NASA Web-Enabled Landsat Data Alaska 30m Composite Pixel Center Lat/Longs V001

WELDAKLL.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.

The NASA Web-Enabled Landsat Data (WELD) Alaska Latitude Longitude (LL) products are defined with 30 meter (m) composite pixel of the center latitude/longitude point. The NASA WELD data contain a range of values for the minimum/maximum latitude and longitude points. The LL products were created to account for the actual center pixel latitude and longitude points.

WELD systematically generated 30 m composited Landsat Enhanced Thematic Mapper Plus (ETM+) mosaics of the United States and Alaska from 2002 to 2012 to provide consistent data for deriving land cover as well as geophysical and biophysical products for regional assessments of surface dynamics for effective study of Earth system function. WELDAKLL is distributed in Hierarchical Data Format 4 (HDF4).

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 October 27, 2026, 11:57 (UTC)
Created June 12, 2025, 23:15 (UTC)
Identifier 10.5067/MEASURES/WELD/WELDAKLL.001
Modified 2026-10-19T22:16:06Z
Theme {"Earth Science"}
accessLevel public
bureauCode {026:00}
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
harvest_object_id e2d0b09e-b528-4636-9c1e-931505adc6de
harvest_source_id b99e41c6-fe79-4c19-bbc3-9b6c8111bfac
harvest_source_title Science Discovery Engine
license https://www.usa.gov/government-works
programCode {026:000}
publisher LP DAAC;SD-STATE/GISCCE
resource-type Dataset
source_datajson_identifier true
source_hash aacd6f0f71838f9063664237f58c7bb28abf97b5e77eb8d1bcda95337b19ad17
source_schema_version 1.1
spatial ["CARTESIAN", [{"NorthBoundingCoordinate": 72, "WestBoundingCoordinate": -175, "EastBoundingCoordinate": -125, "SouthBoundingCoordinate": 50}]]
temporal 2002-12-01/2012-12-31