OPERA DSWx-HLS May 18, 2024
type: Dataset
description: Date of Images: During Event: 5/6/2024 Pre-Event: 4/21/2024 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 flood maps using the OPERA Dynamic Surface Water Extent (DSWx) from NASA Harmonized Landsat Sentinel-2 (HLS) products. The results posted here are preliminary and unvalidated results, primarily intended to aid the field response and people who wanted to have a rough first look at the inundation extent. ARIA/OPERA flood map derived from DSWx-HLS The ARIA/OPERA flood map is derived from two OPERA DSWx-HLS images taken on April 21, 2024 and May 06, 2024. These maps depict areas of new water detection that is interpreted as flood. The flood map was created by reclassifying the DSWx-HLS data into two new classes (1) water and (2) not water then taking the difference between the two images. The new water class includes DSWx-HLS classes for open water, partial surface water, and HLS snow/ice. We note the HLS snow/ice mask often misclassified sediment rich water as snow/ice. This reclassification was necessary to capture flood extent. The new not water class includes DSWx-HLS classes not water and HLS cloud/cloud shadow. OPERA DSWx-HLS OPERA DSWx-HLS data was used to identify surface water using the B01_WTR layer. Two images were examined 1) April 21, 2024 and 2) May 6, 2024. Each image consists of multiple MGRS tiles that were merged together for a composite image saved as a GeoTIFF file. OPERA DSWx-HLS data availability The post-processed products are available to download at https://aria-share.jpl.nasa.gov/202405-RioGrandeSul_Brazil-floods/. The OPERA DSWx-HLS products have been in production since April 2023, are freely distributed to the public via NASA's Physical Oceanography Distributed Active Archive Center (PO.DAAC), and can be downloaded through NASA's Earthdata…
issued: 2024-05-14T21:19:06+00:00
modified: 2024-05-15T19:57:12+00:00
publisher: NASA ArcGIS Online
keyword: ARIA
keyword: Brasil
keyword: Brazil
keyword: Flood
keyword: Flooding
keyword: Floods
keyword: HLS
keyword: Landsat
keyword: Landslide
keyword: NASA
keyword: NASA Disasters Program
keyword: OPERA
keyword: Sentinel-2
keyword: South America
landing page: https://disasters.amerigeoss.org/maps/NASA::opera-dswx-hls-may-18-2024

CSV
type: Distribution
format: CSV
issued: 2025-09-18T18:09:49.976909
modified: 2025-09-18T18:09:49.959043
access URL: https://disasters.amerigeoss.org/api/download/v1/items/3aa50f83605d4a6193ebabdeb01f91c7/csv

OGC WMS
type: Distribution
format: OGC WMS
issued: 2025-09-18T18:09:49.976907
modified: 2025-09-18T18:09:49.958963
access URL: https://maps.disasters.nasa.gov/ags04/services/brasil_flood_2024/ARIA_Water_Maps_derived_from_OPERA_DSWx_product_suite_for_Brasil_Flooding_and_Landslides/MapServer/WMSServer

KML
type: Distribution
format: KML
issued: 2025-09-18T18:09:49.976914
modified: 2025-09-18T18:09:49.959276
access URL: https://disasters.amerigeoss.org/api/download/v1/items/3aa50f83605d4a6193ebabdeb01f91c7/kml

ArcGIS GeoService
type: Distribution
format: ArcGIS GeoServices REST API
issued: 2025-09-18T18:09:49.976904
modified: 2025-09-18T18:09:49.958876
access URL: https://maps.disasters.nasa.gov/ags04/rest/services/brasil_flood_2024/ARIA_Water_Maps_derived_from_OPERA_DSWx_product_suite_for_Brasil_Flooding_and_Landslides/MapServer/8

GeoJSON
type: Distribution
format: GeoJSON
issued: 2025-09-18T18:09:49.976913
modified: 2025-09-18T18:09:49.959199
access URL: https://disasters.amerigeoss.org/api/download/v1/items/3aa50f83605d4a6193ebabdeb01f91c7/geojson

ArcGIS Hub Dataset
type: Distribution
format: HTML
issued: 2025-09-18T18:09:49.976899
modified: 2025-09-18T18:09:49.958757
access URL: https://disasters.amerigeoss.org/maps/NASA::opera-dswx-hls-may-18-2024

Shapefile
type: Distribution
format: ZIP
issued: 2025-09-18T18:09:49.976911
modified: 2025-09-18T18:09:49.959121
access URL: https://disasters.amerigeoss.org/api/download/v1/items/3aa50f83605d4a6193ebabdeb01f91c7/shapefile