What is Landsat 7 ETM+ SLC-off data?

Landsat 7 ETM+ SLC-off data refers to all Landsat 7 images collected after May 31, 2003, when the Scan Line Corrector (SLC) failed. These products have data gaps, but are still useful and maintain the same radiometric and geometric corrections as data collected prior to the SLC failure.

See the Landsat 7 website for information about the SLC-off data products.

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What are Landsat 7 SLC-off Gap Mask files?

Band-specific gap mask files are included with every Landsat 7 Scan Line Corrector (SLC)-off Level-1 data product. These ancillary data identify the location of all pixels affected by the original data gaps in the primary SLC-off scene. The gap mask is provided as a series of individual band files, in compressed (GZIP) GeoTIFF format. [scald=76195...

Why do Landsat 7 Level-1 products contain two thermal bands?

Landsat 7 acquires thermal data in two bands from one detector in both high (Band 6H) and low (Band 6L) gain. The difference in gain settings is important to different types of studies (i.e., clouds vs. deserts). Aside from the resolution differences and saturation on the high and low ends, the two bands provide the same Digital Numbers (DN) for...

What Landsat data products are available?

There are several Landsat data products that are useful for science applications and land use/land change studies: Landsat Collections Level 1 - Ensures that the data in the Landsat Level-1 archive are consistent in processing and data quality to support time-series analyses and data stacking. Each Level-1 data product includes individual spectral...

Does the Landsat 7 Scan Line Corrector (SLC)-off artifact affect Landsat Collections tier designation?

The Landsat 7 SLC-off artifact does not change how the data are placed into Landsat Collection tiers, as tier classifications are determined by the radiometric and geometric accuracy of each scene. Learn more: Landsat Collections Landsat Data Access

What are some known issues that users might find in Landsat data?

A number of artifacts and anomalies can happen to any remote sensing data. Banding, dropped scan lines, and detector failures are only a few of the anomalies that can be seen in Landsat data. Go to Landsat Known Issues for details about anomalies that have been discovered and investigated.

What is the Landsat satellite program and why is it important?

The Landsat Program is a series of Earth-observing satellite missions jointly managed by NASA and the U.S. Geological Survey. On July 23, 1972, in cooperation with NASA, the Earth Resources Technology Satellite (ERTS-1) was launched. It was later renamed Landsat 1. Additional Landsat satellites followed in the 1970s and 1980s. Landsat 7 was...

What are the best Landsat spectral bands for use in my research?

The Spectral Characteristics Viewer is an interactive tool that can be used to visualize how the bands--or channels--of different satellite sensors measure the intensity of the many wavelengths (colors) of light. This is also known as the relative spectral response (RSR). By overlaying the spectral curves from different features (spectra), one can...
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Date published: April 17, 2018

Free, Open Landsat Data Unleashed the Power of Remote Sensing a Decade Ago

In the old days, before 2008, a view of planet Earth from space often came at a cost.

Date published: December 15, 2004

USGS Offers New Landsat 7 Gap-Filled Product

The U.S. Geological Survey (USGS) has completed development of a major new product enhancement for Landsat 7 Enhanced Thematic Mapper Plus (ETM+) data captured after the Scan Line Corrector (SLC) anomaly in May of 2003. 

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June 30, 2018

Daily Operations of Landsat 7

What it takes each day to keep Landsat 7 operating smoothly. Hear the stories from inside the L7 Mission Operation Center.

Image shows a satellite view of Rotterdam Harbor
December 22, 2016

Landsat 7 View of Rotterdam Harbor

This Landsat 7 view of Rotterdam harbor, taken on September 28, 2001, predates the beginning of the Maasvlakte 2 port expansion project. Credit: USGS/NASA Landsat Program.

March 13, 2008

What is Landsat 7?

Listen to hear the answer.

Illustration of the Landsat 7 Scan Line Corrector (SLC) Failure
January 30, 2008

Illustration of the Landsat 7 Scan Line Corrector (SLC) Failure

Illustration of the Landsat 7 Scan Line Corrector (SLC) Failure.

SLC-Off showing showing satellite image with parallel bands of missing image; and SLC-On gap mask with correlating blue bands.

Sample SLC-Off to SLC-On gap mask

Left: Sample SLC-Off image; Right: SLC gap mask

A Landsat 7 SLC-off Scene Example

A Landsat 7 SLC-off Scene Example

A Landsat 7 SLC-off Scene Example