Early View article: “Coastal Flood Inundation Monitoring with Satellite C-band and L-band Synthetic Aperture Radar Data,” by Elijah Ramsey III, Amina Rangoonwala, and Terri Bannister.
Satellite Synthetic Aperture Radar (SAR) was evaluated as a method to operationally monitor the occurrence and distribution of storm- and tidal-related flooding of spatially extensive coastal marshes within the north-central Gulf of Mexico. Maps representing the occurrence of marsh surface inundation were created from available Advanced Land Observation Satellite (ALOS) Phased Array type L-Band SAR (PALSAR) (L-band) data and Environmental Satellite (ENVISAT) Advanced SAR (ASAR) (C-band) data during 2006-2009 covering 500 km of the Louisiana coastal zone. Mapping was primarily based on a decrease in backscatter between reference and target scenes, and as an extension of previous studies, the flood inundation mapping performance was assessed by the degree of correspondence between inundation mapping and inland water levels.
Their research suggests that although both PALSAR- and ASAR-based inundation mapping performance would benefit from higher frequency collections, ASAR-based performance would have a substantially higher improvement potential. In the case of ASAR in particular, a higher collection frequency would provide more choices leading to the possibility of obtaining consistently higher-quality reference scenes leading to improved inundation mapping performance. In addition, results suggest that the application of more consistent SAR imaging parameters, such as look direction and coverage would increase SAR inundation mapping performance, primarily by increasing the consistency in look angle from scene to scene. With these strategic collection changes, SAR inundation mapping could provide an improved representation of the coastal flooding dynamism.
[Please note: I have quoted and paraphrased freely from the article, but the interpretation is my own.]