多源遥感影像的最优尺度选择

遥感信息普遍存在着尺度效应,合适的空间分辨率可以反映特定目标的空间结构特性。基于地理学第一规律,选择了目前主要采用的2种方法——局部变异和变异函数对最优尺度的选择进行研究,并针对传统方法的局限性提出了改进方案。通过同一地区的遥感卫星Landsat 7,Spot-5/HRG和QuickBird遥感影像,对不同的景观区域采用不同的方法进行了比较研究。根据实验,得出了局部变异适合微观、变异函数则更适用于宏观问题的结论,并得到了不同数据源在不同景观类型下的最优尺度。最后,根据最优尺度选择的结果,讨论了不同数据源的适用性。图4表4参19

Choice of optimal scale for multi-source remote sensing images

Spatial scaling effects are a universal issue for the remote sensing.The appropriate spatial resolution can reveal the spatial structure of specific objects.Based on the First Law of the Geography,frequently used local variance and variograms methods are adopted in this research.Because of the limitation of conventional methods,the modified scheme is available for reference.With Landsat 7,Spot-5/HRG and QuickBird images in the same region,the two different methods are compared for different landscape patter...