GB/T 40766-2021 in English
VALIDDigital space photogrammetry—Specifications for control survey
- Issued on:2021-10-11
- Implemented on:2021-10-11
- File Format:PDF
- Delivery:Via email within 5 business days
$447.00
《GB/T 40766-2021数字航天摄影测量 控制测量规范》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
Interpretation of the core content of the standard
| Technical elements | 1:5000-1:10000 | 1:25000-1:100000 |
|---|---|---|
| Meanwhile error of image control point in plane | ≤±0.1mm on the map | ≤±0.1mm on the map |
| Meanwhile error of elevation | ≤1/10 of basic contour interval | Classification by terrain category (Table 1) |
| Satellite image resolution | Full color ≥ 0.5-1.0 m | Full color ≥ 2.5-10.0 m |
Key technical implementation points
1. Establishment of spatial reference system
The 2000 National Geodetic Coordinate System (CGCS2000) and the 1985 National Height Datum are used. The 1:5000-1:10000 scale uses the 3° zone Gauss-Krüger projection, and the larger scale uses the 6° zone. In special cases, the coordinate system conversion parameters need to be clarified in the technical design.
2. Image control point layout method
Typical application case: In a 1:10000 mapping project in mountainous areas, when using GNSS RTK for field image control point measurement, it should be ensured that the point targets are clearly identifiable in the image (such as rock corners, independent features), the distance between adjacent points does not exceed 2km, and the regional quasi-geoid refined model is used for elevation conversion.
Analysis of Standard Evolution
This standard constructs a complete control measurement system for digital aerospace photogrammetry for the first time. Compared with traditional aerial photogrammetry specifications:
- Added quantitative indicators such as satellite image side viewing angle (≤25°) and overlap (≥10%)
- Introduced the concept of regional block adjustment to support joint processing of multi-source satellite images
- Specified the extraction accuracy requirements of graphic image control points (the plane reaches DOM ground object point accuracy)
Implementation Suggestions
- Instrument selection:Give priority to GNSS receivers with a nominal accuracy better than 5mm+1ppm, and calibrate them regularly
- Quality control:Establish a secondary inspection mechanism, and 100% of the adjacent point spacing in field image control point measurements must be checked
- Results management: The electronic image control point record should include the original resolution image (1023×1023 pixels) and 3D coordinate information
Loading PDF document...
Error loading PDF. Please make sure the file is valid and try again.
We also recommend
-
GB/T 12979-2024 in English
Specifications for close-range photogrammetry
2024-08-23 -
GB/T 45631-2025 in English
Requirements for flying management information of surveying and mapping with unmanned aircraft system (UAS)
2025-04-25 -
GB/T 27919-2011 in English
Specifications for IMU/GPS supported aerial photography
2011-12-30 -
GB/T 35636-2017 in English
Specification for surveying and mapping of urban underground space
2017-12-29 -
GB/T 7930-2008 in English
Specifications for aerophotogrammetric office operation of 1∶500 1∶1000 1∶2000 topographic maps
2008-06-20 -
GB/T 38935-2020 in English
On-orbit radiometric characteristics assessment for optical imaging remote sensor—VIS-SWIR
2020-07-21
