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In 2016, the USGS reorganized the Landsat archive into a tiered collection. This structure ensures that Landsat Level-1 products provide a consistent archive of known data quality to support time-series analyses and data “stacking”, while controlling continuous improvement of the archive and access to all data as they are acquired.

The Collection definition consists of three categories: Tier 1, Tier 2, and Real-Time. Data in Tier 1 meet formal geometric and radiometric quality criteria. Tier 2 do not meet the Tier 1 criteria. The Real-Time Tier contains data immediately after acquisitions that use estimated parameters. Real-Time data are reprocessed and assessed for inclusion into Tier 1 or Tier 2 as soon as final parameters are available.

Landsat Collection 1 consists of Level-1 data products generated from Landsat 8 Operational Land Imager (OLI)/Thermal Infrared Sensor (TIRS), Landsat 7 Enhanced Thematic Mapper Plus (ETM+), Landsat 4-5 Thematic Mapper (TM), and Landsat 1-5 Multispectral Scanner (MSS) instruments.

The implementation of Collections represents a significant change in the management of the Landsat Archive by ensuring consistent quality through time and across instruments, along with additional changes like metadata and file names. Landsat Science Products inherit characteristics of the Landsat Collection 1 Level-1 data products.

Landsat Collection Tiers are the inventory structure for Level-1 data products and are based on data quality and level of processing. The tier definition purpose is to support easier identification of suitable scenes for time-series pixel-level analysis, and provide temporary data that are processed immediately upon downlink to be dispensed quickly in emergency response situations with limited calibration. Tier 1 (T1)

Landsat scenes with the highest available data quality are placed into Tier 1 and are considered suitable for time-series analysis. level 1 education Tier 1 includes Level-1 Precision and Terrain (L1TP) corrected data that have well-characterized radiometry and are inter-calibrated across the different Landsat instruments. The georegistration of Tier 1 scenes is consistent and within prescribed image-to-image tolerances of ≦ 12-meter radial root mean square error (RMSE). Tier 2 (T2)

Landsat scenes not meeting Tier 1 criteria during processing are assigned to Tier 2. school for highest level of education This includes Systematic Terrain (L1GT) and Systematic (L1GS) processed data, as well as any L1TP data that do not meet the Tier 1 specifications due to significant cloud cover, insufficient ground control, and other factors. Users interested in Tier 2 scenes can analyze the RMSE and other properties to determine their suitability. Real-Time (RT)

Newly-acquired Landsat 7 ETM+ and Landsat 8 OLI/TIRS data are processed upon downlink but use predicted ephemeris, initial bumper mode parameters, or initial TIRS line-of-sight model parameters. The data is placed in the Real-Time tier and made available for immediate download. Once the data have been reprocessed with definitive ephemeris, updated bumper mode parameters and refined TIRS parameters, the products are transitioned to either Tier 1 or Tier 2 and removed from the Real-Time tier. The transition delay from Real-Time to Tier 1 or Tier 2 is between 14 and 26 days. The follow-on Real-Time processing for Landsat 7 ETM+ and Landsat 8 OLI/TIRS are described below.

• Landsat 8 TIRS data may not meet specifications for co-registration with OLI. TIRS line-of-sight model parameters are refined based on data acquired during biweekly calibration maneuvers and scenes are updated within 14 to 16 days of acquisition.

Landsat 7 ETM+ acquisitions are processed immediately using predicted ephemeris and initial bumper mode parameters and placed into the Real-Time tier. Shortly after initial processing (about 1 day), the data are reprocessed using definitive ephemeris, but still remain in the Real-Time tier. During a period of instrument trending/characterization (about 26 days), calibration parameter adjustments finalize the geometric correction model, and the data are reprocessed again and placed into Tier 1 or Tier 2.

The Tier designation (T1, T2, RT) is visible at the end of the Landsat Product Identifier, as shown in the examples below. It is also provided as an additional metadata field in EarthExplorer. Note: Historical Landsat 4-5 TM and Landsat 7 ETM+ data received from International Ground Stations supporting the Landsat Global Archive Consolidation effort are placed in either Tier 1 or Tier 2 after Collection 1 processing.

Along with information inherited from the Landsat Pre-Collection scene ID, the new Landsat Collection 1 product identifier includes the updated processing levels, processing date, Collection number, and Collection tier category (noted in red in the graphic below).

The Landsat scene ID remains in the metadata file (MTL.txt) delivered with the Level-1 data product, and will also be visible and searchable (along with the new Collection 1 Landsat Product Identifier) in the online metadata on EarthExplorer. Changes Applied During Collection 1 Processing

" No-Payload Correction Data (PCD)" scenes. Over 260,000 Landsat 5 TM scenes acquired between January 1986 and December 1999, originally downlinked to international ground stations, lack the necessary PCD. Until recently, these scenes failed Landsat Level-1 data processing and could not be added to the Landsat data inventory. However, recent processing algorithm changes made it possible to process the majority of these scenes into the Landsat Collection 1 data inventory and make them available for download.

MSS data have historically proved challenging to Landsat Level-1 processing systems. define education level A significant amount of the data have missing scan lines, and others are not full-data nominal scenes. The effort to process Landsat MSS data into Collection 1 required data processing changes to influence the geometric and radiometric accuracy of the Level-1 data products. The Landsat 1-5 MSS Collection 1 page provides in-depth information about the work done to successfully process Landsat MSS data into the Collection 1 archive.

Calibration Parameter Files (CPF) provide radiometric and geometric coefficients needed for processing of raw, uncorrected Landsat image data. Each timeframe specific CPF contains calibration coefficients that have been adjusted to correct for the time varying performance of the sensor.