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Flood Mapping Using Synthetic Aperture Radar Sensors From Local to Global Scales
Journal
Geophysical Monograph Series
ISSN
00658448
Date Issued
2018-01-01
Author(s)
Dasgupta, Antara
Grimaldi, Stefania
Ramsankaran, R. A.A.J.
Pauwels, Valentijn R.N.
Walker, Jeffrey P.
Chini, Marco
Hostache, Renaud
Matgen, Patrick
Abstract
Synthetic aperture radar (SAR) sensors have emerged as the preferred mode of flood monitoring due to their all-weather, all-day imaging capabilities. Current and upcoming SAR satellites provide high-resolutions and shorter revisit times, which can facilitate effective resource allocation during emergency response. However, the sensitivity of microwaves to surface roughness and the side-looking imaging geometry often result in ambiguity in flood detection. This chapter provides an overview of the challenges and opportunities associated with operational SAR-based flood mapping at multiple scales. The principles of SAR imaging are outlined with reference to flood detection problems, and the state-of-the-art solutions proposed in literature to eliminate these effects are critically discussed. Finally, a few selected case studies that demonstrate the potential of SAR-derived extents for operational flood mapping are presented.
Volume
233