All* Landsat standard data products are processed using the Level-1 Product Generation System (LPGS) with the following parameters applied:
MAP (North-up) image orientation
* A very small number of Landsat TM scenes are processed using the National Land Archive Production System (NLAPS). You can reveiw the details about the differences between LPGS and NLAPS processed data. A listing of NLAPS-processed scenes is available.
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.
The processing levels for Pre-Collection and Collection 1 data are shown in the table below. See the Landsat Collections webpage for a full description of all Collection 1 changes. See this FAQ for information on how to determine the processing level of a Landsat scene.
The Standard Terrain Correction (L1TP or L1T) and Systematic Terrain Correction (L1GT or L1Gt) products incorporate a Digital Elevation Model (DEM) for topographic accuracy. The Standard Terrain Correction (L1TP or L1T) products also utilize ground control points for additional geometric accuracy.