The table below shows the Landsat Collections 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. 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 (L1GS) |
Radiometrically calibration with only systematic geometric corrections applied using the spacecraft ephemeris data. |
* Layers previously referred to as NED are now branded as 3DEP seamless DEMs, part of the broader suite of products available from The National Map.
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" |
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Does Landsat Level-1 data processing include atmospheric correction?
Landsat Level-1 data are not corrected for atmospheric conditions; however, Landsat Science Products are atmospherically corrected. Learn more: Landsat Level-1 data Landsat U.S. Analysis Ready Data Landsat Level-2 and Level-3 Science Products Landsat Data Access
How do I rescale Landsat Level-1 digital numbers to reflectance, radiance, and brightness temperature?
Landsat Level-1 data can be rescaled to the top of atmosphere (TOA) reflectance and/or radiance using radiometric rescaling coefficients provided in the metadata file (MTL.txt) that is delivered with the Landsat Level-1 product. The MTL file also contains the thermal constants needed to convert thermal band data to TOA brightness temperature (BT). Formulas for these conversions are at Using the...
How is the C Function of Mask algorithm used with Landsat Level-1 data?
The C Function of Mask (CFMask) algorithm populates cloud, cloud confidence, cloud shadow, and snow/ice pixels in the processing of Landsat Collections Level-1 data products, with the results represented as bit-mapped values within the Landsat Collection 1 Level-1 Quality Assessment (QA) Band. CFMask derives from the Function of Mask (FMask), an algorithm written in MATLAB at Boston University and...
I have a list of historical Landsat Level-1 Scene IDs; how can I determine the corresponding Landsat Collections Level-1 Product Identifier?
The historical Landsat Level-1 Scene ID is in the EarthExplorer metadata. After entering a search using the historical Scene ID, the Landsat Level-1 Collection 1 Product Identifier will be returned in the search results. The results can be exported from EarthExplorer in a variety of formats for metadata parsing. We also encourage use of the Bulk Metadata Service to download files that contain both...
What is the naming convention for Landsat Collections Level-1 scenes?
The Landsat Collection 1 Level-1 product identifier includes the Collection processing levels, processing date, collection number, and collection tier category: LXSS_LLLL_PPPRRR_YYYYMMDD_yyyymmdd_CC_TX Where: L = Landsat X = Sensor (“C”=OLI/TIRS combined, “O”=OLI-only, “T”=TIRS-only, “E”=ETM+, “T”=“TM, “M”=MSS) SS = Satellite (”07”=Landsat 7, “08”=Landsat 8) LLL = Processing correction level (L1TP...
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The file sizes of Landsat Collection 1 Level-1 data products are listed below: Sensor Compressed file Uncompressed file Landsat 8 OLI/TIRS 919 MB 1.61 GB Landsat 7 ETM+ 235 MB 785 MB Landsat 4-5 TM 150 MB 500 MB Landsat 1-5 MSS 20 MB 75 MB
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The Sentinel-2A MultiSpectral Instrument (MSI) data has spectral bands very similar to Landsat 8 and 9 (excluding the thermal bands of Thermal Infrared Sensor (TIRS)). All Sentinel-2 data are freely available from the Copernicus Open Access Hub; therefore, users are encouraged to download the data via https://scihub.copernicus.eu/. To learn more about Sentinel data access information please visit...
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