Monitoring of Water Area Changes Based on the Normalized Difference Water Index
Based on Terra/MODIS satellite data from January to December 2022,the water area of East Dongting Lake was calculated,and the accuracy of EWI,NDWI,and MNDWI,three water indices,were compared.The results showed that:(1)Terra/MODIS satellite data had good effects in extracting water area on the mesoscale.(2)Among the three water indices of EWI,NDWI,and MNDWI,NDWI performed the best in water extraction,with the highest accuracy and Kappa coefficient.(3)In 2022,the water area of East Dongting Lake exhibited a characteristic of being small at both ends and large in the middle,which meant that it was larger from May to July and smaller in other months.Specifically,the water area was the smallest at the beginning of March,reaching 15 392 hm2,while it was the largest at the beginning of June,reaching 99 745 hm2.
remote sensingTerra/MODIS dataNDWIdynamic monitoringDongting lake
NETL
NSTL
万方数据
