GB/T 20257.3-2017Cartographic symbols for national fundamental scale maps—Part 3: Specifications for cartographic symbols 1:25 000 1:50 000 & 1:100 000 topographic maps (English PDF)

Foreword

GB/T 20257 "National Basic Scale Map" is divided into four parts.

--- Part 1. 1:500 1:1 000 1:2 000 topographic map;

--- Part 2. 1:5 000 1:10 000 topographic map;

--- Part 3. 1:25 000 1:50 000 1:100 000 topographic map;

--- Part 4. 1:250 000 1:500 000 1:1 000 000 topographic map.

This part is the third part of GB/T 20257.

This part replaces GB/T 20257.3-2006 "National Basic Scale Map Drawing Part 3. 1:25 000, 1:50 000, 1:100 000 topographic map. The main changes in this section compared with GB/T 20257.3-2006 are as follows.

--- Added 19 elements. water well house, drying room, other use houses, tailings pond, tower, construction area, open warehouse, material factory, temperature Room, greenhouse, port, dedicated oxygen supply point, sunbathing platform, windproof wall, high-speed railway, observation deck, village road, wildlife passage, heat sink, Territorial sea baseline, territorial sea base point, wind-proof and sand-fixing square;

--- Supplementary and improved indicators of the selection of factors;

--- Modify the 4.1 measurement control point in the original standard to the positioning basis;

--- Remove the main roads, secondary trunk roads and feeder lines in the original standard 4.3.1 block from the residential areas and facilities, and class them into 4.4 traffic categories;

--- Remove the original standard 4.2.21.1 open reef from the reef and into the island of 4.2.2 Island water;

--- Improve the 4.3.38 schools in residential areas and facilities, and modify "b. primary and secondary schools" to "b. primary, primary and vocational education schools";

--- Change the other roads in 4.4.8 to village roads and add a brief description of the village roads;

---Modified some symbol size, color, description and other errors in the original standard.

1 Scope

This part of GB/T 20257 specifies various features and topography represented on the 1:25 000 1:50 000 1:100 000 topographic map. The symbols, notes, and outlines of the prime, as well as the methods and basic requirements for using them.

This section applies to the mapping of 1:25 000 1:50 000 1:100 000 topographic maps. Prepare a geographical base map or survey similar scale The map can be used as reference.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this document. For undated references, the latest edition (including all amendments) applies to this document.

GB/T 13989 national basic scale topographic map framing and numbering

3 General regulations