20260630 15354300 1.0 TRUE 150000000 5000 ItemDescription Landslide Proxy Heat Map (Copernicus Sentinel-1) for the Venezuela Earthquake June 2026 <div style='text-align:Left;'><div><div>Dates of Images:Post-Event: 06/25/2026Pre-Event: 04/07/2026-06/13/2026 (8 images total)Summary:The NASA GSFC landslides team produced this landslide proxy heatmap from Sentinel-1 imagery. Potential landslides were detected by calculating the change in the backscatter coefficient before and after the triggering event using the log ratio approach (Iratio). The Iratio is generated by subtracting median pre- and post-event Radiometrically Terrain Corrected (RTC) gamma0 backscatter in decibel scale at 10 m resolution obtained from the Alaska Sar Facility’s Hybrid Pluggable Processing Pipeline (HyP3).The likely landslide pixels are identified using 99th percentile Iratio threshold considering areas greater than 10-degree in slope and not affected by radar shadow and layover effects. A heatmap is generated using identified landslide pixels for visualization ease.Pre-event imagery = median imagery generated using images from 04/07/2026-06/13/2026 (8 images total)Post-event imagery = 06/25/2026This map should be used as a guide to identify areas likely affected by landslides. This is a rapid response product. We have not done any form of manual verification or corrections to remove false positives.Suggested Use:The red and yellow areas indicate potential zones of dense landsliding. False positives related to natural and human-made ground surface change, including but not limited to deformation from mining, construction, deforestation, agriculture, flooding, snow cover, and changes in reservoir water levels can also be within the red and yellow areas.Satellite/Sensor/Resolution:Synthetic Aperture Radar on European Space Agency's (ESA) Copernicus Sentinel-1 satellite, 10 metersCredits:NASA GSFC landslides team, Copernicus Sentinel-1 dataCitation: Handwerger AL, Huang M-H, Jones SY, Amatya P, Kerner HR, Kirschbaum DB. 2022. Generating landslide density heatmaps for rapid detection using open-access satellite radar data in Google Earth Engine. Nat. Hazards Earth Syst. Sci. Copernicus Publications, 22(3): 753–773. https://doi.org/10.5194/nhess-22-753-2022.Esri REST Endpoint:See URL to the right.WMS Endpoint:See Sublayers.</div></div></div> NASA GSFC landslides team, Copernicus Sentinel-1 data. Citation: https://doi.org/10.5194/nhess-22-753-2022. NASA GSFC landslides team, NASA GSFC Data Science group Landslide Landslides NASA NASA Disasters Program Copernicus Sentinel-1 True Color South America Venezuela <div style='text-align:Left;'><div>NASA data and products are freely available to federal, state, public, non-profit and commercial users. This information can be experimental- or research-grade data products and may not be appropriate for operational use. These NASA data products, services, and the Disasters Mapping Portal are intended to aid decision makers and enhance situational awareness, but these data are not guaranteed to be consistently available or routinely updated.</div></div> 202611_sentinel1_landslide_heatmap 20260701