| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 96 === When using 3D Laser scanner, multiple scans are required for a complete scan project. The point clouds of each scan is defined a local coordinate, data sets of multi-station must be merged into a uniform coordinate system or each coordinate system transforming parameter. One way is put at least three targets in overlapping scan stations to get coordinate system transforming parameter, so target’s positioning precision and accuracy is important.
The study use Trimble Mensi GS200 3D laser scanner to experiment. In order to improve target’s positioning precision and accuracy, we consider two factors: 1. Point clouds make noises with environment, and therefore use six noise filterings: remove scatter points、remove spikes、fit plane、gaussian smooth、median smooth、averaging smooth to filter point cloud’s noises. 2. Different targets have different precision and accuracy. Besides original targets, we use handmade targets and compare the relationship with both targets.
Experiment divide into three distances 30m、60m、90m, the result found using six noise filterings improve target’s positioning precision and accuracy certainly. Behind comparing the relationship with original targets and handmade targets, handmade targets are better than original targets in precision part. In 30m and 60m distances original targets are better than handmade targets in accuracy part, but in 90m distance handmade targets are better than original targets in accuracy part.
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