NASA Web-Enabled Landsat Data CONUS 30m Composites over Monthly Periods V001

WELDUSMO.015 was decommissioned on December 2, 2019. Users are encouraged to use the improved monthly Global Web-Enabled Landsat Data (GWELD) Version 3, 3.1, and 3.2 datasets.

NASA’s Web-Enabled Landsat Data (WELD) are generated from composited 30 meter (m) Landsat Enhanced Thematic Mapper Plus (ETM+) mosaics of the United States and Alaska from 2002 to 2012. These mosaics provide consistent data to derive land cover, geophysical, and biophysical products for regional assessments of surface dynamics for effective study of Earth system function. The WELD Conterminous (CONUS) United States Monthly products include Top of Atmosphere (TOA) Reflectance and Brightness Temperature, along with the Normalized Difference Vegetation Index (NDVI) generated from Band 3 and Band 4 TOA Reflectance. These products are distributed in Hierarchical Data Format 4 (HDF4).

WELDUSMO products are defined by a calendar month (e.g. January, February, March, etc.) for December 2002 through November 2012.

The WELD project is funded by the National Aeronautics and Space Administration (NASA) and is a collaboration between the United States Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center and the South Dakota State University (SDSU) Geospatial Sciences Center of Excellence (GSCE).

Known Issues

  • WELD Version 1.5 known issues can be found in the WELD Version 1.5 User Guide.

Data and Resources

Additional Info

Field Value
Maintainer Earthdata Forum
Last Updated August 24, 2026, 17:32 (UTC)
Created June 12, 2025, 23:15 (UTC)
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id 33b316cb-586e-4292-a019-97880659745d
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
identifier 10.5067/MEASURES/WELD/WELDUSMO.001
license https://www.usa.gov/government-works
modified 2026-08-17T22:15:58Z
programCode {026:000}
publisher LP DAAC;SD-STATE/GISCCE
resource-type Dataset
source_datajson_identifier true
source_hash 9ecc37fba9c2f3a2f83fb2ee7a224f9e64d18f9ed793096042c24616c37b9061
source_schema_version 1.1
spatial ["CARTESIAN", [{"NorthBoundingCoordinate": 52, "WestBoundingCoordinate": -127, "EastBoundingCoordinate": -65, "SouthBoundingCoordinate": 23}]]
temporal 2002-12-01/2012-11-30
theme {"Earth Science"}