High resolution measurements of scattering in wheat canopies - implications for crop parameter retrieval

Details High resolution measurements of scattering in wheat canopies - implications for crop parameter retrieval High resolution measurements of scattering in wheat canopies - implications for crop parameter retrieval

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.475...57b&link_type=abstract

In: Proceedings of the Third International Symposium on Retrieval of Bio- and Geophysical Parameters from SAR Data for Land Appl

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Agriculture, Land Cover

Scientific paper

Polarimetric X and C band measurements by the University of Sheffield GB-SAR indoor system provide three-dimensional images of the scattering processes in wheat canopies, at resolutions of around a wavelength (3-6 cm). The scattering shows a pronounced layered structure, with strong returns from the soil and the flag leaves, and in some cases a second leaf layer. Differential attenuation at H and V polarisation, due to the predominantly vertical structure of the wheat stems and flag leaves, gives rise to marked effects. Direct return from the canopy exceeds the soil return at larger incidence angles at VV and for both frequencies, but is comparable to or less than the soil return in all other cases. At HV, the apparent ground return is probably due to a double bounce mechanism, and volume scattering is never the dominent term. Direct sensing of the crop canopy is most effective at X band, VV and large incidence angles, under which conditions the return is dominated by the flag leaf layer. Field measurements with the outdoor GB-SAR system suggest however, that for sensitivity to biomass and reduced susceptibility to disturbances by rainfall, a two channel C band system operating at a medium range of incidence angles is preferred.

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