从TM遥感图像中提取最佳立地信息方法研究

在分析TM原始波段图像信息特征的基础上,提出了原始图像合成方案,即在可见光组(TM1、2、3),近红外波段(TM4)和中红外光组(TM5、7)中各取一波段合成图像,可获满意的效果。提取最佳立地信息的方法是:单波段直方图均衡化或线性扩展、多波段主成分变换。处理后的合成方案为:直方图均衡化的TM5、2和突出植被信息的第二主成分图像组成最佳方案。处理前后的合成方案相比,后者图像色彩鲜艳,色调明快,地物类型边界清晰,立地信息判读效果甚佳。

Methodology of Extracting Optimum Site Information from Landsat-TM Remote Sensing Images

In this paper, on the basis of the research and analysis of lan-dsat-TM band information signathres by mdans of aries-Ⅱ image analysis system, an ideal scheme of pseudo-colour composite is raised, that is with one band takenfrom each of three spectral regions on TM (visible, TM 1, 2,3; near-infrared, TM 4; and middle-infrared, TM 5,7) a comopsite, Inter-oretation effects can be satifactorily obtained through the scheme. The apporach of extracting optimal site information is as follows : histogram equ-alizating and/or linear contrast stretching to singal TM-band; principal co-mponent analysis (PCA) applied to multi-band simultanously. The optimal composite scheme is: TM 3 and 2 processed with histogram equalization, and the second component image, which shows abundant vegetation information. The scheme for extracting site information was compared with the optimal original composite scheme, she latter's image is more gaily-coloured, its tones are brig-hter, geographic landscape boundaries are clearer, and insrpretation effects for site information are better than the former's