Enhanced Thematic Mapper Plus (ETM+)

Instrument

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blue arrow Instrument Overview

The Enhanced Thematic Mapper Plus (ETM+) is the main instrument on board Landsat 7 and has been operational since 1999.

ETM+ is an 8-band whiskbroom scanning radiometer consisting of:

  • A primary mirror that sweeps side-to-side (across-track) to produce forward and reverse image scans, and
  • A Scan Line Corrector (SLC) mirror assembly that sweeps forward-to-back to compensate for the forward motion of the spacecraft during integration time. The motion of these mirrors deviates from an ideal line profile, introducing along- and cross-track geometric distortions that require compensation.

The principal functional differences between the ETM+ and the former TM series are the addition of a 15 m resolution panchromatic band and two 8-bit "gain" ranges. The ETM+ adds a 60 m resolution thermal band, replacing the 120 m band on ETM/TM (band Number 6). ETM+ data therefore cover the visible, Near Infra-Red (NIR), shortwave, and Thermal Infra-Red (TIR) spectral bands of the electromagnetic spectrum.

ETM+ Instrument Parameters
Swath Width 185 km
Spatial Resolution 15 m PAN
30 m VNIR/SWIR
60 m TIR

 

Sensor Modes

Landsat operated in the SAM (Scan Angle Monitor) Mode for nominal routine operations. On 1 April 2007, Landsat 7 was switched to the 'backup' BUMPER mode to help correct issues associated with the end of an instruments lifetime. More information on this mode-switch is available in the monthly update from April 2002.

 

TM Band Information

Band No. Wavelength (µm)  
8 0.52 - 0.90 PAN
1 0.45 - 0.52 (VIS, blue)
2 0.53 - 0.61 (VIS, green)
3 0.63 - 0.69 (VIS, red)
4 0.77 - 0.90 NIR
5 1.55 - 1.75 SWIR
7 2.08 - 2.35 SWIR
6 10.4 - 12.5 TIR

blue arrow Data

blue arrow DATA DOWNLOAD

Download data from Landsat-7 mission through the ESA TPM LDS online dissemination System. The data is freely available to registered EO-SSO users.

Watch in real time (less than a minute delay during acquisition) the Landsat 7 and 8 acquisitions over Matera and Kiruna station footprints: Landsat 7 and 8 Real Time Acquisition

blue arrow DATA DESCRIPTION

ESA offers to registered user the access through the Online Dissemination server to the following data collection

blue arrow 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.


Read more

blue arrow Processor Releases

Read more about the processor releases for ETM+.

blue arrow Cal/Val

Calibration allows the traceability of satellite sensor data to physical standards, and provides a routine check on instrument performance.

Validation establishes the link between EO measurements from space to derived data products and measurements on the ground, allowing for the verification of the algorithms, and models used to derive parameters and data products.

Calibration Activities and Reports are available for ETM+.

blue arrow Quality Control Reports

ETM+ Quality Control Reports detail the availability of products, any anomalies and the Pick-up Noise issue that affected some products.