Extraction of Multi-Crop Planting Areas from MODIS Data

摘要

With a spatial resolution of 250 meters, band 1 and band 2 of MODIS data in red and near-infrared spectral regions can be used for dynamic monitoring of crops. NDVI values increase with the growth of the crops, and gradually decrease after reaching the maximum at a certain growth stage of the crops. Because different crops have different growth stages, the NDVI peak values and their occurrences can be different. After investigating the planting structure of the main crops and analyzing the NDVI values of different crops from mid-March to mid-November of 2002 in Beijing, the temporal changes of NDVI profiles were obtained. In corporation with 1:100,000 scale landuse data of Beijing, the planting areas of winter wheat, spring maize, summer maize and bean were extracted from MODIS data, and the total accuracy is over 95%.