USGS EROS Archive - Landsat Archives - Landsat 7 Enhanced Thematic Mapper Plus Collection 2 Level-1 Data

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Dataset Citation

Please cite this dataset in the following manner: 

Earth Resources Observation and Science (EROS) Center. (2020). Landsat 7 Enhanced Thematic Mapper Plus Level-1, Collection 2 [dataset]. U.S. Geological Survey. https://doi.org/10.5066/P9TU80IG
 

Sources/Usage: Public Domain. View Media Details

From April 1999 to April 2022, the Landsat Enhanced Thematic Mapper Plus (ETM+) sensor onboard the Landsat 7 satellite acquired images of the Earth on a 16-day repeat cycle referenced to the Worldwide Reference System-2.  After a series of spacecraft burns performed throughout the month of April 2022 to lower the satellite’s orbit by 8 kilometers, the sensor acquired nominal science images until January 19, 2024.  The Landsat 7 Extended Science Mission webpage provides more details about the data acquired April 2022 – January 2024. 

Landsat 7 scenes collected since May 30, 2003 have data gaps due to the Scan Line Corrector (SLC) failure, and are categorized as SLC-off. 

Delivered Landsat 7 ETM+ Level-1 products consist of eight spectral bands with a spatial resolution of 30 meters for bands 1 to 7 and 15-meters for the panchromatic band 8.  All bands can collect one of two gain settings (high or low) for increased radiometric sensitivity and dynamic range, while Band 6 collects both high and low gain for all scenes.  Approximate scene size is 170 km north-south by 183 km east-west (106 mi by 114 mi).

A Quality Assurance (QA.tif) band is also included in the Level-1 product.  This file provides bit information regarding conditions that may affect the accuracy and usability of a given pixel – clouds, water, or snow, for example.

Standard Processing Parameters

All Landsat 7 ETM+ Collection 2 Level-1 data are processed using the Landsat Product Generation System (LPGS) with the following parameters applied:

Landsat 7 ETM+ Collection 2  Level-1 Data

Landsat Tiers are the inventory structure for Landsat Collection 2 Level-1 data and are based on data quality and level of processing.  All scenes in the Landsat archive are assigned to a Collection category.  The purpose of Collection categories is to support rapid and easy identification of suitable scenes for time-series pixel level analysis.  These data have well-characterized radiometric quality and are cross calibrated ​among the different Landsat sensors.​​​

Collection Category (Tier)

• Tier 1 (T1) - Contains the highest quality Level-1 Terrain Precision (L1TP) data considered suitable for time-series analysis.  The georegistration is consistent and within prescribed tolerances [<12m root mean square error (RMSE)]
• Tier 2 (T2) - Contains L1TP scenes not meeting Tier 1 criteria and all Systematic Terrain (L1GT) and Geometric Systematic (L1GS) scenes.  Users interested in Tier 2 scenes can evaluate the RMSE and other properties to determine suitability for use in their applications and studies.
• Real-Time (RT) - Contains newly-acquired Landsat 7 scenes, which require a period of evaluation and calibration adjustment after acquisition but are processed immediately based on preliminary calibration coefficients, assigned to the temporary RT Tier, and made available for download.   When definitive calibration information becomes available (approximately 26 days), these scenes are reprocessed, assigned to the appropriate Tier 1 or Tier 2 category, and removed from the RT Tier.
   
•      Visit the Landsat Levels of Processing webpage to learn more about how georegistration is applied to Landsat Level-1 products.

The Landsat Collection 2 webpage contains additional details about Landsat Collection 2 Level-1 products. 

Coverage Maps

Coverage Maps indicating the availability of Landsat 7 Collection products are available for download.

• Download shapefile
• Download kml 

Additional Information

• Landsat Collection 2
• Project Documentation 
• Landsat FAQs
• USGS Landsat - Earth Observation Satellites Fact Sheet
• Landsat 7 Data Users Handbook 

Access Data

Landsat 7 Collection 2 Level-1 scenes held in the USGS archive can be searched using EarthExplorer.  On EarthExplorer, Landsat 7 scenes can be found under the Landsat menu in the “Landsat Collection 2 Level-1” section, in the “Landsat 7 ETM+ C2 L1” dataset.  Landsat Full Resolution Browse Images can also be downloaded from this location. 

The Landsat Data Access summary table provides information about all Landsat Collection 2 data access options.

The Global Land Surveys (GLS) collections of 1975, 1990, 2000, 2005, and 2010 contain specific terrain precision corrected Landsat 7 scenes.  These datasets can also be found on EarthExplorer.

Data Citation History

The preferred citation for this dataset was revised in 2024 to improve accuracy and alignment with USGS Fundamental Science Practices. The dataset digital object identifier (DOI) and version did not change. 

Please cite this dataset in the following manner:

Earth Resources Observation and Science (EROS) Center. (2020). Landsat 7 Enhanced Thematic Mapper Plus Level-1, Collection 2 [dataset]. U.S. Geological Survey. https://doi.org/10.5066/P9TU80IG

The previously used citation shown below is provided here for historical reference only:
Earth Resources Observation And Science (EROS) Center. (1999). Collection-2 Landsat 7 Enhanced Thematic Mapper Plus (ETM+) Level-1 Data Products [dataset]. U.S. Geological Survey. https://doi.org/10.5066/P9TU80IG

Landsat 7 ETM+ Collection 2 Level-2 Digital Object Identifier (DOI) number: 10.5066/P9C7I13B