In order to provide a scientific basis for rice yield estimation and improve the accuracy of yield estimation in Zhejiang Province, regionalization indices for rice yield estimation by remote sensing (RS) in the province were determined by considering the special features of yield estimation by RS,and based on analysis of the natural conditions of Zhejiang Province.The indices determined included rice cropping system,agroclimate,landform,surface feature structure and rice yield level,where rice planting system was considered as the main one.Then regionalization for rice yield estimation by RS was completed by spatial neighboring analysis with the Geographical Information System (GIS) technology combined with using of tree algorithm.The province was divided into two regions,i.e.,the single-cropping rice region which was subdivided into 3 regions including those in mountains of northwest Zhejiang,water network area of north Zhejiang and mountains of south Zhejiang,and double-cropping rice region which was subdivided into 5 regions including those on plain of north Zhejiang,coastal plains and hills of southeast Zhejiang,Jin-Qu Basin of middle Zhejiang,hills of east Zhejiang,and hills and mountains of northwest Zhejiang.This regionalization took the county borders as the region boundaries,kept the regions connective and made the administrative regions integrity and,then,could meet the requirements of rice yield estimation by RS,showing that the results were quite satisfying.
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