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：2000
卷号：XXXIII Part B4 (/1-3)
页码：45-52
出版社：Copernicus Publications
摘要：The spatial quality of an image consists of the geometric accuracy and the spatial resolution. The Finnish Geodetic Institute (FGI) has a permanent test field to control the spatial quality of airborne images. The permanent test bar targets of the test field are constructed from different types of gravel with contrast ratios 1:2 and 1:10. The transportable test bar targets (contrast ratios 1:2 and 1:10) are useful in two scales: 1:3000 and 1:60000. The ground control points are signalised with round shaped white signals and they are located in an area of about 1 km 2 . The geometric accuracy of an imaging system can be analysed by imaging a 1:3000 scale block over the permanent test field. Block adjustment with and without additional parameters can be carried out for determining internal and external accuracies. Film exposure can be checked using a known grey scale on the ground. The spatial resolution of the aerial images can be determined visually or numerically. We are developing a quality control system that takes into account different parts of the photogrammetric process. The spatial quality of the imaging and photogrammetric system must be controlled in the beginning of the season. More research and data are needed to get useful tolerances for the quality criteria and these have to be tested for several photogrammetric tasks at different scales before an operative system can be installed
