WELDAKLL: Alaska Landsat Composite Pixel Center Coordinates

Alaska is covered by this dataset of 30-meter composite pixel center latitude and longitude points. It provides systematic mosaics from Landsat Enhanced Thematic Mapper Plus (ETM+) imagery for the years 2002 to 2012. The data supports the derivation of land cover and geophysical products for regional surface dynamics assessments.

Use Cases

• Deriving land cover maps based on 30-meter Landsat ETM+ composites.
• Regional assessments of surface dynamics using consistent geophysical and biophysical products.
• Geolocation correction and analysis using actual center pixel latitude and longitude points.

Strengths

• Provides a consistent 30-meter resolution time series from 2002 to 2012.
• Systematically generated mosaics for regional assessments of surface dynamics.
• Cross-platform presence on NASA Earthdata and Data.gov signals its foundational importance.

Limitations

• Dataset was decommissioned on December 2, 2019, and users are directed to newer GWELD versions.
• Specific column names and dataset size (rows, file size) are not provided in the available metadata.
• Conflicting 'last updated' dates exist between sources (2012-12-31 and 2026-04-10).

Provenance

Source

A collaboration between NASA, USGS EROS Center, and South Dakota State University GSCE.

Collection Method

Systematic generation of 30m composited Landsat ETM+ mosaics.

Time Range

2002 to 2012

Freshness

The dataset was decommissioned in 2019, with metadata updates noted as recently as 2026-04-10.

Geography

Alaska, United States