IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Model investigation about the potential of C band SAR in herbaceous wetlands flood monitoring
Autor/es:
GRINGS, FRANCISCO MATIAS; FERRAZZOLI, PAOLO; KARSZENBAUM HAYDEE; SALVIA, MARÍA MERCEDES; KANDUS, PATRICIA; JACOBO BERLLES, JULIO; PERNA, PABLO
Revista:
INTERNATIONAL JOURNAL OF REMOTE SENSING
Referencias:
Año: 2008 vol. 29 p. 5361 - 5372
ISSN:
0143-1161
Resumen:
Wetlands are areas where the presence of water at or near the soil surface drives the natural system. Imaging radars (SARs) have distinct characteristics which make them of significant value for monitoring and mapping wetland inundation dynamics. The presence or absence of water (which has a much higher dielectric constant than dry or wet soil) in wetlands may significantly alter the signal detected from these areas depending on the dominant vegetation type, its density and height. The objective of this paper is to present our current research efforts to explain and correctly simulate the radar response of wetland vegetation/inundation mixtures, and use simulations as an aid for retrieval applications. The radar response of junco marshes under different flood conditions and vegetation stages is analyzed using a set of 13 multipolarization ENVISAT ASAR scenes acquired over the Paraná River Delta marshes during the period 2003-2005. The main aspect of the approach followed is the simulation of SAR wave interactions with vegetation and water, using an adapted and improved version of the EM model developed at Tor Vergata University. Obtained results indicate that with the refined EM model, it is possible to represent with a good accuracy VV and HH SAR responses of junco marshes for a variety of environmental conditions. Further work and data are needed to explain measured HV backscattering. The general agreement obtained between simulations and observations permitted the development of a simple retrieval scheme, and estimates of water level below the canopy were obtained for different environmental conditions.  RMS errors of  forward simulations and retrievals are reported and discussed.