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NASA Web-Enabled Landsat Data - Alaska Monthly (WELDAKMO)

   NASA WELD - Alaska Monthly: 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 Alaska monthly product suite.

The WELD Alaska Monthly products are defined simply with respect to each calendar year by the days in each month.

Data Set Characteristics

Projection Albers Equal Area
Datum World Geodetic System 84 (WGS84)
Min/Max Longitude -175.000000 to -125.000000
Min/Max Latitude 50.00000 to 72.000000
Tile size 5000 x 5000
Pixel size 30m
Tile volume 45GB
Tiles 162
First standard parallel 55.0°
Second standard parallel 65.0°
Longitude of central meridian -154.0°
Latitude of projection origin 50.0°
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