Frequency dependence of polarization phase difference and polarization index for vegetation covered fields using polarimetric AIRSAR data

摘要

Polarization phase difference (PPD) and polarization index (PI) images were generated using P-, L- and C-bands polarimetric AIRSAR data collected over Mahantango watershed area in Central Pennsylvania during July 1990. Three corn fields were identified in the image for detailed analysis. The mean PPD for corn fields is found to be increasing with increasing wavelength. The vegetation index involving cross and like polarization is better than the vegetation index with only like polarizations.