GB/T 40527-2021 in English
VALIDDigital space photogrammetry—Map surveying specification
- Issued on:2021-10-11
- Implemented on:2021-10-11
- File Format:PDF
- Delivery:Via email within 5 business days
$379.00
| Standard No: | GB/T 40527-2021 |
| Document status: | VALID |
| Title in English: | Digital space photogrammetry—Map surveying specification |
| Title in Chinese: | 数字航天摄影测量 测图规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2021-10-11 |
| Implemented on: | 2021-10-11 |
| ICS Classification: | 07.040-Astronomy. Geodesy. Geography |
| Chinese Classification: | A77-Photogrammetry and Remote Sensing |
| Professional Classification: | GB-National Standard |
| Related Keywords: | digital space photogrammetry map
quality control points digital surface model mean error digital elevation model photogrammetry system basic contour interval digital orthophoto |
| Related Topics: | Three coordinate measurement of digital photography
Digital Photography Coordinate Measuring System measurement measurement chart measurement chart test GBT40527 GB/T 40527-2021 aerial photogrammetry |
《GB/T 40527-2021数字航天摄影测量 测图规范》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
| Product type | Accuracy requirements | Key processes | Quality control points |
|---|---|---|---|
| Digital surface model (DSM) | Grid spacing ≤ 10 times the image resolution | Point cloud matching→model editing→data mosaic | Water area processing accuracy and edge connection error ≤ 2 times the mean error |
| Digital elevation model (DEM) | Mountain grid spacing encryption processing | Feature line collection→TIN construction→gridding | Contour line fitting difference ≤ 0.5 basic contour interval |
| Digital orthophoto (DOM) | Plane error ≤ 1 pixel | Differential correction → Image fusion → Uniform color processing | Mosaic stitching line offset < 3 pixels |
Key technical requirements
Satellite image selection specifications
The standard stipulates that stereo mapping images must meet the following requirements: Same-track stereo image pairs are preferred, overlap ≥ 4%, and cloud coverage < 15%. Requirements for special terrain areas:
- 1:5000 scale: resolution ≤0.5m
- High-rise building areas: Photogrammetry system filtering processing is required
- Forest area collection: application of tree height correction coefficient
Implementation suggestions
Quality control system
Establish a three-level quality inspection mechanism:
- Self-inspection of process: Inspect immediately after each process is completed
- Process inspection: Use aerial triangulation encrypted points for accuracy verification
- Result acceptance: Perform 20% sampling inspection according to GB/T18316
Special terrain processing plan
For deformed landforms (such as landslides and gullies):
- 1:5000 mapping: height ratio＞2m needs to be indicated separately
- Difficult areas for stereoscopic collection: combined with field measurement points for assistance
- Use total station to survey objects in shadow areas
Analysis of standard evolution
This standard establishes a complete technical system for aerospace photogrammetry for the first time. The main innovations are:
- Break through the limitations of traditional aerial photography and establish the status of satellite image mapping
- Clearly define the differences in DSM/DEM production processes (8.4 vs 9.4 clauses)
- Introduce data fusion processing requirements for oblique photography
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 39608-2020 in English
Metadata for digital products of fundamental geographic information
2020-12-14 -
GB/T 14950-2009 in English
Terms of photogrammetry and remote sensing
2009-02-06 -
GB/T 27919-2011 in English
Specifications for IMU/GPS supported aerial photography
2011-12-30 -
GB/T 30115-2013 in English
Specifications for Vegetation Index Production from Satellite Remote Sensing Imagery
2013-12-17 -
GB/T 38935-2020 in English
On-orbit radiometric characteristics assessment for optical imaging remote sensor—VIS-SWIR
2020-07-21 -
GB/T 35636-2017 in English
Specification for surveying and mapping of urban underground space
2017-12-29
