OPERA Land Surface Disturbance Annual from Harmonized Landsat Sentinel-2 product (Version 1)

Description

The Observational Products for End-Users from Remote Sensing Analysis (OPERA) Land Surface Disturbance Annual from Harmonized Landsat Sentinel-2 (HLS) product Version 1 summarizes the DIST-ALERT data product into an annual vegetation disturbance data product. Vegetation disturbance is mapped when there is an indicated decrease in vegetation cover within an HLS Version 2 pixel. The product also provides auxiliary generic disturbance information as determined from the variations of the reflectance through the DIST-ALERT scenes to provide information about more general disturbance trends. The DIST-ANN product tracks changes at the annual scale, aggregating changes identified in the DIST-ALERT product. Only confirmed disturbances from the associated year are reported together with the date of initial disturbance. As confirmed disturbances are determined using subsequent cloud-free observations to determine if the loss detections persist, the required number of HLS scenes depends on visibility of the target. Due to this dependency, summarizing the DIST-ALERT in the DIST-ANN product will have some latency contingent on the algorithmic calibration and is detailed in the Algorithm Theoretical Basis Document (ATBD).The OPERA_L3_DIST-ANN-HLS (or DIST-ANN) data product is provided in Cloud Optimized GeoTIFF (COG) format, and each layer is distributed as a separate COG. There are 21 layers contained within the DIST-ANN product: vegetation disturbance status, historical vegetation cover indicator, maximum vegetation cover indicator, maximum vegetation anomaly value, vegetation disturbance confidence layer, date of initial vegetation disturbance, number of detected vegetation loss anomalies, vegetation disturbance duration, date of last observation assessed for vegetation disturbance, and several generic disturbance layers. Each product layer is gridded to the same resolution and tiling system as HLS V2: 30 meter (m) and Military Grid Reference System (MGRS). See the Product Specification Document (PSD) for a more detailed description of the individual layers provided in the DIST-ANN product. The OPERA_L3_DIST-ANN-HLS product contains modified Copernicus Sentinel data (2020-2025).Known Issues

• Additional usage constraints are provided under Section 5 of the Algorithm Theoretical Basis Document (ATBD). Read our doc on how to get AWS Credentials to retrieve this data: https://data.lpdaac.earthdatacloud.nasa.gov/s3credentialsREADME

Update Frequency

From 2022-01-01 to Ongoing (Annual)

License

Creative Commons BY 4.0

Documentation

https://doi.org/10.5067/SNWG/OPERA_L3_DIST-ANN-HLS_V1.001

Managed By

See all datasets managed by NASA.

Contact

Email: lpdaac@usgs.gov. Home Page: https://lpdaac.usgs.gov/

How to Cite

OPERA Land Surface Disturbance Annual from Harmonized Landsat Sentinel-2 product (Version 1) was accessed on DATE from https://registry.opendata.aws/nasa-operal3dist-ann-hlsv1.

Usage Examples

Tutorials

• Visualization and Exploration of OPERA DIST-ANN-HLS Product Layers by C. Speed and M. Grace Bato
  
• Visualizing and Analyzing the OPERA DIST-ANN-HLS Product to Explore Land-Use Change in Brazil by C. Speed and M. Grace Bato
  
• Visualizing and Analyzing the OPERA DIST-ANN-HLS Product to Visualize Wildfire Impact in Northern Quebec by C. Speed and M. Grace Bato