Landsat Missions

Landsat Update - Special Issue 4, May 2017

You are here

Landsat 4-5 TM, Landsat 7, and Landsat 8 Collection 1 Processing Complete

The new Landsat Collection 1 inventory structure has completed processing over 5.6 million Landsat 4-5 Thematic Mapper (TM), Landsat 7 Enhanced Thematic Mapper Plus (ETM+), and Landsat 8 Operational Land Imager/ Thermal Infrared Sensor (OLI/TIRS) scenes from around the world, which are now available for download from EarthExplorer. Landsat 1-5 Multispectral Scanner (MSS) data will be processed into Landsat Collection 1 after data quality analysis and processing level investigations are complete at the end of 2017.


  • Effective April 30, 2017, newly-acquired Landsat 7 ETM+ and Landsat 8 OLI/TIRS scenes are being processed into the Landsat Collection 1 inventory only; Landsat Pre-Collection inventory is no longer being populated with newly-acquired data.
  • Users downloading Landsat Pre-Collection data may experience longer than expected download times.
  • The Landsat Pre-Collection inventory will no longer be available after October 1, 2017. Users are strongly encouraged to use only Landsat Collection 1 data in their applications.


Collection 1 marks an evolutionary step in the Landsat Level-1 structure by providing a consistent archive of known data quality to support time series analysis and data “stacking,” while controlling continuous improvement of the archive and access to all data as they are acquired.

The Landsat Collection 1 definition includes three tiered categories:

  • Tier 1 scenes are calibrated to the highest geometric and radiometric quality to enable data stacking for time series analysis (<12-meter geodetic accuracy).
  • Tier 2 scenes do not meet the Tier 1 criteria due to significant cloud cover, insufficient ground control, and other factors.
  • The Real-Time Tier offers scenes immediately after acquisition using estimated parameters that are reprocessed for inclusion into Tier 1 or Tier 2 when final parameters are available. Real-time data are key for rapid response to natural and man-made disasters around the world.

Additional Landsat Collection 1 Level-1 data product changes include, new Landsat Product Identifiers (a new file naming convention), metadata changes, and the addition of new supporting files including a Quality Assurance (QA) band, solar illumination and sensor view angle coefficients, land-based cloud cover scores, and new life-long gain adjustments for Landsat 4-5 TM sensors.

For more information about Landsat Collection 1 please visit the Landsat Collections webpage or contact User Services at



View Printable: 

Note: Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.


Return to all Landsat Updates


Landsat represents the world's longest continuously acquired collection of space-based moderate-resolution land remote sensing data. Four decades of imagery provides a unique resource for those who work in agriculture, geology, forestry, regional planning, education, mapping, and global change research. Landsat images are also invaluable for emergency response and disaster relief.


Contact Us

Landsat Updates

The Landsat Update is an informal communication tool, prepared periodically and distributed electronically to USGS Landsat partners, to provide information about Landsat activities and related topics of interest.

Accessibility FOIA Privacy Policies and Notices logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Ask Landsat
Page Last Modified: 10/18/18 11:39 am