以水体为观测目标的Worldview-2融合方法评价

Evaluation of fusion methods for Worldview-2 aiming to water body observation

为了提高影像的分辨率、强化影像隐含的信息,在影像的预处理过程中往往需要将不同分辨率数据进行融合,实现优势互补.以Worldview-2的3景遥感影像为数据源,钱塘江重点河段为研究对象,对以水体悬浮泥沙为主要观测目标的遥感影像开展融合方法的评价,以及大面积水域对影像融合方法选择的影响机制的探讨.结果表明,大面积水体的存在会影响到融合影像保留源图像光谱信息的能力,影响了最佳融合方法的选择,Gram-Schmidt是最合适本次研究3幅影像的融合方法.经Gram-Schmidt融合后的影像能获取到更加详细的悬浮泥沙运移信息.

The remote sensing data with different spatial resolutions were fused to construct images. In this study, three Worldview--2 images were used to investigate the concentration of suspended sediment in segments of Qiantang River. The fused effects were assessed and impacts from large area of water were an- alyzed. The results indicate that the large area of water affects the ability of fused image including the spectral information of original image. The size of water area in the remote sensing image is an important factor for selecting optimal fusing method. Gram-Schmidt is the ideal fusing method in this study. The detailed information of suspended sediment transport is constructed using the fused image.