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Use at your own risk.<\/span><\/p><p><span style='font-style:italic;'>OPERA DIST-ALERT-HLS<\/span><\/p><p><span>The Disturbance product (DIST) maps per pixel vegetation disturbance (specifically, vegetation cover loss) from the Harmonized Landsat Sentinel-2 (HLS) scenes. We provide the maximum vegetation anomaly value (VEG-ANOM-MAX) layer. All provided layers have been temporally filtered to include only disturbance detected following the start of Hurricane Melissa (starting October 28, 2025). Images are provided as GeoTIFF files. <\/span><\/p><p><span>Note: Artifacts caused by clouds and cloud shadows are present in the product. The DIST-HLS product will eventually be updated to address these issues as more cloud-free data becomes available.<\/span><\/p><p><span style='font-style:italic;'>VEG-ANOM-MAX:<\/span><\/p><p><span>Difference between historical and current year observed vegetation cover at the date of maximum decrease (vegetation loss of 0-100%). This layer can be used to threshold vegetation disturbance per a given sensitivity (e.g. disturbance of &gt;=20% vegetation cover loss). The sum of the historical percent vegetation and the anomaly value will be the vegetation cover estimate for the current year.  <\/span><\/p><p><span style='font-style:italic;'>Layer values:<\/span><\/p><ul><li><p><span>0-100: Maximum loss of percent vegetation (suggested color: white to red gradient)<\/span><\/p><\/li><li><p><span>255: No data (suggested color: transparent)<\/span><\/p><\/li><\/ul><p><span style='font-weight:bold;'>Satellite/Sensor:<\/span><\/p><p><span>MultiSpectral Instrument (MSI) on European Space Agency's (ESA) Copernicus Sentinel-2A/B satellites and Operational Land Imager 2 (OLI-2) on NASA's Landsat 8/9 satellite.<\/span><\/p><p><span style='font-weight:bold;'>Resolution:<\/span><\/p><p><span>30 meters<\/span><\/p><p><span>The DIST-ALERT-HLS products included here have these flags:<\/span><\/p><p><span>255 represents ''No Data'' and is based on the Fmask layer of the source HLS granule.  <\/span><\/p><p><span style='font-style:italic;'>OPERA DIST-ALERT-HLS data availability:<\/span><\/p><p><span><b>Note: <\/b>some direct straight lines on the edges of domains or within the data may represent boundaries between satellites or satellite overpasses as this is a hybrid product from multiple distinct assets.<\/span><\/p><p><span>The post-processed products are available to download at <\/span><a href='https://aria-share.jpl.nasa.gov/20251028_Hurricane_Melissa/DIST-HLS/' target='_blank'>https://aria-share.jpl.nasa.gov/20251028_Hurricane_Melissa/DIST-HLS/<\/a><\/p><p><span>The OPERA DIST-HLS products have been in production since January 2022, are freely distributed to the public via NASA's Land Processes Distributed Active Archive Center (LP DAAC), and can be downloaded through NASA's Earthdata search. For more information about the Surface Disturbance product suite, please refer to the DIST Product page: <\/span><a href='https://www.jpl.nasa.gov/go/opera/products/dist-product-suite/' target='_blank'>https://www.jpl.nasa.gov/go/opera/products/dist-product-suite/<\/a><\/p><p><span>For more information about the GLAD project, visit <\/span><a href='https://glad.umd.edu/' target='_blank'>https://glad.umd.edu/<\/a><\/p><p><span>For more information about the Caltech-JPL ARIA project, visit <\/span><a href='https://aria.jpl.nasa.gov' target='_blank'>https://aria.jpl.nasa.gov<\/a><\/p><p><span>For more information about the JPL OPERA project, visit <\/span><a href='https://www.jpl.nasa.gov/go/opera/' target='_blank'>https://www.jpl.nasa.gov/go/opera/<\/a><\/p><p><span style='font-weight:bold;'>Product POCs:<\/span><\/p><p><span>Alexander Handwerger (alexander.handwerger@jpl.nasa.gov)<\/span><\/p><p><span>Cole Speed (cole.speed@jpl.nasa.gov)<\/span><\/p><p><span>Mary Grace Bato (bato@jpl.nasa.gov)<\/span><\/p><p><span>Ines Fenni (ines.fenni@jpl.nasa.gov)<\/span><\/p><p><span style='font-weight:bold;'>Credits:<\/span><\/p><p><span>The product contains modified Copernicus Sentinel data (2025) and is produced as part of the OPERA project, which is funded by NASA to address remote sensing needs identified by the Satellite Needs Working Group. Managed by NASA's Jet Propulsion Laboratory, OPERA funds and manages the DIST-ALERT-HLS product developed and produced by the Global Land Analysis and Discovery (GLAD) laboratory at the University of Maryland.<\/span><\/p><p><span>NASA JPL-Caltech-UMD ARIA/OPERA Team<\/span><\/p><p><span>==================<\/span><\/p><p><span>Last Update 04 November 2025<\/span><\/p><\/div><\/div><\/div>",
