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卫星照片是一种多波段影像。同普通照片一样,也是以底片上的密度差异记录被拍照物的光反射特性,显示被拍物体几何形状的。与普通照片不同的是,它对同一物体以多个(本研究用卫片是4个) 波段的方式进行记录,得到多张底片,每张底片只记录一个特定波段的地物反射特性,因而同一物体在各张底片上密度分布是不同的。正是由于这一点,卫星影像给我们提供了区分各种地物的可能性。本研究是通过卫片的影像密度值来估测森
Satellite picture is a multi-band image. As with normal photographs, the light reflectance characteristics of the subject matter are also recorded by the difference in density on the negative film, indicating the geometric shape of the subject being photographed. Different from the ordinary photograph, it records the same object in the way of multiple bands (in this study, the satellite is 4), to obtain multiple negatives, each film only records the reflection characteristics of a specific band, and thus The same object in each film on the density distribution is different. It is for this reason that satellite imagery offers us the possibility to distinguish between various features. In this study, we estimate Sen by the image density of the patch