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信息提取是陆地卫星影象应用的关键。多光谱陆地卫星影象上包含的信息大致可以归纳为以下三种:(1)空间几何信息;(2)光谱信息;(3)动态信息。陆地卫星多光谱扫描影象空间几何信息的丰度取决于图象的空间分辨率。超过分辨率限度并紧挨在一起的各物体在图象上就表现为一个单一的目标。从根本上说,图象的空间分辨率取决于79m×79m大小的地面分辨单元(ground resolution cell)。至于陆地卫星影象的光谱分辨率,则包括三种含义:(1)特定光谱段的某幅卫星影象上通过灰阶反映出来的地物反射光谱的差异,从而区分影象上各种物体的能力;(2)某
Information extraction is the key to terrestrial satellite imagery applications. The information contained in multi-spectral terrestrial satellite images can be broadly summarized in the following three categories: (1) spatial geometry information; (2) spectral information; (3) dynamic information. The abundance of geometry information for multispectral scanning of terrestrial satellites depends on the spatial resolution of the image. Objects that exceed the resolution limit and stand next to each other behave as a single object in the image. Fundamentally, the spatial resolution of an image depends on a ground resolution cell of 79m × 79m. The spectral resolution of terrestrial satellite images includes three meanings: (1) the difference of the reflection spectra of the objects reflected by the grayscale in a satellite image of a specific spectrum segment, so as to distinguish the various objects on the image The ability of (2) a