GB/T 45792-2025 in English
VALIDThematic map—Compilation specification for geographic base map
- Issued on:2025-05-30
- Implemented on:2025-09-01
- File Format:PDF
- Delivery:Via email within 8 business days
$844.00
| Standard No: | GB/T 45792-2025 |
| Document status: | VALID |
| Title in English: | Thematic map—Compilation specification for geographic base map |
| Title in Chinese: | 专题地图 地理底图编制规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 8 business days |
| Issued on: | 2025-05-30 |
| Implemented on: | 2025-09-01 |
| ICS Classification: | 07.040-Astronomy. Geodesy. Geography |
| Chinese Classification: | A75-Mapping in general |
| Professional Classification: | GB-National Standard |
| Related Keywords: | geographic base map introduction analysis
comprehensive geographic base map type urban block base map geographical base map types typecore geographical base map water conservancy facilities |
| Related Topics: | map
map Fluorescence map map eight topics Military geological map preparation |
《GB/T 45792-2025专题地图 地理底图编制规范》由TC230（全国地理信息标准化技术委员会）归口，主管部门为自然资源部（测绘地理）。
Introduction
Analysis of the core framework of the standard
| Chapters | Core content | Technical points |
|---|---|---|
| Basic provisions | Classification of geographic base maps and mathematical basis | 6 types of base maps, CGCS2000 coordinate system, 1985 elevation datum |
| Data source | Application of basic geographic information data | DLG/DEM/DOM data matching scale standard (Table 3) |
| Element selection | Load control and selection indicators | 10%-30% of the topographic map load, 8 types of quantitative indicators (Table 8) |
Comparison of key technical indicators
Analysis of differences in geographical base map types
| Type | Core elements | Thematic adaptability |
|---|---|---|
| Political district geographical base map | Boundary line + residential area (accounting for 60%) | Population/economic topics |
| Water system geographical base map | Water conservancy facilities + hydrological points (accounting for 45%) | Water Resources Special Topic |
| Topography Base Map | Contour + Relief Shading | National Land Space Planning |
Note:The urban block base map needs special processing of road network density (≥1.0mm symbol width)
Implementation Suggestions
Data Source Application Strategy
- Basic Geographic Data:It is recommended to use 1:250,000 DLG data at a scale of 1:500,000, and the plane accuracy must be ≤25m
- Map Results Data:When redrawing the administrative division map, it is necessary to retain all boundary lines and 80% of the residential areas
- Current updates: Administrative division changes shall be checked at least once a year, and important transportation elements shall be updated quarterly
Element integration skills
| Element type | Integration method | Example |
|---|---|---|
| Water system | Reject the short and take the long (rivers with diameter less than 50mm) | Preserve the source sections of seasonal rivers in the Qinghai-Tibet region |
| Residential areas | Grading merger (dense areas ≤20/100cm²) | Merge 30% of township-level residential areas in the Yangtze River Delta |
| Roads | Delete low-lying roads and preserve high-lying roads (reducing 40% of township roads) | Parallel expressways retain the main line |
Standard Evolution Analysis
Compared with GB/T 12343 series, this specification has the following major breakthroughs:
- Special requirements for new town block base map (Appendix C.5.2)
- Dynamic adjustment mechanism:Allow element index to float ±20%
- Color systematization:Clear CMYK standard color value (Appendix B.2)
Typical application cases
Thematic atlas of the Yangtze River Economic Belt:Using the comprehensive geographic base map type, the water system selection index is enlarged by 15% to highlight the golden waterway, and the residential density is controlled at 12/100cm².
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