Landsat Mission

Landsat Level-1 Processing Details

Landsat standard data products are processed using the Landsat Product Generation System (LPGS) with standart parameters applied, and 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.

  • GeoTIFF output format
  • Cubic Convolution (CC) resampling method
  • 30-meter (TM, ETM+) 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

The processing levels for Landsat Collection 1 Level-1  data are shown in the table below.  Visit this web page for information on how to determine the processing level of a Landsat scene.

Landsat Level-1 Processing Levels
Processing Level Description 
Terrain Precision Correction (L1TP) Radiometrically calibrated and orthorectified using ground control points (GCPs) and digital elevation model (DEM) data to correct for relief displacement.The highest quality Level-1 products suitable for pixel-level time series analysis.  GCPs used for L1TP correction are derived from the Global Land Survey 2000 (GLS2000) data set. 
Systematic Terrain Correction (L1GT) Radiometrically calibrated with systematic geometric corrections applied using the spacecraft ephemeris data and DEM data to correct for relief displacement.  Note: L1GT are the highest level of radiometric calibration and systematic correction possible for Landsat 7 and Landsat 8 scenes collected over Antarctica. The L1GT product uses the high-resolution Radarsat Antarctic Mapping Project (RAMP) Version 2 as the elevation correction source.
Geometric Systematic Correction (L1GS)  Radiometrically calibration with only systematic geometric corrections applied using the spacecraft ephemeris data.

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 SRTMNEDCDEDDTEDGTOPO 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.