标题：System calibration, geometric accuracy testing and validation of DEM & orthoimage data extracted from SPOT stereo pairs using commercially available image processing systems
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：1998
卷号：XXXII Part 4
出版社：Copernicus Publications
摘要：The paper describes the comprehensive testing of the digital photogrammetric modules forming parts of the image processingsystems available from a number of remote sensing system suppliers - PCI, ERDAS, R-WEL, etc. - for use with SPOT stereo-pairs. Thetests have been conducted over a large area of 12,000 sq.km forming part of the Badia, a desert area located in the north-east ofJordan that is covered by a block of five SPOT stereo-pairs. The terrain data available for calibration and testing has included a veryhigh accuracy test field comprising 130 ground control points, whose positions and heights have been established using differentialGPS. This is supplemented by 150km of profile data measured using real-time kinematic GPS and by digitized contour data derivedfrom existing 1:50,000 and 1:250,000 scale topographic maps of the area produced using aerial photogrammetric techniques.The results of a comprehensive series of geometric accuracy tests are given for both Level 1A and 1B image data. This isfollowed by the results of a series of tests to validate the DEMs and the contours derived from the elevation data produced by each ofthe packages that have been tested. The final results from this validation are surprisingly good, but only after extensive use of filteringtechniques to remove the artefacts and spurious features generated by the image matching routines employed by the different systems.The results achieved during tests of the individual orthoimages and the orthoimage mosaics produced using the SPOT DEM data setsare also given, both in terms of their radiometric quality and their geometric accuracy.This comprehensive series of tests revealed a number of flaws and shortcomings in all of the image processing systems thathave been calibrated and tested. Some of the more serious flaws are described and discussed in the paper. The findings from the testsresulted in the flawed parts of the various systems being modified and then re-tested via a highly interactive interchange of programsand data between the authors and the system suppliers - to the benefit of future users of these systems. The test area, having provenits worth, is available for testing of other space image data - including that from the forthcoming commercial high-resolution satellites - ina similar manner to that described in the paper
