Monitoring planting area and growth situation of irrigation-land and dry-land winter wheat based on TM and MODIS data

In this study, Mahalanobis Distance classification was selected to extract the planting area of winter wheat. The planting area of winter wheat under different irrigation patterns was extracted through building decision tree structure. By contrasting of MODIS-NDVI at the different stages for two years, the NDVI temporal profiles and the response law of growth situation of winter wheat were analyzed. The results show that the total planting area of winter wheat was 234778.5 hm2 with a precision of 96.96%, the planting area of irrigation-land winter wheat was 142111.6 hm2 with a precision of 86.15%, and dry-land was 92666.8 hm2 with a precision of 86.16%. During the growth stage, the whole growth situation of irrigation-land winter wheat was better than dry-land wheat. By contrasting of the slope of the NDVI variation, it showed that along with the process of growth stage, the NDVI ascending velocity of irrigation-land winter wheat was higher than dry-land before the peak value, and the NDVI declining velocity was lower than dry-land after the peak value.