Researching on extracting irrigated land in northern China based on MODIS data

Irrigated land is the main region which produces a large amount of foodstuff. It has great meaning in the aspect of agriculture, foodstuff security and regional water resource development. Until now it has seldom researched on irrigated land by using remote sensing. This paper retrieves soil water by using crop water stress index (CWSI) during crop growth. It extracts irrigated land after removing rainfall influence. Results show that the extracted results are near the statistic data in quantity. The average deviation is 5.75%. The extracted results mainly distribute among the river, lake, reservoir, oasis and irrigated region. It verifies the results elementarily through interpreted sign. Xinjiang province is the highest while Heilongjiang province is the lowest.