GB/T 39608-2020 in English
VALIDMetadata for digital products of fundamental geographic information
- Issued on:2020-12-14
- Implemented on:2020-12-14
- File Format:PDF
- Delivery:Via email within 5 business days
$476.00
《GB/T 39608-2020基础地理信息数字成果元数据》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 content of the standard
| Outcome type | Required metadata items | Special requirements | Sample appendix |
|---|---|---|---|
| DLG | Number of feature layers, contour interval, and edge status | Information of 26 feature layers needs to be recorded | Appendix B |
| DOM | Image resolution and color mode | The value of the no-value area needs to be indicated | Appendix C |
| DEM | Grid size, elevation benchmark | Interpolation method needs to be declared | Appendix D |
| DSM | Point cloud density, average point spacing | Lidar parameters need to be marked | Appendix E |
Key technical requirements
The standard stipulates that metadata must include five major categories of content: identification information, spatial reference information, production information, quality information and distribution information. Among them:
- Coordinate system parameters must be accurate to 1/298.257222101 flattening
- The time format must be YYYYMMDD eight-bit code
- Valueless data must be clearly marked as "None" instead of leaving it blank
Implementation Suggestions
Take DOM production as an example:
- The satellite sensor type needs to be recorded (such as WorldView-2)
- The ground resolution is accurate to 0.5 meters
- The version of the orthorectification software needs to be indicated (such as Pixel Factory 4.0)
Pay special attention to the fact that the edge quality evaluation must include the four-direction edge status record.
Analysis of Standard Evolution
Main improvements compared to the previous version of the standard:
- Added DSM metadata specification
- Refined LiDAR parameter requirements
- Strengthened spatial reference system description (added 2000 coordinate system)
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