文章基本信息

标题：Rational Polynomial Modelling for CARTOSAT-1 data
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作者：Sanjay K Singh ; S Devakanth Naidu ; T P Srinivasan 等
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：2008
卷号：XXXVII Part B1
页码：885-888
出版社：Copernicus Publications
摘要：Cartosat-1, ISRO's first satellite with along track stereo capability was launched in May 2005 providing high-resolution stereo imagery of earth's surface for cartographic applications. Providing relevant ancillary information along with the data product is the general practice followed by satellite data providers. Rational Polynomial Camera (RPC) model is used to represent the imaging geometry of Cartosat-1 which is expressed as a ratio of two cubic polynomials which are functions of ground coordinates. One of the important products realised for Cartosat-1 is Stereo Orthokit. Cartosat-1 Orthokit products are already in demand among global users who are able to perform the required geometric processing including DEM generation, ortho-rectfication at their end with the help of any standard COTS Package.Orthokit product consists of radiometrically corrected image in GeoTIFF format, corresponding RPCs and a metadata file, which gives the information about the data. In Stereo Orthokit product, image data from both cameras i.e. FORE and AFT is provided along with their corresponding RPCs. Another product under consideration for Cartosat-1 is Geo Orthokit, where geometrically corrected image is planned to be supplied along with associated RPCs. One of the advantages of this product is user can directly use the product for their applications since the image supplied is already geometrically corrected with mean height. The other advantage is that it will ease the DEM generation process by properly utilizing the reconstruction of epipolar geometry. This paper provides the technical details of RPC generation process and geometric accuracy assessment of the Orthokit products in comparison with georeferenced image generated using Cartosat-1 rigorous imaging sensor model. Both quantitative and qualitative verifications have been conducted over a number of stereo pairs. This paper also addresses the problems observed in RPC during initial phase of the mission and the remedial actions taken to resolve them. From the exercises and analysis carried out, it is clear that Cartosat-1 Orthokit products are meeting the accuracy requirements of global users for various photogrammetric applications. This paper also deals with the approach considered and results achieved for realisation of Geo Orthokit product
关键词：Cartosat-1; RPC; Stereo image; Stereo Orthokit; Geo Orthokit