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Fraser
2003-Sep-30, 10:26 PM
SUMMARY: The European Space Agency's demonstrated the capability of its Envisat Earth monitoring satellite to track the water levels of inland lakes and rivers; spots on the Earth that were previously invisible to previous radar altimetry. The Radar Altimeter 2 on board Envisat sends 1800 radar pulses a second from 800 km altitude and then calculates how long they take to return - this tells the device its exact distance to the planet. A team from pored through the raw Envisat data and figured out a way to extract river water levels by spotting specific kinds of radar echos. ESA will release 12 years of river levels for scientists to study.


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