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Date of Images:<\/span><\/p>

Post-Event: June 26, 2025 at 00:59 UTC (about 6:59PM MT)<\/span><\/p>

Pre-Event: June 20, 2025<\/span><\/p>

<\/p>

Summary:<\/span><\/p>

We developed a rapid-response workflow to map flooded areas during this emergency event using multi-temporal Sentinel-1 SAR data. Sentinel-1\u2019s SAR backscatter characteristics are particularly effective for detecting surface water: water surfaces typically exhibit low backscatter, whereas non-water areas show higher backscatter. Leveraging this physical property, we distinguished between water and non-water surfaces from both pre- and post-flood observations.<\/span><\/p>

To highlight flood-induced surface changes, we computed the differenced co-polarized VV backscatter (dVV = VV_post \u2013 VV_pre). This change detection technique enhances the visibility of newly inundated areas. We then applied a simple threshold to the dVV image to separate flooded from non-flooded areas.<\/span><\/p>

<\/p>

Suggested Use:<\/span><\/p>

The final output is a binary raster product, where pixels with a value of 1 represent flooded areas (dark blue color).<\/span><\/p>

<\/p>

Satellite/Sensor:<\/span><\/p>

Sentinel-1 /Synthetic Aperture Radar (SAR)<\/span><\/p>

<\/p>

Resolution:<\/span><\/p>

10 meters<\/span><\/p>

<\/p>

Credits:<\/span><\/p>

Dr. Khuong H. Tran (Khuong.tran@nasa.gov)<\/span><\/p>

<\/p>

Service URL:<\/span><\/p>

<\/p>

WMS Endpoint:<\/span><\/p>

<\/div><\/div><\/div><\/p>", "pixelType": "U8", "meanPixelSize": 9.9999999999999822, "exportTilesAllowed": false, "editFieldsInfo": null, "rasterTypeInfos": [{ "help": "", "name": "Raster Dataset", "description": "Supports all ArcGIS Raster Datasets" }], "defaultResamplingMethod": "Bilinear", "itemAccess": false, "minScale": 0, "serviceProperties": "NorthWest<\/MosaicMethod>First<\/MosaicOperator>true<\/SortAscending><\/LockImageID>Name<\/TileOrderField>0<\/TileOrderBase>600.000000<\/AvgImageSpacingX>300.000000<\/AvgImageSpacingY>0.0<\/ViewPointX>0.0<\/ViewPointY>0.0<\/ViewPointDefShiftX>0.0<\/ViewPointDefShiftY>None<\/CompressionMethod>75<\/CompressionQuality>0.010000<\/CompressionTolerance>Bilinear<\/SamplingMethod><\/ImageServiceProperties><\/ImageServer>", "advancedQueryCapabilities": { "supportsStatistics": true, "supportsSqlExpression": true, "supportsOrderBy": true, "useStandardizedQueries": true, "supportsPagination": true, "supportsDistinct": true }, "serviceItemId": "87d3edc8e19d437da1336481506ff377", "capabilities": "Catalog,Mensuration,Image,Metadata", "maxScale": 0, "stdvValues": [], "allowedFields": "Name,MinPS,MaxPS,LowPS,HighPS,Tag,GroupName,ProductName,CenterX,CenterY,ZOrder,Shape_Length,Shape_Area,Date", "minPixelSize": 0, "sortAscending": true, "maxMosaicImageCount": 20, "inspectionCapabilities": "", "maxPixelSize": 0, "uncompressedSize": 358840818, "serviceDescription": "

Date of Images:<\/span><\/p>

Post-Event: June 26, 2025 at 00:59 UTC (about 6:59PM MT)<\/span><\/p>

Pre-Event: June 20, 2025<\/span><\/p>

<\/p>

Summary:<\/span><\/p>

We developed a rapid-response workflow to map flooded areas during this emergency event using multi-temporal Sentinel-1 SAR data. Sentinel-1\u2019s SAR backscatter characteristics are particularly effective for detecting surface water: water surfaces typically exhibit low backscatter, whereas non-water areas show higher backscatter. Leveraging this physical property, we distinguished between water and non-water surfaces from both pre- and post-flood observations.<\/span><\/p>

To highlight flood-induced surface changes, we computed the differenced co-polarized VV backscatter (dVV = VV_post \u2013 VV_pre). This change detection technique enhances the visibility of newly inundated areas. We then applied a simple threshold to the dVV image to separate flooded from non-flooded areas.<\/span><\/p>

<\/p>

Suggested Use:<\/span><\/p>

The final output is a binary raster product, where pixels with a value of 1 represent flooded areas (dark blue color).<\/span><\/p>

<\/p>

Satellite/Sensor:<\/span><\/p>

Sentinel-1 /Synthetic Aperture Radar (SAR)<\/span><\/p>

<\/p>

Resolution:<\/span><\/p>

10 meters<\/span><\/p>

<\/p>

Credits:<\/span><\/p>

Dr. Khuong H. Tran (Khuong.tran@nasa.gov)<\/span><\/p>

<\/p>

Service URL:<\/span><\/p>

<\/p>

WMS Endpoint:<\/span><\/p>

<\/div><\/div><\/div><\/p>", "allowCopy": true, "copyrightText": "Dr. Khuong H. Tran (Khuong.tran@nasa.gov)", "mensurationCapabilities": "Basic", "ownershipBasedAccessControlForRasters": null }