期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：1998
卷号：XXXII Part 1
页码：245-255
出版社：Copernicus Publications
摘要：Satellite radar 4ata is of particll;lar interest for cr~p mo~tori?g as the probability of obtainingdata from optical sensor dunng the growth penod of nee IS very low. At present SyntheticAperture Radar (SAR) data is available from ERS and RADARSAT satellites. Studies carriedout using SAR data from these have established the feasibility of rice crop monitoring usingmult~-date. SAR data. Two t~ three date ERS SAR data gave ~~tter. than 90 per c~ntclassificatiOn accuracy for nee crop grown under lowland condition m the eastern Indianregion. As such lowland rice, which includes shallow, intermediate, deep water and irrigatedrice cultures accounts for more than 90 per cent of the rice lands of Asia. Estimates could beobtained as early as 15-25 days of transplantation. In addition to this it was feasible todiscriminate the early maturing and late maturing rice varieties. This information is required foraccurate yield estimation. Two date data of Radarsat Standard beam Shallow mode (S7) gavebetter than 95 per cent classification accuracy for irrigated rice. It was feasible to obtain the areaestimation as early as 15 days after transplanting of the crop. The HH polarisation ofRADARSAT SAR data gave high accuracy of classification of water bodies than that of the VVpolarised SAR data of ERS. The separability of rice from other land cover classes likewater/water logged area, forest and home steads etc. was high in multi date SAR data. Theseclasses in general confuse with rice in optical data. The backscatter derived using temporal SARdata showed a distinct profile associated with the crop growth. This indicates the feasibility ofgrowth modelling for y1eld forecasting using SAR data alone.Thus, it was observed that C band SAR data available from the present microwave satellites isuseful for timely estimation of area and monitoring the growth of rice crop. The present paperhighlights these findings from the studies carried out using SAR data for different rice growmgregions in India.
关键词：SAR; ERS; RADARSAT; S7 beam; rice; temporal; backscatter; cultural types;classification; accuracy; area; production
