The table below shows the Landsat Collections Level-1 processing levels:
|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.
Landsat processing DEM sources include:
|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
|Radiometrically calibration with only systematic geometric corrections applied using the spacecraft ephemeris data.|
The processing level is noted in the metadata (.MTL.txt) file that is delivered with each Landsat Level-1 data product.
|GROUP = METADATA_FILE_INFO
ORIGIN = "Image courtesy of the U.S. Geological Survey"
REQUEST_ID = "2221601291006_00001"
LANDSAT_SCENE_ID = "LT50470272010279PAC01"
LANDSAT_PRODUCT_ID = "LT05_L1TP_047027_20101006_20160512_01_T1"
COLLECTION_NUMBER = 01
FILE_DATE = 2016-05-12T13:14:46Z
STATION_ID = "PAC"
PROCESSING_SOFTWARE_VERSION = "LPGS_12.8.0"
DATA_CATEGORY = "NOMINAL"
END_GROUP = METADATA_FILE_INFO
GROUP = PRODUCT_METADATA
DATA_TYPE = "L1TP"
DATA_TYPE_L0RP = "TMR_LORP"
ELEVATION_SOURCE _ "GLS2000"
OUTPUT_FORMAT = "GEOTIFF"
EPHEMERIS_TYPE = "DEFINITIVE"
SPACECRAFT_ID = "LANDSAT_5"
SENSOR_ID = "TM"
SENSOR_MODE = "BUMPER"
WRS_PATH = 047
WRS_ROW = 027
DATE_ACQUIRED = 2010-10-06
SCENE_CENTER_TIME = "18:51:52.31601902"