WELDUSWK: Conterminous US Weekly Landsat Composites

NASA's Web-Enabled Landsat Data (WELD) Conterminous United States Weekly (WELDUSWK) dataset provides 30-meter resolution mosaics generated from Landsat Enhanced Thematic Mapper Plus (ETM+) imagery. The weekly composites from 2003 through 2012 include Top of Atmosphere Reflectance, Brightness Temperature, and a derived Normalized Difference Vegetation Index (NDVI). This dataset was decommissioned in 2019, with users directed to newer monthly global GWELD products.

Use Cases

• Monitoring vegetation health and phenology based on weekly NDVI time series.
• Analyzing land surface temperature patterns using weekly brightness temperature data.
• Deriving consistent land cover and biophysical products for regional climate studies.
• Assessing surface dynamics and change detection over a decadal period.

Strengths

• Provides consistent, weekly 30-meter resolution data for a 10-year period (2003-2012).
• Includes derived geophysical products like NDVI alongside raw reflectance and temperature bands.
• Funded by NASA and developed in collaboration with USGS EROS and South Dakota State University.

Limitations

• Dataset is decommissioned (as of December 2, 2019) and superseded by newer versions.
• Platform metadata shows conflicting last-update dates (2012-12-31 vs. 2026-04-09).
• Specific column names and data volume details are not provided in the available metadata.

Provenance

Source

National Aeronautics and Space Administration (NASA), United States Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center, South Dakota State University (SDSU) Geospatial Sciences Center of Excellence (GSCE).

Collection Method

Generated from composited Landsat Enhanced Thematic Mapper Plus (ETM+) mosaics.

Time Range

2003 to 2012

Freshness

The dataset was decommissioned on December 2, 2019. Platform metadata lists a last updated date of 2026-04-09, which likely reflects a metadata update rather than new data.

Geography

Conterminous United States (CONUS)