The Laser scanning tutorial at Wuhan University
visited:
by Prof. George Vosselman, ITC, the Netherlands
| Monday October 8 |
|
| 9:00 - 11:00 |
Introduction to laser scanning and overview on some sensor developments. Visualisation techniques (interpolation, shading, colouring) |
| 14:00 - 16:00 |
Segmentation of point clouds (surface growing, scan line grouping, TIN mesh merging, voxel space analysis, 3D Hough transform for detection of planes, RANSAC). Demonstration of surface growing algorithm. |
| Tuesday October 9 |
|
| 9:00 - 12:00 |
Error sources (instrument errors, integration errors, processing errors) Error analysis (visual analysis, measurement of height offsets, measurement of planimetric offsets, usage of reflectance data, using geometric models). Demonstration on measurement of gable roofs. Strip adjustment (1D and 3D approaches, modelling of error sources vs. modelling of effects on DTM, non-constant errors, estimability of parameters). Experiences with the national Dutch elevation model. |
| 14:00 - 16:00 |
Filtering of laser data (mathematical morphology, least squares interpolation (SCOP++), TIN densification (TerraScan), segment based filtering). Breakline detection (analysing 2nd derivatives, estimating intersecting planes) |
| Wednesday October 10 |
|
| 9:00 - 12:00 |
Building detection (classification of segments, usage of multi echoes, outlining footprints). Building modelling (bottom-up, top-down approaches, usage of map information). Demonstration on building modelling from point clouds. Modelling of 3D road networks. Vegetation detection and analysis. |
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