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| EarthExplorer |
LANDSAT 1-5 MSS Products
LANDSAT 4-5 TM Products
L7 SLC-ON ETM+ Products
L7 SLC-OFF ETM+ Products
Landsat 1-5 MSS, Landsat 4 TM and some Landsat 5 TM Products - processed by the National Land Archive Production System (NLAPS)
Terrain Correction (Level 1T)
** The Level 1T (L1T) data product provides systematic radiometric and geometric accuracy by incorporating ground control points*, while also employing a Digital Elevation Model (DEM) for topographic accuracy. Geodetic accuracy of the product depends on the accuracy of the ground control points and the resolution of the DEM* used. For locations outside the United States, the accuracy of a terrain-corrected product will depend on the availability of local ground control points (GCPs), as well as the quality of the best available DEM. Scenes that have a quality score of 9 and less than 40 percent cloud cover will be automatically processed, and any archived scene, regardless of cloud cover, can be requested for processing through GloVis or Earth Explorer. *Ground control points used for Level 1Terrain correction come from the GLS2005 data set. DEM data used for terrain correction include SRTM, NED, CDAD, DTED, and GTOPO 30. **While most data available at no charge will be processed as Level 1T (precision and terrain corrected), certain scenes do not have ground control or elevation data necessary for precision or terrain correction, respectively. In these cases, the best level of correction will be applied (Level 1G-systematic).
Systematic Corrected (L1G) The Level 1G (L1G) data product provides systematic radiometric and geometric accuracy, which is derived from data collected by the sensor and spacecraft. The scene will be rotated, aligned, and georeferenced to UTM map projection. Please be aware that TM Level 1G products may require additional image geometric correction and/or co-registration to known ground control points (GCPs).
Landsat 5 TM Products - processed by the Level 1 Product Generation System (LPGS)
Terrain Correction (Level 1T)
** The Level 1T (L1T) data product provides systematic radiometric and geometric accuracy by incorporating ground control points*, while also employing a Digital Elevation Model (DEM) for topographic accuracy. Geodetic accuracy of the product depends on the accuracy of the ground control points and the resolution of the DEM* used. For locations outside the United States, the accuracy of a terrain-corrected product will depend on the availability of local ground control points (GCPs), as well as the quality of the best available DEM. Scenes that have a quality score of 9 and less than 40 percent cloud cover will be automatically processed, and any archived scene, regardless of cloud cover, can be requested for processing through GloVis or Earth Explorer. *Ground control points used for Level 1Terrain correction come from the GLS2005 data set. DEM data used for terrain correction include SRTM, NED, CDAD, DTED, and GTOPO 30. **While most data available at no charge will be processed as Level 1T (precision and terrain corrected), certain scenes do not have ground control or elevation data necessary for precision or terrain correction, respectively. In these cases, the best level of correction will be applied (Level 1G-systematic).
Systematic Correction (Level 1G) The Level 1G (L1G) data product provides systematic radiometric and geometric accuracy, which is derived from data collected by the sensor and spacecraft. The scene will be rotated, aligned, and georeferenced to UTM map projection. Please be aware that TM Level 1G products may require additional image geometric correction and/or co-registration to known ground control points (GCPs).
Landsat 7 ETM+ SLC-on and SLC-off Products - processed by the Level 1 Product Generation System (LPGS)
Standard Terrain Correction (Level 1T)
** The Level 1T (L1T) data product provides systematic radiometric and geometric accuracy by incorporating ground control points, while also employing a Digital Elevation Model (DEM) for topographic accuracy. Geodetic accuracy of the product depends on the accuracy of the ground control points* and the resolution of the DEM* used. Scenes that have a quality score of 9 and less than 40 percent cloud cover will be automatically processed, and any archived scene, regardless of cloud cover, can be requested for processing through GloVis or Earth Explorer. *Ground control points used for Level 1Terrain correction come from the GLS2005 data set. DEM data used for terrain correction include SRTM, NED, CDAD, DTED, and GTOPO 30. **While most data available at no charge will be processed as Level 1T (precision and terrain corrected), certain scenes do not have ground control or elevation data necessary for precision or terrain correction, respectively. In these cases, the best level of correction will be applied (Level 1G-systematic or Level 1Gt-systematic terrain)
Systematic Terrain Correction (Level 1Gt)
The Level 1Gt (L1Gt) data product provides systematic radiometric and geometric accuracy, while also employing a Digital Elevation Model (DEM) for topographic accuracy. Duplicated pixels have been replaced with null values (zero-fill) and the image therefore contains alternating "stripes" of missing data.
Systematic Correction (Level 1G)
The Level 1G (L1G) data product provides systematic radiometric and geometric accuracy, which is derived from data collected by the sensor and spacecraft. The scene will be rotated, aligned, and georeferenced to UTM map projection. Geometric accuracy of the systematically corrected product should be within 250 meters (1 sigma) for low-relief areas at sea level. Duplicated pixels have been replaced with null values (zero-fill) and the image therefore contains alternating "stripes" of missing data.
There are two separate processing systems which are used to generate Landsat products:
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