Landsat-7 - Earth Online

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About Landsat-7

The Landsat programme is a joint USGS and NASA-led enterprise for Earth observation that represents the world's longest running system of satellites for moderate-resolution optical remote sensing for land, coastal areas and shallow waters.

Landsat-7 was launched in 1999 and remains operational. The Scan Line Corrector failed in 2003, however, causing data acquisitions to be degraded.

*Mission Parameters*
Launch Date	15 April 1999
Orbit Height	705 km
Orbit Type	Sun-synchronous polar
Repeat Cycle	16 days
End of Service	Still operational
Inclination	98.2°
Orbit Period	99 min
Equatorial Crossing Time	10:00 a.m
Onboard sensors provided under TPM	Enhanced Thematic Mapper Plus (ETM+)

Landsat-7 is part of ESA's Third Party Missions Programme, in which ESA has an agreement to distribute data products from the missions.

Landsat-7 Objectives

Landsat-7 continues the goal of the Landsat programme to image repetitively Earth's land and coastal areas with the aim of monitoring changes to those areas over time. The satellite continues to provide data continuity for the Thematic Mapper aboard Landsat-4 and 5, utilising an enhanced version of the instrument.

Landsat-7 Instruments

Landsat 7 ETM+ instrument — The **Enhanced Thematic Mapper Plus** (ETM+) 8-band whiskbroom scanning radiometer is the main instrument on board Landsat-7.
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Landsat-7 Data

DATA DESCRIPTION

Through the Online Dissemination server, ESA offers registered users access to the following Landsat-7 data collections:

DATA TOOLS

Landsat-7 data can be processed using the HEDAVI tool. The HEDAVI (HEritage DAta Visualisation) service enables users to discover a wealth of heritage data from ESA's ERS and Envisat missions, as well as from Landsat-5 and Landsat-7.
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DATA QUALITY

Quality Control is monitoring routinely the status of the spacecraft (payload and platform) and to check if the derived products meet the quality requirements along mission life-time. Learn about the quality control activities for the ETM instrument:

ETM quality control

Landsat-7 INSTRUMENTS

Landsat-7 DATA

Landsat-7 TOOLS