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NASA Web-Enabled Landsat Data - CONUS Weekly (WELDUSWK)

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   NASA WELD – CONUS Weekly: 2003

The Web-Enabled Landsat Data (WELD) project funded by the National Aeronautics and Space Administration (NASA) is a collaboration between the United States Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center and the South Dakota State University Geographic Information Science Center of Excellence (GIScCE). 

WELD systematically generates 30m composited Landsat Enhanced Thematic Mapper Plus (ETM+) mosaics of the United States and Alaska from 2003 – 2012 to provide consistent data for deriving land cover, geophysical, biophysical products for regional assessments of surface dynamics for effective studying of Earth system functioning. 

The Land Processes Distributed Active Archive Center (LP DAAC) is responsible for archive and distribution of NASA WELD, which includes the CONUS weekly product suite.

The WELD CONUS Weekly products are defined simply with respect to each calendar year, and as consecutive 7-day products with Week01: January 1 to January 7, Week02: January 8 to January 14, Week 52: December 24 to December 30 (non-leap years) or  December 23 to December 29 (leap years), Week 53: December 30th to December 31st (leap years) or December 31st (non-leap years).

Data Set Characteristics

Projection Albers Equal Area
Datum World Geodetic System 84 (WGS84)
Min/Max Longitude -127.000000 to -65.000000
Min/Max Latitude 23.00000 to 52.000000
Tile size 5000 x 5000
Pixel size 30m
Tile volume 15GB
Tiles 501
First standard parallel 29.5º
Second standard parallel 45.5º
Longitude of central meridian -96.0º
Latitude of projection origin 23.0º
False Easting 0.0
False Northing 0.0

Additional Information:

WELD Product Information –

Data Use and Citation Policies

For information on how to cite USGS data plus guidance on usage restrictions,
please see our Data Citations and Use page at

Any use of trade, firm, or product names is for descriptive purposes only and
does not imply endorsement by the U.S. Government.

Contact Information for User Assistance

U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001

Phone Number: 605-594-6151
Toll Free: 800-252-4547
Fax: 605-594-6589


Business Hours: Monday thru Friday, 8:00 a.m. to 4:00 p.m., Central Time