National Land Cover Database (NLCD)
MRLC Terrain Corrected Dataset Description
The Multi-Resolution Land Characteristics (MRLC) Consortium was originally formed in 1992 in order to meet the needs of several federal agencies (USGS, EPA, NOAA, and USFS) for Landsat 5 imagery, and land-cover information. The on-going need for current Landsat 7 data, land-cover and other geospatial data within the federal government culminated in reforming the MRLC Consortium in 2001 (called MRLC 2001).
The MRLC 2001 strategy includes:
The MRLC members recommend that the National land cover data assessment be coincident with the decadal national population census.
Data from Landsat 7 (launch successfully on April 15, 1999) is being primarily used for MRLC 2001. Landsat 7 data have 3 significant radiometric improvements over Landsat 5. The first is inclusion of a 15-meter resolution panchromatic (pan) band. Second, resolution of the thermal band (1040 - 1250 nm) will be improved from 120 to 60 meters. Third, the instrument artifacts that caused striping patterns in Landsat 4 and 5 data are removed up-front in Landsat 7 data using rigorous radiometric calibration procedures. Some Landsat 5 data are included in the MRLC archive to augment the Landsat 7 coverage.
MRLC 2001 pre-processing specifications include:
Access to the Landsat 7 scenes purchased by the MRLC 2001 can be found at the Glovis website (http://glovis.usgs.gov), set Selecting Collection to Landsat Science, then choose either NLCD/MTBS Radiance or NLCD/MTBS Reflectance to select the available scenes. These data may also be accessed by using the query tools at the MRLC Scene Library (http://www.mrlc.gov/download_data.php) webpage.
For additional information contact: