Landsat Collection

Landsat Collection 2 Level-2 Science Products

Landsat Collection 2 includes scene-based global Level-2 surface reflectance and surface temperature science products.

Landsat Collection 2 Level-2 Science Products

Left: Landsat Level-1 Top of Atmosphere image. Center: Landsat Level-2 Surface Reflectance image. Right:Landsat Level-2 Surface Temperature image. The data was acquired on May 3, 2013 (path 140/row 41).

Return to Collection 2 Overview

Go to Collection 2 Level-1 Information 

 

Landsat Level-2 science products are generated from Collection 2 Level-1 inputs that meet the <76 degrees Solar Zenith Angle constraint and include the required auxiliary data inputs to generate a scientifically viable product.

Landsat 8 Operational Land Imager (OLI) surface reflectance products are generated using the Land Surface Reflectance Code (LaSRC) algorithm (Version 1.5.0). Landsat 4-5 Thematic Mapper (TM) and Landsat 7 Enhanced Thematic Mapper (ETM+) surface reflectance products are generated using the Landsat Ecosystem Disturbance Adaptive Processing System (LEDAPS) algorithm (Version 3.4.0).

Landsat 4-8 surface temperature products are generated using the Landsat surface temperature algorithm (Version 1.3.0), developed in cooperation with the Rochester Institute of Technology and NASA Jet Propulsion Laboratory.

 

Surface Reflectance

Surface reflectance (unitless) measures the fraction of incoming solar radiation that is reflected from the Earth's surface to the Landsat sensor. The LEDAPS and LaSRC surface reflectance algorithms correct for the temporally, spatially and spectrally varying scattering and absorbing effects of atmospheric gases, aerosols, and water vapor, which is necessary to reliably characterize the Earth’s land surface. 

Collection 2 Surface Reflectance Enhancements
  Collection 2 Surface Reflectance Collection 1 Surface Reflectance
(on demand, U.S. ARD)
Fill Value 0 -9999
Scaling Factor 0.0000275 + -0.2 0.0001
Data Type Unsigned 16 bit integer Signed 16 bit integer
Valid Range 1-65455 0-10000
Quality Band L1 QA_Pixel
L1 QA_RADSAT
L2 SR_QA_AEROSOL
Level-2 PIXELQA
Level-2 RADSATQA
Level-2 SRAEROSOLQA

Visit the Landsat Surface Reflectance webpage for additional information and documentation.

 

Surface Temperature

Surface Temperature measures the Earth’s surface temperature (units Kelvin) and is an important geophysical parameter in global energy balance studies and hydrologic modeling. Surface temperature is also useful for monitoring crop and vegetation health, and extreme heat events such as natural disasters (e.g., volcanic eruptions, wildfires), and urban heat island effects. A surface temperature product cannot be generated if auxiliary data is missing, although a surface reflectance product will continue to be generated.

Collection 2 Surface Temperature Enhancements
  Collection 2 Surface Temperature Collection 1 Surface Temperature
(on demand, U.S. ARD)
Fill Value 0 -9999
Scaling Factor 0.00341802 + 149.0 0.1
Data Type Unsigned 16-bit integer Signed 16-bit integer
Valid Range 1-65535 1500-3730
Atmospheric
Reanalysis Source
GEOS-5 FP-IT (2000-present)
MERRA-2 (1982-1999)
MERRA-2
Quality Band L1 QA_Pixel
L1 QA_RADSAT
L2 SR_QA_AEROSOL
Level-2 PIXELQA
Level-2 RADSATQA
Level-2 SRAEROSOLQA

Visit the Landsat Surface Temperature webpage for additional information and documentation.

 

Metadata

The following metadata file specifications are included in Collection 2 products to facilitate consistency, machine-to-machine scripting and rapid querying of the Landsat archive:

  • Material Library File (MTL) (Object Description Language-based) format (currently offered)
  • Extensible Markup Language (XML)

 

Atmospheric Auxiliary Data

Landsat Level-2 surface reflectance and surface temperature processing require atmospheric auxiliary data input from external USGS data sources. USGS retrieves data from the data source and extracts parameters specific to Landsat Collection 2 Level-2 processing. These subsets are available for download for users who wish to perform Level-2 processing. It is not necessary for users to download atmospheric auxiliary data to use the Collection 2 Level-2 products.

Visit the Landsat Collection 2 Atmospheric Auxiliary page for more information about the datasets used in Collection 2 Level-2 processing.

 

Data Availability

Landsat 4-8 Collection 2 Level-2 data will become available mid-2020.

Landsat 1-5 Level-2 Multispectral Scanner surface reflectance products will only become available upon the maturity of an operational atmospheric compensation algorithm which satisfies the USGS Landsat program requirements.

Collection 1 based products, U.S. Landsat ARD and Level-3 data processing and downloads will remain available for at least one year after Collection 2 is publicly released.

 

Data Access

Landsat Collection 2 Level-1 and Level-2 data will be available to download from EarthExplorer and LandsatLook. The USGS Landsat no-cost and open data policy remains intact since its inception in 2008. LandsatLook’s new capabilities and public availability will be announced mid-2020.

Visit the Landsat Data Access webpage for additional data access and download options. 

 

Documentation

Users are encouraged to reference the COG Data Format Control Book (DFCB) for a detailed description of the image, product and metadata files. Together with the instrument specific Level-1 DFCBs, the COG DFCB provides the user with a comprehensive overview of the new Landsat Collection 2 products.

Landsat Cloud Optimized GeoTIFF (COG) Data Format Control Book

Level-1 Documents

Level-2 Documents

 

Sample Products

Collection 2 Level-1 and Level-2 sample data products are available for download from the Landsat Sample Products web page.