Discrimination of Rice crop from RISAT-1 Hybrid Polarimetric Data
ISRO’s indigenous active microwave satellite RISAT-1 provides unique hybrid polarimetric SAR (RH,RV) data in FRS-1 mode. A study of the potential application of this data for rice crop estimation was done in Achanta mandal of West Godavari district, Andhra Pradesh. The data corresponding to reproductive stage of the rice crop was analyzed. The data was subjected to Raney hybrid polarimetric decomposition to understand the contribution of various backscattering mechanisms in the rice crop. The decomposition parameters were subjected to supervised minimum distance classification for rice crop discrimination. A comparison was made with spatial distribution of rice crop derived from in-season Resourcesat-2 LISS-IV data. The extent of agreement in spatial distribution was observed to be 85%. The commission error in RISAT-1 data was observed due to similar scattering mechanisms from plantations and peripheries of settlements. The study has shown the potential of single date FRS-1 hybrid polarimetric data for rice crop discrimination. Rabi Crop Prospects Mapping – Bharatpur District, Rajasthan is shown in the Figure.