变差函数在遥感图像处理中的应用

The Use of the Variogram in Remotely Sensed Images

遥感的空间信息反映一定范围内像元在空间上的关系，空间结构变化代表一个局部区域中各像元之间光谱辐射能量的关联状态或图像灰度变化，利用空间信息来开拓图像分析技术将获得遥感目标很高的正确识别率。变差函数是联系遥感目标和图像中空间变化特征的有用工具，实验变差函数的计算结果揭示了遥感目标种类与变差图之间的定量化空间关系。

It is the increased use of spatial data in remotely sensed images that we can get the valuable extraction.The approach to link the nature and causes of spatial variation in images is to use the variograms.The data results from the airborne imaging spectrometer over the sea prove that the variograms are the tool used to link models of sea surface scenes such as cloud,the cloud shadows and the normal sea surface.Some directions vario grams indicate the irridance anisotropy,the height of the sills of the variograms are related to the kinds of the remotely sensed objects and the range of the influence is related to the acting distance in pixels of the sea objects.Therefore,the variograms can be used in unsupervised pattern in area by the airborne or spaceborne sensed images.