All Landsat standard data products are processed using the Landsat Product Generation System (LPGS) with the following parameters applied:
- GeoTIFF output format
- Cubic Convolution (CC) resampling method
- 30-meter (TM, ETM+, OLI) and 60-meter (MSS) pixel size (reflective bands)
- Universal Transverse Mercator (UTM) map projection (Polar Stereographic projection for scenes with a center latitude greater than or equal to -63.0 degrees)
- World Geodetic System (WGS) 84 datum
MAP (North-up) image orientation
Landsat Level-1 Data Processing Levels
All Landsat Level-1 data products are created using the best available processing level for each particular scene. The processing level used is determined by the existence of ground control points (GCP), elevation data provided by a Digital Elevation Model (DEM), and/or data collected by the spacecraft and sensor (Payload Correction Data (PCD). See the Landsat Geometry page for a full description of the processing levels used and additional information about GCP and DEM updates.
Elevation Sources and Ground Control Points
The Standard Terrain Correction (L1TP) and Systematic Terrain Correction (L1GT) products incorporate a Digital Elevation Model (DEM) for topographic accuracy. The Standard Terrain Correction (L1TP) products also utilize ground control points for additional geometric accuracy.
- Ground control points used for Standard Terrain Correction (L1TP) correction are derived from the GLS2000 data set. DEM sources include SRTM, NED, CDED, DTED, GTOPO 30, and GIMP.
- Systematic Terrain Correction (L1GT) is the highest level of correction possible for L7 and L8 scenes collected over Antarctica. The Ramp V2 DEM is the elevation correction source.