Interpretation and model analysis of MAESTRO 1 Flevoland data

Abstract

A model, based on the Radiative Transfer Theory and the Matrix Doubling algorithm, is tested with agricultural and forest radar returns measured by the JPL AIRSAR sensor over the Flevoland site (The Netherlands) at P, L and C bands.The test is generally valid, although some discrepancies are noted in the absolute P band values of U O and not all the input parameters were obtainable from ground measurements. The model is also used to interpret the experimental results and to estimate the relative importance of the different scattering contributions.

Multitemporal C- and L-band polarimetric signatures of crops

“…6-7) is observed, especially for -band. This high backscatter is in accordance with the model results in [5], where a radiative transfer model shows that the high backscatter comes from direct backscattering from the leaves, and that the backscatter increases with frequency. In our case, we have dB at -band and dB at -band for the July acquisitions, and the increase of 6-7 dB from -to -band corresponds well with that observed in [5], although conditions differ.…”

“…11(b) and (f)] is nearly identical. Model results [5] indicate that the VV backscatter at -band is dominated by backscattering from the stems, whereas the VV backscatter at -band is dominated by the leaves. Potato leaves are smaller than beets leaves.…”

“…Data from these experiments have been analyzed using scattering models. Models based on the radiative transfer approach have been used to study data for wheat [4]- [6], corn [5], [7], rape [4], rice [8], sunflowers [9], sugar beets [5], and potatoes [5]. Also, models based on the wave approach have been used for wheat [10], corn [11], grass [12], and soybeans [13].…”

The discrimination between crude-oil spills and monomolecular sea slicks by an airborne lidar

“…The purpose of this section is to discuss how the various electromagnetic scattering mechanisms can be highlighted from simple representations of the radar data on selected two-parameter planes. The interpretation we Downloaded by [Carnegie Mellon University] give of the observed patterns is in general consistent with the results of several theoretical models (Ulaby et al 1990, Chauhan et al 1991, McDonald et al 1991, Karam et al 1992, and, in particular, is supported by results of simulations carried out by the Tor Vergata multiple scattering model (Ferrazzoli et al 1991, Ferrazzoli andGuerriero 1994).…”

“…!<Pvv is considerably high (table I) and we have observed that its histograms peak towards n, thus suggesting an even-bounce scattering mechanism. Theoretical model results (Ferrazzoli and Guerriero 1994) point out that for a canopy of vertical cylinders simulating corn stalks, the dependence of back scattering intensity on polarization is set by a balance between scattering from the stalks, attenuation by the canopy and reflection from the ground. At L band, the corn stalks effectively scatter downward both vertical and horizontal polarizations, so that the attenuation by the canopy and the upward reflection from the ground, both of which damp the VV return, cause HH backscatter to prevail.…”