Regional Applications of Crop Phenology Proportion Index on Fractional Crop Area Estimation Using MO DIS Data

MODIS data have proven useful for various vegetation applications at large scales. Considering the mismatched spatial resolution between MODIS and agricultural field size, it is important to map crop areas at the sub-pixel level of MODIS. The Crop Phenology Proportion Index (CPPI) model has shown promises in deriving fractional crop areas in typical cultivated areas. In this study, we applied the CPPI model to map fractional winter wheat areas for the entire Jiangsu Province in China. We employed the National Agricultural Census Data to stratify counties of different cultivation intensities and selected samples for stratified counties. We evaluated the model performance and found that an overall accuracy of 82.3% for the estimated winter wheat areas. The results demonstrated the potential of the CPPI model for estimating fractional crop areas across large geographical regions.