The Web-Enabled Landsat Data (WELD) 5-year Land Cover Land Use Change (LCLUC) is a composite of 30 meter (m) land use land change product for the contiguous United States (CONUS). The data were generated from five years of consecutive growing season WELD weekly composite inputs from April 15, 2006 to November 17, 2010. WELD data are created using Landsat Thematic Mapper Plus (ETM+) Terrain Corrected data. This product includes data about tree cover loss and bare ground gain, which are composited over the five year period. WELD LCLUC 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).
Version 1.5 is the original version.
|File Size||~37 MB|
|Temporal Extent||2006-04-15 to 2010-11-17|
|Coordinate System||Albers Equal Area|
|Datum||World Geodetic System (WGS84)|
|Geographic Dimensions||150 km x 150 km|
|Number of Science Dataset (SDS) Layers||12|
|Columns/Rows||5000 x 5000|
|Pixel Size||30 m|
|SDS Name||Description||Units||Data Type||Fill Value||No Data Value||Valid Range||Scale Factor|
|LCLUC_Tree Cover||Tree Canopy cover estimated over five annual growing seasons||Percent||8-bit unsigned integer||255||N/A||0 to 100||N/A|
|LCLUC_TREE_COVER_DQAPRO||Data Quality Assessment layer for tree cover||Quality Flag||8-bit unsigned integer||255||N/A||0 to 4||N/A|
|LCLUC_TREE_COVER_DQASTD||Data Quality Assessment layer for Tree Canopy Cover||Percent||8-bit unsigned integer||255||N/A||0 to 100||N/A|
|LCLUC_BARE_GROUND||Peak growing season Bare Ground cover estimated over five annual growing seasons||Percent||8-bit unsigned integer||255||N/A||0 to 100||N/A|
|LCLUC_BARE_GROUND_DQASTD||The Data Quality Assessment layer for Bare Ground cover||Percent||8-bit unsigned integer||255||N/A||0 to 100||N/A|
|LCLUC_WATER_SURFACE||Growing season Water Surface estimated over 5 annual growing seasons||Percent||8-bit unsigned integer||255||N/A||0 to 100||N/A|
|LCLUC_WATER_SURFACE_DQAPRO||The Data Quality Assessment layer for water surface||Quality Flag||8-bit unsigned integer||255||N/A||0 to 4||N/A|
|LCLUC_SNOW_AND_ICE||Growing season Snow and Ice estimated over 5 annual growing seasons||Percent||8-bit unsigned integer||255||N/A||0 to 100||N/A|
|LCLUC_SNOW_AND_ICE_DQAPRO||The Data Quality Assessment layer for snow and ice||Quality Flag||8-bit unsigned integer||255||N/A||0 to 4||N/A|
|LCLUC_NUMBER_OF_GOOD_ACQUISITIONS||Number of good (not cloudy) acquisitions over 5 annual growing seasons||Number||8-bit unsigned integer||255||N/A||0 to 254||N/A|
|LCLUC_TREE_COVER_LOSS¹||Forest loss (yes or no) over the 5-year period||N/A||8-bit unsigned integer||-32768||N/A||0, 6017 to 10046||N/A|
|LCLUC_BARE_GROUND_GAIN¹||Bare ground gain (yes or no) over the 5-year period||N/A||8-bit unsigned integer||-32768||N/A||0, 6017 to 10046||N/A|
¹Forest loss and bare ground gain over the 5-year period are coded dates where 0 represents no forest loss or no ground gain over the 5-year period. Positive values store the week of the detected forest loss or bare ground gain where the thousands place represents the year of the 2000 decade and tens represents the week within the given year (e.g., 8034 represents year 2008, week 34).
|0||High confidence trees or no trees||High confidence water or land||High confidence snow and ice or no snow and ice|
|1||Medium confidence trees||Medium confidence water||Medium confidence snow and ice|
|2||Low confidence trees or no trees||Low confidence water or land||Low confidence snow and ice and no snow and ice|
|3||Medium confidence no trees||Medium confidence land||Medium confidence no snow and ice|
|4||No confidence/No decision||No confidence/No decision||No confidence/No decision|
WELD Version 1.5 product quality information can be found on the WELD Project website.
WELD Version 1.5 known issues can be found on the WELD Project website.