Difference between revisions of "PRODUCTS"
From MyDewetra World
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| − | ''Note: this section provides a concise description of the products provided by the | + | ''Note: this section provides a concise description of the products provided by the '''GFM'''. <br> |
| − | For a more comprehensive documentation the reader is referred to the ''' | + | For a more comprehensive documentation the reader is referred to the '''GFM Products Description Document'''.'' |
| − | The | + | The GFM makes available a full set of NRT flood mapping-related products as listed below: |
{| class="wikitable" style="margin: auto;" | {| class="wikitable" style="margin: auto;" | ||
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|Number of people in flooded areas, mapped by a spatial overlay of observed flood extent <br> and gridded population | |Number of people in flooded areas, mapped by a spatial overlay of observed flood extent <br> and gridded population | ||
|''raster (Geotiff)'' | |''raster (Geotiff)'' | ||
| + | |- | ||
| + | |11. [[Affected Land Cover]] | ||
| + | |Land cover type flooded | ||
| + | |''raster (Geotiff)'' | ||
| + | |- | ||
| + | |} | ||
| + | |||
| + | |||
| + | The key specification of the products are provided in the table below | ||
| + | |||
| + | {| class="wikitable" style="margin: auto;" | ||
| + | !colspan="2" |Input satellite data | ||
| + | |- | ||
| + | |Satellite sensor | ||
| + | |S-1 - Synthetic Aperture Radar (SAR) | ||
| + | |- | ||
| + | |Acquisition mode | ||
| + | |Interferometric Wide Swath (IW) | ||
| + | |- | ||
| + | |Data product | ||
| + | |Level-1 - Ground Range Detected (GRD) | ||
| + | |- | ||
| + | |Spatial sampling | ||
| + | |20 x 22 metres | ||
| + | |- | ||
| + | |Global revisit frequency | ||
| + | |Europe: ~1-3 days. Rest of the world: ~3-14 days, depending on location | ||
| + | |- | ||
| + | |SAR polarisation scheme | ||
| + | |VV + VH | ||
| + | |- | ||
| + | !colspan="2" |GENERAL GFM PRODUCT SPECIFICATIONS | ||
| + | |- | ||
| + | |Geographic coverage | ||
| + | |Global | ||
| + | |- | ||
| + | |Pixel size | ||
| + | |20 metres | ||
| + | |- | ||
| + | |Timeliness | ||
| + | |<8 hours after S-1 image acquisition. | ||
|- | |- | ||
|11. [[Affected Land Cover]] | |11. [[Affected Land Cover]] | ||
Revision as of 15:31, 4 February 2021
Note: this section provides a concise description of the products provided by the GFM.
For a more comprehensive documentation the reader is referred to the GFM Products Description Document.
The GFM makes available a full set of NRT flood mapping-related products as listed below:
| Products | Data format | |
|---|---|---|
| 1. S-1 Observed Flood Extent | Flooded areas mapped as the difference between S-1 observed water extent and the reference water mask. |
raster (Geotiff) and vector(shapefile) |
| 2. S-1 Observed Water Extent | Open and calm water mapped using S-1 SAR backscatter intensity. | raster (Geotiff) and vector(shapefile) |
| 3. S-1 Reference Water Mask | Normal (i.e. permanent, seasonal) water mapped using S-1 SAR backscatter intensity. | raster (Geotiff) and vector(shapefile) |
| 4. Exclusion Mask | Unclassified areas | raster (Geotiff) |
| 5. Uncertainty Values | Estimated uncertainty of flood mapping, for all areas outside exclusion mask | raster (Geotiff) |
| 6. Advisory Flags | Flags indicating potential reduced quality of flood mapping, due to prevailing environmental conditions (e.g. wind, ice, snow, dry soil), or degraded input data quality due |
raster (Geotiff) |
| 7. Sentinel-1 Metadata | Information on the acquisition parameters of the S-1 data used | KML |
| 8. Sentinel-1 Footprint | Image boundaries of the S-1 data used | KML |
| 9. Sentinel-1 Schedule | Next scheduled S-1 data acquisition | KML |
| 10. Affected Population | Number of people in flooded areas, mapped by a spatial overlay of observed flood extent and gridded population |
raster (Geotiff) |
| 11. Affected Land Cover | Land cover type flooded | raster (Geotiff) |
The key specification of the products are provided in the table below
| Input satellite data | ||
|---|---|---|
| Satellite sensor | S-1 - Synthetic Aperture Radar (SAR) | |
| Acquisition mode | Interferometric Wide Swath (IW) | |
| Data product | Level-1 - Ground Range Detected (GRD) | |
| Spatial sampling | 20 x 22 metres | |
| Global revisit frequency | Europe: ~1-3 days. Rest of the world: ~3-14 days, depending on location | |
| SAR polarisation scheme | VV + VH | |
| GENERAL GFM PRODUCT SPECIFICATIONS | ||
| Geographic coverage | Global | |
| Pixel size | 20 metres | |
| Timeliness | <8 hours after S-1 image acquisition. | |
| 11. Affected Land Cover | Land cover type flooded | raster (Geotiff) |
