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  "Title": "sentinel1_waterextend_difference",
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  "Comments": "<DIV STYLE=\"text-align:Left;\"><DIV><DIV><P><SPAN STYLE=\"font-weight:bold;\">Dates of Images:<\/SPAN><\/P><P><SPAN>5/7/2024-4/30/2024; 5/12/2024-5/7/2024<\/SPAN><\/P><P><SPAN STYLE=\"font-weight:bold;\">Date of Next Image:<\/SPAN><\/P><P><SPAN>Unknown<\/SPAN><\/P><P><SPAN STYLE=\"font-weight:bold;\">Summary:<\/SPAN><\/P><P><SPAN>The Alaska Satellite Facility has developed water extent images using the Sentinel-1A/B Synthetic Aperture Radar (SAR) instrument. These images can be used to see where water is located at the time of the satellite overpass. This product shows all water detected and does not differentiate between normal water and flood water. To determine where flooding may have occurred, combine this layer with a reference water layer.<\/SPAN><\/P><P><SPAN>The water extent difference maps shown here were created by subtracting the water extent of the first date from the water extent of the second date to show what changes, if any, occurred in the water extent.<\/SPAN><\/P><P><SPAN STYLE=\"font-weight:bold;\">Suggested Use:<\/SPAN><\/P><UL><LI><P><SPAN>Light Blue: Water Present in the Second Date Only<\/SPAN><\/P><\/LI><LI><P><SPAN>Dark Blue: Water Present in Both Dates<\/SPAN><\/P><\/LI><LI><P><SPAN>Orange: Water Present in the First Date Only<\/SPAN><\/P><\/LI><\/UL><P><SPAN STYLE=\"font-weight:bold;\">Satellite/Sensor:<\/SPAN><\/P><P><SPAN>Synthetic Aperture Radar on European Space Agency's (ESA) Copernicus Sentinel-1A satellite<\/SPAN><\/P><P><SPAN STYLE=\"font-weight:bold;\">Resolution:<\/SPAN><\/P><P><SPAN>30 meters<\/SPAN><\/P><P><SPAN STYLE=\"font-weight:bold;\">Esri REST Endpoint:<\/SPAN><\/P><P><SPAN>See URL section on right side of page<\/SPAN><\/P><P><SPAN STYLE=\"font-weight:bold;\">WMS Endpoint:<\/SPAN><\/P><P><SPAN STYLE=\"font-weight:bold;\">Data Download:<\/SPAN><\/P><P><A href=\"https://maps.disasters.nasa.gov:443/download/gis_products/event_specific/2024/texas_flood_202405/sentinel1/\" STYLE=\"text-decoration:underline;\"><SPAN>https://maps.disasters.nasa.gov/download/gis_products/event_specific/2024/texas_flood_202405/sentinel1/<\/SPAN><\/A><\/P><P><SPAN /><\/P><\/DIV><\/DIV><\/DIV>",
  "Subject": "Water Extent Difference Maps (Sentinel-1) for May 2024 Texas Floods",
  "Category": "",
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  "TextAntialiasingMode": "Force",
  "Version": "2.9.0",
  "Keywords": "NASA,NASA Disasters Program,Texas,Flood,Sentinel-1,Copernicus,ESA,Alaska Satellite Facility,HydroSAR,Houston"
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