S1A 20240926 N rgb.tif
type: Dataset
description: Dates of Images: Pre-Event: 9/14, 9/16, 9/19, 9/21 Post-Event: 9/26, 9/28 Date of Next Image: Varies by region, typically 12 days since previous pass. Set time slider to most recent interval and click on area of interest to identify date of last pass. Summary: The Alaska Satellite Facility has developed false color Red, Green, Blue (RGB) and Radiometrically Terrain-Correct (RTC) composites and surface water extent products of the Sentinel-1A/B Synthetic Aperture Radar (SAR) instrument which assigns the co- and cross-polarization information to a channel in the composite. When used to support a flooding event, areas in blue denotes water present at the time of the satellite overpass before or after the start of the flooding event. Sentinel-1 RGB Decomposition of RTC VV and VH imagery over United States coastlines. Blue areas have low returns in VV and VH (smooth surfaces such as calm water, but also frozen/crusted soil or dry sand), Green areas have high returns in VH (volume scatterers such as vegetation or some types of snow/ice), and Red areas have relatively high VV returns and relatively low VH returns (such as urban or sparsely vegetated areas). Suggested Use: In this image, water appears in blue, vegetated areas in shades of green and urban areas in bright orange. It is recommended to use this product with ancillary information to derive flooded areas. Post-event data is classified from the above imagery shows water that is detected by the sensor with different colors indicating different land cover/land use classifications from CDL that appear to have water and are potentially flooded. Blue (1): Known Water Red (2): Flooded Developed Green (3): Flooded Vegetation Orange (4): Flooded Cropland/Grassland Gray (5): Clouds/Cloud Shadow (0): No Data Satellite/Sensor: Synthetic Aperture Radar on European Space Agency's (ESA) Copernicus Sentinel-1A/B satellite NOTE: Sentinel-1B is no longer acquiring data and is only available into December 2021 Resolution: 20 meters…
issued: 2024-10-04T17:12:14+00:00
modified: 2024-10-08T17:56:18+00:00
publisher: NASA ArcGIS Online
keyword: 2024
keyword: Copernicus
keyword: Flood
keyword: Flooding
keyword: Floods
keyword: Florida
keyword: Georgia
keyword: Helene
keyword: Hurricanes
keyword: NASA
keyword: NASA Disasters Program
keyword: North Carolina
keyword: Sentinel-1
keyword: South Carolina
landing page: https://disasters.amerigeoss.org/maps/NASA::s1a-20240926-n-rgb-tif

KML
type: Distribution
format: KML
issued: 2025-09-18T18:05:15.574174
modified: 2025-09-18T18:05:15.557795
access URL: https://disasters.amerigeoss.org/api/download/v1/items/192590daddfe4de7a6cae58f9169a177/kml

CSV
type: Distribution
format: CSV
issued: 2025-09-18T18:05:15.574170
modified: 2025-09-18T18:05:15.557553
access URL: https://disasters.amerigeoss.org/api/download/v1/items/192590daddfe4de7a6cae58f9169a177/csv

ArcGIS GeoService
type: Distribution
format: ArcGIS GeoServices REST API
issued: 2025-09-18T18:05:15.574168
modified: 2025-09-18T18:05:15.557371
access URL: https://maps.disasters.nasa.gov/ags04/rest/services/hurricane_helene_2024/sentinel1/MapServer/29

ArcGIS Hub Dataset
type: Distribution
format: HTML
issued: 2025-09-18T18:05:15.574163
modified: 2025-09-18T18:05:15.557208
access URL: https://disasters.amerigeoss.org/maps/NASA::s1a-20240926-n-rgb-tif

Shapefile
type: Distribution
format: ZIP
issued: 2025-09-18T18:05:15.574172
modified: 2025-09-18T18:05:15.557635
access URL: https://disasters.amerigeoss.org/api/download/v1/items/192590daddfe4de7a6cae58f9169a177/shapefile

OGC WMS
type: Distribution
format: OGC WMS
issued: 2025-09-18T18:05:15.574169
modified: 2025-09-18T18:05:15.557468
access URL: https://maps.disasters.nasa.gov/ags04/services/hurricane_helene_2024/sentinel1/MapServer/WMSServer

GeoJSON
type: Distribution
format: GeoJSON
issued: 2025-09-18T18:05:15.574173
modified: 2025-09-18T18:05:15.557718
access URL: https://disasters.amerigeoss.org/api/download/v1/items/192590daddfe4de7a6cae58f9169a177/geojson