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 1
页码：53-66
出版社：Copernicus Publications
摘要：Geometric and radiometric investigations performed with two LH Systems DSW300 scanners are presented. Good quality test patternsand accurate processing methods for their performance evaluation have been employed. The geometric tests include global and Joe~geometric errors, misregistration between colour channels, geometric repeatability and determination of the geometric resolution.Efforts were made to separate the contribution of various error sources (especially mechanical positioning, vibrations and lensdistortion) on the total error. The radiometric tests include investigations of noise, linearity, dynamic range, spectral variation of noise,and artifacts. After a brief description of the scanner, details on the above investigations, analysis and results will be presented.Regarding the geometric accuracy the RMS was 1.3 -1 .9 J..Lm and the mean maximum absolute error4.5- 8 J..Lm. The errors are bounded,i.e. on the average the 3 sigma (99.7%) values are 3 RMS, and the maximum absolute error 3.7 RMS. The co-registration accuracy ofcolour channels was about l J..Lm. The short and medium term repeatability was very high. With a linear LUT the radiometric noise leveiis 1 and 1-1.5 grey values for 25 and 12.5 flm scan pixel size respectively. The dynamic range is 2D with a very good iinear responseup to this value. One of the major remaining radiometric problems is dust. In both geometric and radiometric tests no significantdifferences between R, G, B and B/W scans has been observed. These results show that the geometric and radiometric quality ofDSW300 has been very much improved as compared to DSW200 and also other scanner models. This test was part of a long and fruitfulcooperation between the manufacturer, a major user, and an academic institution and show that honest and critical behaviour, as well asthorough understanding of the problems and search for solutions, can lead to serious improvements to the benefit of all.
