[Parameters: Topic='SPECTRAL/ENGINEERING', Term='VISIBLE WAVELENGTHS', Variable_Level_1='VISIBLE IMAGERY']
Web-enabled Landsat Data SetsEntry ID: USGS_WELD
Abstract: The Web-enabled Landsat Data (WELD) project is collaboration between the United States Geological Survey (USGS) Earth Resources Observation and Science (EROS) Center and academic partner South Dakota State University Geographic Information Science Center of Excellence (GIScCE). It is funded by NASA's Making Earth System Data Records for Use in Research Environments (MEaSUREs), with significant ... USGS cost sharing.
WELD generates 30-meter composites of Landsat 7 Enhanced Thematic Mapper Plus (ETM+) terrain corrected (Level 1T) mosaics at weekly, monthly, seasonal and annual periods for the conterminous United States (CONUS) and Alaska. These mosaics provide consistent data that can be used to derive land cover as well as geo-physical and biophysical products for regional assessment of surface dynamics and to study Earth system functioning.
WELD (Version 1.3) monthly, seasonal, and annual products are generated images acquired from December 2007 to November 2008.
[Summary provided by the USGS.]
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Data Set Citation
Dataset Originator/Creator: Roy, D.P., Ju, J., Kline, K., Scaramuzza, P.L., Kovalskyy, V., Hansen, M.C., Loveland, T.R., Vermote, E.F., Zhang, C.
Dataset Title: Web-enabled Landsat Data Sets
Dataset Release Date: 2008
Dataset Release Place: U.S.
Dataset Publisher: United States Geological Survey (USGS), South Dakota State University Geographic Information Science Center of Excellence
Version: 1.3Online Resource: http://landsat.usgs.gov/WELD.php
Start Date: 2007-12-01Stop Date: 2008-11-31
Latitude Resolution: 30 m
Longitude Resolution: 30 m
Horizontal Resolution Range: 30 meters - < 100 meters
HUMAN DIMENSIONS > ENVIRONMENTAL GOVERNANCE/MANAGEMENT > LAND MANAGEMENT > LAND USE/LAND COVER CLASSIFICATION
LAND SURFACE > LAND USE/LAND COVER
LAND SURFACE > TOPOGRAPHY > LANDFORMS
LAND SURFACE > TOPOGRAPHY > TOPOGRAPHICAL RELIEF
SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > INFRARED IMAGERY
SPECTRAL/ENGINEERING > VISIBLE WAVELENGTHS > VISIBLE IMAGERY
ISO Topic Category
Quality The WELD processing is being prototyped at the GIScCE with planned systematic processing to be undertaken at EROS. The WELD processing is being developed to improve the consistency and quality of Landsat ETM+ data through a fusion with contemporaneous MODIS land products. The WELD data products will be updated in near real time and made available to the user community through a dedicated internet distribution interface. More years of composited mosaic products and future versions with refined processing and content will be provided, most notably atmospheric correction, radiometric/BRDF normalization, cloud and ETM+ SLC-off gap filling, and land cover characterization.
Access Constraints None
Use Constraints There is no guarantee of warranty concerning the accuracy of these data. Users should be aware that temporal changes may have occurred since the data was collected and that some parts of these data may no longer represent actual surface conditions. Users should not use these data for critical applications without a full awareness of their limitations. Acknowledgement of the originating agencies would be appreciated in products derived from these data. Any user who modifies the data set is obligated to describe the types of modifications they perform. User specifically agrees not to misrepresent the data set, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer.
Data Set Progress
Distribution Media: Online
Distribution Format: HDF
Fees: All Landsat data in the EROS archive are downloadable at no cost to users.
Email: David.Roy at sdstate.edu
1021 Medary Ave, Wecota Hall Box 506B
Province or State: SD
Postal Code: 57007
Role: DIF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Roy, D.P., Ju, J., Kline, K., Scaramuzza, P.L., Kovalskyy, V., Hansen, M.C., Loveland, T.R., Vermote, E.F., Zhang, C., 2010, Web-enabled Landsat Data (WELD): Landsat ETM+ Composited Mosaics of the Conterminous United States, Remote Sensing of Environment, 114: 35-49.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2010-09-29
Last DIF Revision Date: 2013-05-14