LANDSAT-7 SATELLITE IMAGERY

The optical imagery obtained from imagery satellite LANDSAT-7 ETM+ has been used in a variety of sectors including governmental, educational and commercial applications. Launching in April 15, 1999, LANDSAT-7 has provided over 16 years’ worth of satellite imagery which has been extensively used for long-term land use change detection.
Its multispectral sensor provides imagery with a Ground Sampling Distance (GSD) ranging from 15m to 60m (see table 1) with a 16 day revisit time.
Unfortunately, the Scan Line Corrector (SLC) on the ETM+ instrument failed on May 31, 2003: the instrument responsible for compensating for the satellites forward motion. This has rendered approximately 30% of each image missing.
  • LANDSAT-7 Satellite Imagery - Ashgabat, Turkmenistan
  • LANDSAT-7 Satellite Imagery - Byrd Glacier, Antarctica
  • LANDSAT-7 Satellite Imagery - Collective Farms, Kazakhstan
  • LANDSAT-7 Satellite Imagery - Grand Cannyon, USA
  • LANDSAT-7 Satellite Imagery - Lake district, England
  • LANDSAT-7 Satellite Imagery - Rome, Italy
© Landsat imagery courtesy of NASA Goddard Space Flight Center and U.S. Geological Survey

OVERVIEW OF LANDSAT-7

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Parameter LANDSAT-7
Orbit Altitude 705km
Spectral Bands Eight spectral bands (450-12500nm) with one panchromatic (15m), three visible (30m), one near-infrared (30m), two SWIR (30m) and one thermal (60m) band
Swath Width 185km
Ground Sampling Distance (GSD) 15-30km
Launch/Life Expectancy 1999 - 2020
Revisit Time 16 days
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INFORMATION

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