WELDLCLUC v015

NASA Web-Enabled Landsat Data 5-Year Land Cover Land Use Change


PI: Matthew Hansen, David Roy

Description

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).

Characteristics

Improvements/Changes from Previous Versions

Version 1.5 is the original version.

Collection and Granule

Collection

Characteristic Description
CollectionMEaSUREs WELD
DOI10.5067/MEaSUREs/WELD/WELDLCLUC.001
File Size~37 MB
Temporal ResolutionMulti-Year
Temporal Extent2006-04-15 to 2010-11-17
Spatial ExtentCONUS
Coordinate SystemAlbers Equal Area
DatumWorld Geodetic System (WGS84)
File FormatHDF4
Geographic Dimensions150 km x 150 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers12
Columns/Rows5000 x 5000
Pixel Size30 m

Layers

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).

Level of Confidence for Quality Assessment Layers

Quality Flag LCLUC_TREE_COVER_DQAPRO LCLUC_WATER_SURFACE_DQAPRO LCLUC_SNOW_AND_ICE_DQAPRO
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

Product Quality

WELD Version 1.5 product quality information can be found on the WELD Project website.

Known Issues

WELD Version 1.5 known issues can be found on the WELD Project website.

Documentation

Using the Data

Tools

Citation

DOI: 10.5067/MEaSUREs/WELD/WELDLCLUC.001

About the Image

Land Cover Land Use Change WELD Tree Cover data over Yosemite National Park, California, United States, 2006 to 2010.