NOTE: Landsat Collection 1 Level-3 science products are no longer available to download from the USGS as of December 30, 2022.
Landsat Collection 2 remains available. Please use the links below to return to Landsat Collection 2 information.
Return to Landsat Dynamic Surface Water Extent Products Overview
NOTE: Landsat Collection 1 Level-3 science products are no longer available to download from the USGS as of December 30, 2022. The information on this webpage is for reference only.
Landsat Collection 1 (C1) Level-3 Dynamic Surface Water Extent (DSWE) products provide raster layers that represent surface water inundation per-pixel in Landsat 4-8 data.
Landsat C1 DSWE products contain six acquisition-based raster data products relating to the existence and condition of surface water. All intermediate bands used to produce DSWE products are also provided.
Available for Landsat 4-5 Thematic Mapper (TM), Landsat 7 Enhanced Thematic Mapper Plus (ETM+), and Landsat 8 Operational Land Imager (OLI), Landsat C1 DSWE products are generated from Landsat Collection 1 U.S. Analysis Ready Data (ARD) Surface Reflectance data, and use the cloud, cloud shadow, and snow information provided in the “PIXELQA” band described in detail in the Landsat Collection 1 U.S. ARD Data Format Control Book.
Landsat C1 DSWE products are processed to 30-meter spatial resolution in Albers Equal Area (AEA) projection using the World Geodetic System 1984 (WGS84) datum and gridded to a common tiling scheme.
Landsat C1 DSWE products are available for the conterminous U.S., Alaska, and Hawaii and for the following date ranges:
- Landsat 8 OLI: April 2013 to December 31, 2021*
- Landsat 7 ETM+: July 1999 to December 31, 2021*
- Landsat 5 TM: March 1984 to May 2012
Landsat 4 TM: November 1982 to July 1993
*As of January 1, 2022, newly-acquired Landsat data were processed into Landsat Collection 2 only.
Landsat C1 DSWE products include six raster layers and an .xml metadata file relating to the existence and condition of surface water. Additional product specifications are located in the Landsat Collection 1 Dynamic Surface Water Extent Product Guide. The Landsat C1 DSWE package includes a metadata file in Extensible Markup Language (.xml) format.
The list below describes the products and filenames that are delivered with the Landsat C1 DSWE package.
Diagnostic layer (DIAG): Provides the results of the five diagnostic tests used to determine the probability of water presence in each pixel.
Delivered file name: *_DIAG.tif
Approximate file size: 3 MB
Interpreted layer (INTR): Provides the recoded results of the five diagnostic tests to identify specific surface water conditions.
Delivered file name: *_INTR.tif
Approximate file size: 2.5 MB
Interpreted layer with mask applied (INWM): Similar to the interpreted layer “INTR” but is screened using the mask layer “MASK”. Cloud, cloud shadow, and/or snow are flagged as such. Areas flagged as percent slope or hillshade in the mask layer are automatically recoded to “0” or “Not water” in this layer.
Delivered file name: *_INWM.tif
Approximate file size: 200 KB
Mask (MASK): Indicates where cloud, cloud shadow, and/or snow are true, or where the percent slope or hillshade thresholds were exceeded.
Delivered file name: *_MASK.tif
Approximate file size: 800 KB
Hillshade (SHADE): Represents the extent of terrain-produced shadow for each pixel.
Delivered file name: *_SHADE.tif
Approximate file size: 9.5 MB
Percent Slope (SLOPE): Represents the percent slope of each pixel, where a 100 percent slope equals a 45-degree angle.
Delivered file name: *_SLOPE.tif
Approximate file size: 18 MB
Caveats and Constraints
Most Landsat Collection 1 Level-1 scenes can be processed to generate a DSWE product. Please refer to Landsat Surface Reflectance caveats and Landsat Surface Reflectance Quality Assessment (QA) bands for pixel-level condition and validity flags and when using the Landsat Dynamic Surface Water Extent product.
Landsat Collection 1 Dynamic Surface Water Extent Product Guide
Landsat Collection 1 Dynamic Surface Water Extent Algorithm Description Document (ADD)
Dynamic Collection 1 Surface Water Extent Digital Object Identifier (DOI): doi.org/10.5066/F7445KQK
There are no restrictions on the use of Landsat Level-3 Science Products. It is not a requirement of data use, but the following citation may be used in publication or presentation materials to acknowledge the USGS as a data source and to credit the original research.
Landsat Collection 1 Level 3 Dynamic Surface Water Extent (DSWE) Science Products courtesy of the U.S. Geological Survey.
Jones, J.W., 2019. Improved Automated Detection of Subpixel-Scale Inundation—Revised Dynamic Surface Water Extent (DSWE) Partial Surface Water Tests. Remote Sens., 11, 374 https://doi.org/10.3390/rs11040374.
Jones, J. W. (2015). Efficient wetland surface water detection and monitoring via Landsat: Comparison with in situ data from the Everglades Depth Estimation Network. Remote Sensing, 7(9), 12503-12538. http://dx.doi.org/10.3390/rs70912503.