NASA Web-Enabled Landsat Data CONUS Latitude/Longitude

PI: David Roy

WELDUSLL.015 was decommissioned on December 2, 2019. Users are encouraged to use the improved monthly and annual Global Web-Enabled Landsat Data (GWELD) Version 3.1 (GWELDMO.031 and GWELDYR.031) datasets and the USGS U.S. Landsat Analysis Ready Data Level-2 Data Product (Landsat ARD).


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 as well as geophysical and biophysical products for regional assessments of surface dynamics for effective study of Earth system function. The Conterminous (CONUS) United States Latitude/Longitude (WELDUSLL) products provide the geographic latitude and longitude for the center of each 30 meter (m) pixel within a tile of WELD data. WELDUSLL 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).

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Improvements/Changes from Previous Versions

Version 1.5 is the original version.

Collection and Granule


Characteristic Description
CollectionMEaSUREs WELD and GWELD
File Size~309 MB
Temporal ResolutionOther
Temporal Extent2002-12-01 to 2012-11-30
Spatial ExtentUnited States (CONUS)
Coordinate SystemAlbers Equal Area
DatumWorld Geodetic System (WGS84)
File FormatHDF4
Geographic Dimensions150 km x 150 km


Characteristic Description
Number of Science Dataset (SDS) Layers2
Columns/Rows5000 x 5000
Pixel Size30 m

Layers / Variables

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Longitude Center Longitude of each 30 m pixel Degree 64-bit floating point N/A N/A N/A N/A
Latitude Center Latitude of each 30 m pixel Degree 64-bit floating point N/A N/A N/A N/A

Product Quality

WELD Version 1.5 product quality information can be found in section 6 of the WELD ATBD.

Known Issues

WELD Version 1.5 known issues can be found on the page 21 of the WELD Version 1.5 User Guide.

About the image

NASA Web-Enabled Landsat CONUS WELD Tile system over CONUS.

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User Guide
Algorithm Theoretical Basis Document (ATBD)

Using the Data

Access Data



When using this data product in a publication, please include the following citations in addition to the data product citation provided above:

Roy, D.P., Ju, J., Kline, K., Scaramuzza, P.L., Kovalskyy, V., Hansen, M., Loveland, T.R., Vermote, E., and Zhang, C., 2010, Web-enabled Landsat Data (WELD)—Landsat ETM+ composited mosaics of the conterminous United States: Remote Sensing of Environment, v. 114, no. 1, p. 35-49, at http://dx.doi.org/10.1016/j.rse.2009.08.011.

If you use a WELD product generated graphic or browse image please, insert the text "WELD" somewhere clearly visible within or below the graphic or image.