Systematic investigation on the effect of dew and interception on multifrequency and multipolarimetric radar backscatter signals

Details Systematic investigation on the effect of dew and interception on multifrequency and multipolarimetric radar backscatter signals Systematic investigation on the effect of dew and interception on multifrequency and multipolarimetric radar backscatter signals

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.475...99r&link_type=abstract

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

Statistics

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Agriculture, Land Cover

Scientific paper

This paper presents the first results of the TerraDew project. The investigation focus on the effect of dew and interception on the radar backscatter signal of agricultural vegetation. The impact differ with respect to frequency, polarization and crop type. The strongest influence on the radar signal is found at the cross-polarized L-band. No impact of free vegetation water was determined for L-VV-band. At C-band the backscatter variations after a rain event strongly depends on the vegetation structure and the growth stage. The impact due to dew is independent from vegetation type. At X-band the backscatter varies after rain in contingent on the surface structure of the vegetation stand. No significant effect on the radar signal is found for dew at X-band. Furthermore the changes in scattering mechanism due to wet vegetation were investigated. The diurnal variations in polarimetric parameters extracted by the Cloude target decomposition theorem are low.

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