatory notes when the geographical features do not have common symbols or describe the properties of the feature. Geographical objects that do not have symbolic symbols must make notes in accordance with the provisions of Appendix 3 issued with this Circular.
What are the content elements that must be presented in parallel with the southern frame of Vietnam map?
Pursuant to Clause 2, Article 8 of Circular 12/2020/TT-BTNMT stipulating that the content elements must be presented in parallel with the southern frame of the map of Vietnam, including:
- Unscaled symbols except for non-scale house symbols and symbols representing related geographical features;
- The name of the population, the name of the administrative unit;
- Note the elevation of the elevation point, note the height of the feature, the notes of the featured description;
- Names of features and explanatory notes;
- Symbols represent the distribution of vegetation and soil matter.
Note: The symbols and other notes are arranged in the direction of the feature, the letters and numbers are facing up. Note the altitude, the level line, the number must point towards the higher elevation and up. Notes that cannot be arranged in the direction of the terrain can be arranged parallel to the southern frame of the map.
Map of Vietnam: What are the regulations on displaying the content of the national topographic map according to current laws?
How is the position of the center of the map symbol of Vietnam specified?
Pursuant to Clause 4, Article 8 of Circular 12/2020/TT-BTNMT stipulating the position of the center of Vietnam map symbols is shown as follows:
- Symbols have basic geometry: the symbol center is the center of those basic shapes;
- Symbols with a bottom line: the center of the symbol is the midpoint of the bottom line;
- Symbols with square feet or dots, circles at the feet: the center of the symbol is the top of the right angle at the foot or the center of the dot at the foot;
- Empty symbol: the center of the symbol is in the middle of the legs;
- Linear symbol: the center of the symbol is the center axis of the symbol.
Note:
- When using a symbol to accurately represent the location of a geographical feature, the center of the symbol must coincide with the center of the object.
- When many geographical features are close together, it is required to accurately and accurately represent the geographical features with higher priority and the geographical features with higher azimuth significance. Features with lower priority show a break or give focus. Specify the priority of geographical features when shown on national topographic maps at scale 1:10,000 and 1:25,000, specifically as follows:
+ For independent geographical objects, priority shall be given in the following order: national measurement points; geographical objects have higher azimuth meaning, more solid material;
+ For linear geographical features, priority is given in the following order: railways, roads (from highways, national highways to provincial roads, district roads, other roads), water coastlines, land use boundaries land use, vegetation boundaries;
+ In special cases, it is allowed to move the symbol by 0.2 mm on the map but must ensure compliance with the priority of geographical features.
What is the principle of showing the names of geographical objects on the Vietnam map?
Pursuant to Clause 9, Article 8 of Circular 12/2020/TT-BTNMT stipulating the principle of expressing the names of geographical features on the map of Vietnam as follows:
- Show the name according to the name already in the place name database;
- When the name is not available or has changed compared to the database of place names, it must be investigated and collected according to legal documents of the competent authority and verified in the field. In the metadata file these locations are recorded as non-normalized.
- For areas with dense density, it is allowed to reduce the font size to 2/3 of the font size specified in the symbol;
- When displaying the names of geographical objects, priority is given to the names of large, important, famous or directional objects. Where the tolerance of the map does not allow to fully represent the names of the geographical features specified in Articles 10, 11, Article 12, Article 13, Article 14, Article 15 of this Circular, or If fully expressed, the note word affects other content and the readability of the map, the common noun abbreviation can be used. Common noun abbreviations are only used for geographical features that do not have a common symbol. Abbreviations common nouns comply with the provisions in Appendix 3 issued with this Circular.
- Geographical features have a wide distribution, showing names within the distribution of that geographical feature and can be repeated with appropriate distances and aesthetics;
- Long line features show repeated names with distances from 10.0 to 15.0 cm;
- Features located on more than one map piece will show the names on all the pieces when the map content tolerance allows.
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