SL/T 797-2020 in English
VALIDProtocol for water spatial data exchange
- Issued on:2020-07-24
- Implemented on:2020-10-24
- File Format:PDF
- Delivery:Via email within 1~3 business days
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| Standard No: | SL/T 797-2020 |
| Document status: | VALID |
| Title in English: | Protocol for water spatial data exchange |
| Title in Chinese: | 水利空间数据交换协议 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2020-07-24 |
| Implemented on: | 2020-10-24 |
| Professional Classification: | SL-Water Resources |
| Related Topics: | water conservancy
Ministry of Water Resources profit water data spatial data space version Change Protocol Converter Water conservancy data directory service Recommended space standard protocol sl/t247-2020 |
Introduction
Analysis of the core content of the standard
| Technical dimensions | Vector data requirements | Raster data requirements |
|---|---|---|
| Exchange content | Graphics + attribute data (in accordance with SL/T 783) | Regular grid + attribute data |
| Metadata items | 21 mandatory items (Appendix A Table A.1) | 23 mandatory items (Appendix A Table A.2) |
| Exchange format | Shapefile/GeoJSON/GML | GeoTIFF |
Key Technical Specifications
1. Innovation in Exchange Mode
The standard defines three exchange mechanisms:
- Active Push: Direct transmission through the WebService interface
- Request/Response: Using XML format message interaction (Appendix B)
- Publish/Subscribe: Based on the SL/T 803 directory service
2. Data Quality Requirements
- The coordinate system shall preferably use CGCS2000
- The default elevation datum is the 1985 National Elevation Datum
- The time datum uses Beijing Time (time zone must be specified)
Implementation and application cases
The Yangtze River Conservancy Commission applies this standard in the 2022 flood forecasting system:
- Real-time raster data exchange with 12 hydrological stations
- Adopting a publish/subscribe model, data delay <5 minutes
- The metadata integrity rate reaches 100%, meeting the requirements of Appendix A
Standard evolution analysis
Main improvements compared to the 2007 version:
- Added support for JSON format (GeoJSON)
- Refine the incremental exchange mechanism (Chapter 5.2)
- Strengthen security classification (three levels: public/internal/restricted)
Implementation recommendations
- Deployment of class=instrument>SL/T 805 data exchange middleware
- Establish metadata automatic verification mechanism
- Preferentially adopt the element schema defined in Appendix D
Sample only — not a preview of SL/T 797-2020
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