Two images from a radar satellite are often a lot better than one. These orbiting sensors see through wind, rain and darkness and have another unique strength: combine two or more radar images of the same site together and a new dimension of information becomes accessible, including signs of otherwise invisible millimetre-scale ground motion.
This technique is called radar interferometry, known as InSAR for short. ESA has been at the forefront of its development because the Agency has been operating Synthetic Aperture Radar (SAR) satellites for the last 14 years, first with ERS-1, then ERS-2 and latterly Envisat. This week ESRIN, ESA’s Centre for Earth Observation in Frascati near Rome, hosted the fifth ESA International FRINGE Workshop, a gathering devoted to the latest advances and applications in InSAR from the ERS and Envisat missions.
More than 250 researchers from 31 countries are attending the workshop which began on Monday 28 November and will end on 2 December. Principal Investigators have presented more than 80 papers and 85 posters, and dedicated sessions are taking place on specialist subjects including thematic mapping, terrain motion, volcanoes, ice and snow, landslides, earthquakes and tectonics.
Mariangela D’Acunto | alfa
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