Difference between revisions of "PRODUCTS"

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''Note: this section provides a concise description of the products provided by the GFMS. <br>
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''Note: this section provides a concise description of the products provided by the '''GFM'''. <br>
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For a more comprehensive documentation the reader is referred to the '''GFMS Products Description Document'''.''
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For a more comprehensive documentation the reader is referred to the '''GFM Products Description Document'''.''
  
  
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The GFMS makes available a full set of NRT flood mapping-related products as listed below:
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The GFM makes available a full set of NRT flood mapping-related products as listed below:
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# [[S-1 Observed Flood Extent]]
 
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# [[S-1 Observed Water Extent]]
 
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# [[S-1 Reference Water Mask]]
 
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# [[Exclusion Mask]]
 
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# [[Uncertainty Values]]
 
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# [[Advisory Flags]]
 
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# [[Sentinel-1 Metadata]]
 
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# [[Sentinel-1 Footprint]]
 
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# [[Sentinel-1 Footprint]]
 
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# [[Affected Population]]
 
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# [[Affected Land Cover]]
 
  
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It is worth mentioning that, output layers 1 (observed flood event), 2 (observed water extent), and 3 (reference water mask) are provided in both, raster (Geotiff) and vector (shapefile) format. Output layers 4 (exclusion mask), 5 (uncertainty values), 6 (advisory flags), and 10 (affected population) and the additional proposed 11 (affected landcover) are provided in raster format (Geotiff), output layer 8 (Sentinel-1 footprint) in vector format and output layer 9 (Sentinel- 1 schedule) as a KML files.
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{| class="wikitable" style="margin: auto;"
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!Products
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!Description
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!Data Formats
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|-
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|1. [[S-1 Observed Flood Extent]]
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|Flooded areas mapped as the difference between S-1 observed water extent <br> and the reference water mask.
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|''raster (Geotiff) and vector(shapefile)''
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|-
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|2. [[S-1 Observed Water Extent]]
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|Open and calm water mapped using S-1 SAR backscatter intensity.
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|''raster (Geotiff) and vector(shapefile)''
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|-
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|3. [[S-1 Reference Water Mask]]
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|Normal (i.e. permanent, seasonal) water mapped using S-1 SAR backscatter intensity.
 +
|''raster (Geotiff) and vector(shapefile)''
 +
|-
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|4. [[Exclusion Mask]]
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|Unclassified areas
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|''raster (Geotiff)''
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|-
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|5. [[Uncertainty Values]]
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|Estimated uncertainty of flood mapping, for all areas outside exclusion mask
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|''raster (Geotiff)''
 +
|-
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|6. [[Advisory Flags]]
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|Flags indicating potential reduced quality of flood mapping, due to prevailing <br>
 +
environmental conditions (e.g. wind, ice, snow, dry soil), or degraded input data quality due <br>
 +
to signal interference from other SAR missions (e.g. Radarsat)
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|''raster (Geotiff)''
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|-
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|7. [[Sentinel-1 Metadata]]
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|Information on the acquisition parameters of the S-1 data used
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|''KML''
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|-
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|8. [[Sentinel-1 Footprint]]
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|Image boundaries of the S-1 data used
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|''KML''
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|-
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|9. [[Sentinel-1 Schedule]]
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|Next scheduled S-1 data acquisition
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|''KML''
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|-
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|10. [[Affected Population]]
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|Number of people in flooded areas, mapped by a spatial overlay of observed flood extent <br> and gridded population
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|''raster (Geotiff)''
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|-
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|11. [[Affected Land Cover]]
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|Land cover type flooded
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|''raster (Geotiff)''
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|-
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|}
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 +
 
 +
The key specifications of the products are provided in the table below
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{| class="wikitable" style="margin: auto;"
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!colspan="2" |Input satellite data
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|-
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|Satellite sensor
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|S-1 - Synthetic Aperture Radar (SAR)
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|-
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|Acquisition mode
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|Interferometric Wide Swath (IW)
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|-
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|Data product
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|Level-1 - Ground Range Detected (GRD)
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|-
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|Spatial sampling
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|20 x 22 metres
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|-
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|Global revisit frequency
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|Europe: ~1-3 days. Rest of the world: ~3-14 days, depending on location
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|-
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|SAR polarisation scheme
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|VV + VH
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|-
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!colspan="2" |General product specifics
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|-
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|Geographic coverage
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|Global
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|-
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|Pixel size
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|20 metres
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|-
 +
|Timeliness
 +
|<8 hours after S-1 image acquisition.
 +
|-
 +
|Thematic accuracy
 +
|Target threshold of >70-80%, based on the Critical Success Index
 +
|-
 +
|}

Latest revision as of 15:36, 4 February 2021

[Home]

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 Description Data Formats
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
to signal interference from other SAR missions (e.g. Radarsat)

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 specifications 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 product specifics
Geographic coverage Global
Pixel size 20 metres
Timeliness <8 hours after S-1 image acquisition.
Thematic accuracy Target threshold of >70-80%, based on the Critical Success Index
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