科研之友
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摘要
Until recently, the acquisition of high quality digital elevation models was dominated by the use of airborne lidar. However, meanwhile the increasing quality of digital airborne cameras in combination with recent improvements in matching algorithms allow for an automatic image-based acquisition as a suitable alternative. Within the paper, this progress will be demonstrated on the example of photogrammetric DEM generation using the semi-global matching (SGM) stereo method. Since this approach aims at pixel-wise matching, dense 3D point clouds can be generated. The tests described in the paper are based on data collected from different digital airborne cameras at various flight scenarios during a recent test on photogrammetric 3D data capture. Thus, the impact of different stereo configurations on the quality of the final outcome can be evaluated and compared to test results already available. Special interest is also paid to the combination of multiple stereo pairs with different base-to-height ratios, which can be used efficiently to increase the precision and reliability of the matching results.
- 出版日期2012
