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*Coming soon in 2018*

The U.S. Geological Survey (USGS) will soon make available Landsat Level- 3 Dynamic Surface Water Extent data for Landsat 4-5 Thematic Mapper (TM), Landsat 7 Enhanced Thematic Mapper Plus (ETM+), and Landsat 8 Operational Land Imager (OLI) that are consistently processed to the highest scientific standards and level of processing required for direct use in monitoring and assessing landscape change.

Landsat Dynamic Surface Water Extent contains six acquisition-based raster data products relating to the existence and condition of surface water. All intermediate bands used to produce the Dynamic Surface Water Extent are also provided. Landsat Dynamic Surface Water Extent products are generated from U.S. Landsat 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 U.S. Landsat ARD Data Format Control Book.

The Landsat Dynamic Surface Water Extent product is 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.

 

Product Availability

The Landsat Dynamic Surface Water Extent product will become available for the conterminous U.S., Alaska, and Hawaii and for the following date ranges:

  • Landsat 8 OLI: April 2013 to present
  • Landsat 7 ETM+: July 1999 to present
  • Landsat 5 TM: March 1984 to May 2012
  • Landsat 4 TM: December 1982 to December 1993

Figure 1 Left: Landsat Surface Reflectance image (Landsat 7 bands 5,4,3) and Right: Landsat Dynamic Surface Water  Interpreted Layer with Mask applied (INWM) product for an area within Landsat CONUS ARD tile h005v013 acquired on August 16, 2000. Water presence is shown in blue.

 

Package Content

The Dynamic Surface Water Extent product will include six raster layers and an .xml metadata file relating to the existence and condition of surface water.  Additional product specifications can be found in the Landsat Dynamic Surface Water Extent Product Guide. The Landsat Dynamic Surface Water Extent package includes a metadata file in Extensible Markup Language (.xml) format.

The table below lists the products and filenames that are delivered with the Landsat Dynamic Surface Water Extent product.

Product

Description

Delivered File Name

Approximate File Size (Kbytes)

Diagnostic layer (DIAG)

Provides the results of the five diagnostic tests used to determine the probability of water presence in each pixel.

*_DIAG.tif

3,000

Interpreted layer (INTR)

Provides the recoded results of the five diagnostic tests to identify specific surface water conditions.

*_INTR.tif

2,500

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.

*_INWM.tif

200

Mask (MASK)

Indicates where cloud, cloud shadow, and/or snow are true, or where the percent slope or hillshade thresholds were exceeded.

*_MASK.tif

800

Hillshade (SHADE)

Represents the extent of terrain-produced shadow for each pixel.

*_SHADE.tif

10,000

Percent Slope (SLOPE)

Represents the percent slope of each pixel, where a 100 percent slope equals a 45-degree angle.

*_SLOPE.tif

18,500

 

Caveats and Constraints

Most Landsat Collection 1 Level-1 scenes can be processed to generate a Dynamic Surface Water Extent 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.

 

Data Access

The Landsat Dynamic Surface Water Extent product will be available for download from EarthExplorerThe data will be located under the Landsat category, Landsat Collection 1 Level-3 Science Products subcategory, and listed as Dynamic Surface Water Extent.

 

Documentation

Landsat Dynamic Surface Water Extent Product Guide

Landsat Dynamic Surface Water Extent Algorithm Description Document

 

Citation Information

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 Level 3 Dynamic Surface Water Extent (DSWE) Science Products courtesy of the U.S. Geological Survey.

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.

 

References

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.