September 14th to September 26th
type: Dataset
description: Date of Images: Syn-Event: 2024-09-26 23:38:04 (UTC) or 7:38 PM EDT Pre-Event: 2024-09-14 23:37:54 (UTC) or 7:38 PM EDT Summary: The Advanced Rapid Imaging and Analysis (ARIA) and Observational Products for End-Users from Remote Sensing Analysis (OPERA) teams at NASA's Jet Propulsion Laboratory and California Institute of Technology derived the surface water extent maps using the OPERA Dynamic Surface Water eXtent from Sentinel-1 (DSWx-S1) products. The results posted here are preliminary and unvalidated results, primarily intended to aid the field response and people who want to have a rough first look at the water extent. The ARIA-share website has always focused on posting preliminary results as fast as possible for disaster response. OPERA DSWx-S1 The OPERA DSWx-S1 data identifies surface water and inundated vegetation. We provide the Water (WTR) and the Binary Water (BWTR) layers. Images are provided from 1) September 14, 2024 and 2) September 26, 2024. Each image consists of multiple MGRS tiles that were merged together for a composite image saved as a GeoTIFF file. ARIA/OPERA water change map derived from OPERA DSWx-S1 The ARIA/OPERA water change map is derived from two OPERA DSWx-S1 Binary Water (BWTR) images taken on September 14, 2024 and September 26, 2024. The BTWR combines inundated vegetation and open water into a single water class.These maps depict areas of new water detection (or loss). The change map includes values of: (0) indicate no change between images, (1) absence of water pre-event, presence of water syn-event, and (-1) presence of water pre-event, absence of water syn-event. Satellite/Sensor: Synthetic Aperture Radar (SAR) instrument on European Space Agency's (ESA) Sentinel-1A satellite was used for both the September 14 and September 26 images. Resolution: 30 meters The DSWx-S1 products have these flags: 250 (light gray) and 251 (dark gray) represent HAND and layover/shadow masks, respectively. HAND mask (light gray, value 250) delineates…
issued: 2024-10-04T17:12:33+00:00
modified: 2024-10-04T17:12:34+00:00
publisher: NASA ArcGIS Online
keyword: ARIA
keyword: Copernicus
keyword: ESA
keyword: Florida
keyword: Georgia
keyword: Helene
keyword: Hurricane
keyword: NASA
keyword: NASA Disasters Program
keyword: OPERA
keyword: Sentinel-1
landing page: https://disasters.amerigeoss.org/maps/NASA::september-14th-to-september-26th

Shapefile
type: Distribution
format: ZIP
issued: 2025-09-18T18:06:20.570997
modified: 2025-09-18T18:06:20.558320
access URL: https://disasters.amerigeoss.org/api/download/v1/items/65d48ac13aaa4d2cab2d9a78d3733db9/shapefile

ArcGIS Hub Dataset
type: Distribution
format: HTML
issued: 2025-09-18T18:06:20.570991
modified: 2025-09-18T18:06:20.558032
access URL: https://disasters.amerigeoss.org/maps/NASA::september-14th-to-september-26th

ArcGIS GeoService
type: Distribution
format: ArcGIS GeoServices REST API
issued: 2025-09-18T18:06:20.570995
modified: 2025-09-18T18:06:20.558153
access URL: https://maps.disasters.nasa.gov/ags04/rest/services/hurricane_helene_2024/Map/MapServer/1

GeoJSON
type: Distribution
format: GeoJSON
issued: 2025-09-18T18:06:20.570998
modified: 2025-09-18T18:06:20.558398
access URL: https://disasters.amerigeoss.org/api/download/v1/items/65d48ac13aaa4d2cab2d9a78d3733db9/geojson

CSV
type: Distribution
format: CSV
issued: 2025-09-18T18:06:20.570996
modified: 2025-09-18T18:06:20.558239
access URL: https://disasters.amerigeoss.org/api/download/v1/items/65d48ac13aaa4d2cab2d9a78d3733db9/csv

KML
type: Distribution
format: KML
issued: 2025-09-18T18:06:20.570999
modified: 2025-09-18T18:06:20.558476
access URL: https://disasters.amerigeoss.org/api/download/v1/items/65d48ac13aaa4d2cab2d9a78d3733db9/kml