WELDAKMO.015: Alaska Landsat Composites 2002-2012

NASA's Web-Enabled Landsat Data (WELD) provides 30-meter resolution monthly mosaics of Alaska from 2002 to 2012. The dataset includes Top of Atmosphere Reflectance, Brightness Temperature, and NDVI derived from Landsat ETM+ imagery. It was decommissioned in 2019, with users directed to newer GWELD versions.

Use Cases

• Deriving land cover products from consistent 30-meter reflectance mosaics.
• Assessing regional surface dynamics using monthly NDVI time series.
• Conducting geophysical and biophysical studies based on Top of Atmosphere Reflectance and Brightness Temperature.

Strengths

• Provides consistent, 30-meter resolution data across an 11-year time range (2002-2012).
• Cross-platform presence on datagov and nasa_earthdata signals established importance and use.
• Funded by NASA and developed in collaboration with USGS EROS and SDSU GSCE, indicating authoritative provenance.

Limitations

• Dataset is decommissioned, indicating it is not actively maintained or recommended for new work.
• Conflicting 'last updated' dates across sources (2026-04-10 vs. 2012-11-30) create uncertainty about metadata freshness.
• Specific column names and dataset size/row counts are not provided, limiting precise understanding of structure.

Provenance

Source

National Aeronautics and Space Administration (NASA), in collaboration with USGS EROS and South Dakota State University (SDSU) GSCE.

Collection Method

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

Time Range

2002 to 2012

Freshness

Last updated dates conflict: 2026-04-10 (datagov) and 2012-11-30 (nasa_earthdata).

Geography

Alaska, United States