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：2006
卷号：XXXVI Part 4
出版社：Copernicus Publications
摘要：The scope of the work is to perform the stereo restitution of Cartosat-I data by refining the raw Rational Polynomial Coefficients (RPCs) for determining the (a) optimal requirement of control points, (b) geometric accuracy in plan and height, (c) accuracy of the Digital Elevation Model (DEM), and (d) adequacy of the resulting orthoimage for the purpose of topographic mapping. The data set obtained for the study (TS6: Rome, Italy) contains one stereo pair, 50 Control points and a reference Digital Terrain Model (DTM). With this product, the RPCs of third degree are provided in lieu of sensor and satellite parameters. These vendor-side RPCs are sensor-derived and terrain-independent. They require refinement at scene/block level for attaining mapping accuracy. The user-side RPC refinement model is adapted in this exercise. The reference frame adapted is WGS-84, UTM, and orthometric heights. The results demonstrate the RPCs could be refined to mapping accuracy standards using one GCP upwards. The DEM obtained through automatic matching needs to be reduced to bald-earth prior to comparing it with the reference elevations. Extraction of open areas for the purpose of DEM comparison is accomplished through filtering based on slope criterion. For orthorectification, the near-nadir image of AFT camera is used
