人民长江2009，Vol.40Issue(14)：40-43,4.
基于MODIS数据的洞庭湖水面面积估算方法
MODIS-based water surface area estimation method of the Dongting Lake
摘要
Abstract
Two methods for different timescales based on the NDVI data provided by MODIS/Terra are used for estimating the water surface area of the Lake Dongting from 2000 to 2007. At the annual timescale, the unsupervised classification method of ISODATA is applied to the NDVI time series. Based on the result of classification water surface and various wetland types can be distinguished, and then the changes of the wetlands′ area are analyzed. At the monthly timescale, the 16-day average of NDVI data is used for identifying water surface, and different NDVI threshold is selected for different seasons. The difference of water surface area obtained from monthly timescale NDVI data is compared with the water surface area derived from the water level-area curve. Finally, we discussed the advantage and disadvantage of the two classification methods at annual and monthly timescales.关键词
水面变化/MODIS/NDVI/非监督分类/洞庭湖Key words
water surface change/ MODIS/ NDVI/ unsupervised classification/ Dongting Lake分类
资源环境引用本文复制引用
龚伟,杨大文,钱群..基于MODIS数据的洞庭湖水面面积估算方法[J].人民长江,2009,40(14):40-43,4.基金项目
水利部公益性行业科研专项经费项目(200801008) （200801008）
国家"十一五"科技支撑计划(2006BAB05B04-3(1)) （2006BAB05B04-3(1）
