The European remote sensing satellite (ERS) was the European Space Agency's first Earth-observing satellite, injected into a Sun-synchronous polar orbit at a height of 782–785 km.
ERS-1 and ERS–2 were launched into the same orbit in 1991 and 1995 respectively. Their payloads included a synthetic aperture imaging radar, radar altimeter and instruments to measure ocean surface temperature and wind fields.
ERS-2 added an additional sensor for atmospheric ozone monitoring. The two satellites acquired a combined data set extending over two decades.
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