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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).

Version Description

Version 1

Product Summary

Platforms
Sentinel-2A,
Sentinel-2B,
Sentinel-2C,
LANDSAT-8,
LANDSAT-9
Instruments
Sentinel-2 MSI,
OLI
Spatial Extent
N: 90 S: -90 E: 180 W: -180
Spatial Resolution
30 Meters x 30 Meters
Geographic Region
GLOBAL LAND
Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2023-01-01 to Present
Temporal Resolution
1 Year
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC)
Global Land Disturbance Mapping for JPL OPERA (Observational Products for End-Users from Remote Sensing Analysis), University of Maryland (UMD/GLAD)
Concept ID
C2519119034-LPCLOUD
Data State
ACTIVE
Processing Level
3
Published
Science Keywords
Land Use/Land Cover,
MECHANICAL DISTURBANCE,
DISTURBANCE

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

Hansen, M. (2024). OPERA Land Surface Disturbance Annual from Harmonized Landsat Sentinel-2 product (Version 1) [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/SNWG/OPERA_L3_DIST-ANN-HLS_V1.001 Date Accessed: 2025-10-30

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
GEN-ANOM-MAX Generic maximum disturbance anomaly value N/A int16 255 255 N/A
GEN-CONF-COUNT Count of confirmed generic disturbance events N/A uint8 255 255 N/A
GEN-CONF-PREV Indicator of generic disturbance from previous year Class Flag uint8 255 255 to 2 N/A
GEN-DIST-CONF Generic Disturbance Confidence Layer N/A int16 -1 -1 N/A
GEN-DIST-COUNT Number of detected spectral anomalies N/A uint8 255 255 to 254 N/A
GEN-DIST-DATE Date of generic initial disturbance anomaly Day int16 -1 -1 N/A
GEN-DIST-DUR Generic disturbance duration Day int16 -1 -1 to 366 N/A
GEN-DIST-STATUS Generic disturbance status Class Flag uint8 255 255 to 10 N/A
GEN-LAST-DATE Date of last observation assessed for generic disturbance Day int16 -1 -1 N/A
VEG-ANOM-MAX Maximum vegetation anomaly value Percent uint8 255 255 to 100 N/A
VEG-CONF-COUNT Count of confirmed vegetation disturbance events N/A uint8 255 255 N/A
VEG-CONF-PREV Indicator of vegetation disturbance from previous year Class Flag uint8 255 255 to 2 N/A
VEG-DIST-CONF Vegetation Disturbance Confidence Layer N/A int16 -1 -1 N/A
VEG-DIST-COUNT Number of detected vegetation loss anomalies N/A uint8 255 255 to 254 N/A
VEG-DIST-DATE Date of initial vegetation disturbance Day int16 -1 -1 N/A
VEG-DIST-DUR Vegetation disturbance duration Day int16 -1 -1 to 366 N/A
VEG-DIST-STATUS Vegetation disturbance status Class Flag uint8 255 255 to 10 N/A
VEG-HIST Historical vegetation cover indicator Percent uint8 255 255 to 200 N/A
VEG-IND-3YR-MIN Minimum three year vegetation cover indicator Percent uint8 255 255 to 100 N/A
VEG-IND-MAX Maximum vegetation cover indicator Percent uint8 255 255 to 100 N/A
VEG-LAST-DATE Date of last observation assessed for vegetation disturbance Day int16 -1 -1 N/A
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