基于MODIS数据的水体提取研究

Method for Water Bodies Extraction Based on MODIS Images

通过对遥感图像各类地物的光谱和水体在中等分辨率的EOS/MODIS上的波谱特征的分析,论述了水体最为明显的波段组合,研究了如何从不同时期(枯水期、丰水期)的中等分辨率MODIS遥感影像提取水体的方法,并以武汉市梁子湖为例,对水体提取范围和精度进行比较和分析。实验表明:遥感图像经空间变换后再利用相同的方法提取的水体,更容易区分水体和阴影,产生的噪声也少,提取的水体范围更准确、计算的水域面积精度更高。

By analyzing the spectral characteristics of different futures and spectral characteristics for water on the EOS/MODIS images, the distinguished water compound bands were discussed. Methods are studied to withdraw water area from different time （low water period ＆ high water period） of middle resolution remote sensing images. The extracted water area boundary was discussed, and the precision was analyzed by taking the case of Liangzi Lake. The last explanation showed that it was advantaged to extract the water area after the process of space transformation for more exact and high precision statistic of water area with lower noises and when we utilized the same method.