期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2002
卷号：XXXIV Part 4
出版社：Copernicus Publications
摘要：Satellite imagery of dynamic environments can only yield precise ground object positional information if temporally accurate ground truthing occurs. Thus, detailed knowledge of satellite overpass characteristics permits ground truthing activities to coincide with imagery acquisition, and also ensures that the deployment of such resources is done in an efficient and cost effective manner. Although the determination of these characteristics is of relative ease for the agencies which control the remote sensing platforms, the current reality of licensing is such that imagery providers are unwilling or unable to guarantee the date/time of data acquisition.