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  "Comments": "Summary:The Advanced Rapid Imaging and Analysis (ARIA) and Observational Products for End-Users from Remote Sensing Analysis (OPERA) teams at the Jet Propulsion Laboratory, California Institute of Technology created maps of surface disturbance caused by Hurricane Melissa in Jamaica on October 28, 2025 using the OPERA Disturbance Alert from Harmonized Landsat Sentinel-2 (DIST-ALERT-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 surface disturbance. The ARIA-share website has always focused on posting preliminary results as fast as possible for disaster response. All information is provisional for use under emergency response guidelines. These data are provided with absolutely no warranty of any kind.  Use at your own risk.OPERA DIST-ALERT-HLSThe Disturbance product (DIST) maps per pixel vegetation disturbance (specifically, vegetation cover loss) from the Harmonized Landsat Sentinel-2 (HLS) scenes. We provide the maximum vegetation anomaly value (VEG-ANOM-MAX) layer. All provided layers have been temporally filtered to include only disturbance detected following the start of Hurricane Melissa (starting October 28, 2025). Images are provided as GeoTIFF files. Note: Artifacts caused by clouds and cloud shadows are present in the product. The DIST-HLS product will eventually be updated to address these issues as more cloud-free data becomes available.VEG-ANOM-MAX:Difference between historical and current year observed vegetation cover at the date of maximum decrease (vegetation loss of 0-100%). This layer can be used to threshold vegetation disturbance per a given sensitivity (e.g. disturbance of &gt;=20% vegetation cover loss). The sum of the historical percent vegetation and the anomaly value will be the vegetation cover estimate for the current year.  Layer values:0-100: Maximum loss of percent vegetation (suggested color: white to red gradient)255: No data (suggested color: transparent)Satellite/Sensor:MultiSpectral Instrument (MSI) on European Space Agency's (ESA) Copernicus Sentinel-2A/B satellites and Operational Land Imager 2 (OLI-2) on NASA's Landsat 8/9 satellite.Resolution:30 metersThe DIST-ALERT-HLS products included here have these flags:255 represents ''No Data'' and is based on the Fmask layer of the source HLS granule.  OPERA DIST-ALERT-HLS data availability:The post-processed products are available to download at https://aria-share.jpl.nasa.gov/20251028_Hurricane_Melissa/DIST-HLS/The OPERA DIST-HLS products have been in production since January 2022, are freely distributed to the public via NASA's Land Processes Distributed Active Archive Center (LP DAAC), and can be downloaded through NASA's Earthdata search. For more information about the Surface Disturbance product suite, please refer to the DIST Product page: https://www.jpl.nasa.gov/go/opera/products/dist-product-suite/For more information about the GLAD project, visit https://glad.umd.edu/For more information about the Caltech-JPL ARIA project, visit https://aria.jpl.nasa.gov For more information about the JPL OPERA project, visit https://www.jpl.nasa.gov/go/opera/ Product POCs:Alexander Handwerger (alexander.handwerger@jpl.nasa.gov)Cole Speed (cole.speed@jpl.nasa.gov)Mary Grace Bato (bato@jpl.nasa.gov)Ines Fenni (ines.fenni@jpl.nasa.gov)Credits:The product contains modified Copernicus Sentinel data (2025) and is produced as part of the OPERA project, which is funded by NASA to address remote sensing needs identified by the Satellite Needs Working Group. Managed by NASA's Jet Propulsion Laboratory, OPERA funds and manages the DIST-ALERT-HLS product developed and produced by the Global Land Analysis and Discovery (GLAD) laboratory at the University of Maryland.NASA JPL-Caltech-UMD ARIA/OPERA Team==================Last Update 04 November 2025",
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