Construction of the 3DBGT for the whole NL

Transcript

1. Construction of the 3DBGT for the whole NL Hugo Ledoux & Tom Commandeur 2016-05-31
2. Construction of the 3DBGT for the whole NL Hugo Ledoux & Tom Commandeur 2016-05-31 in LOD1
3. construction 3DTOP10NL = intricate workflow 3 ITC/Sander’s code FME + ArcGIS output
4. 3DTOP10NL: currently many errors 4 • all triangles are duplicated • some classes are not triangulated • long and skinny triangles • vertical triangles have wrong orientation • disconnected regions • all buildings have wrong orientation normals • big parts of tiles are missing • full list at: • https://github.com/3D4EM/validate-3dtop10nl/blob/master/reports/comments.md
6. 3dfier An open-source toolkit to construct large 3D city models
7. More or less the same as current 3DTOP10NL, but: 7 • focus on scalability and speed ‣ our aim construction whole NL on “normal” PC • configurable: any 2D input + user-defined options • no segmentation: only simple rules • no vertices added when 3dfying (except within Terrain and Vegetation polygons; never on boundaries) • based on open-source libraries used: ‣ liblas, GDAL, Boost.Geometry, CGAL • output in different formats (SHP, CityGML, OBJ)
8. Input: any 2D datasets (eg TOP10NL or BGT) 8 Terrain Vegetation Water Vegetation Building Road Building Road We assign each polygon to one of 5 classes: 1. Building 2. Water 3. Road 4. Vegetation 5. Terrain
9. Assign each LiDAR point to polygons 9
10. Assign each LiDAR point to polygons 10 bu↵er 1m bu↵er 1m bu↵er 1m
11. Lifting each polygon based on simple rules (eg avg) 11 some classes have LiDAR points (Terrain, Vegetation) others not, ie only their vertices are lifted percentile 40 percentile 10 gaps
12. Stitching adjacent polygons with pairwise rules 12
13. Stitching adjacent polygons with pairwise rules 13 avg of both vertical surfaces added volume of buildings can be preserved
14. gaps
16. Output: DSM triangulated (→simulation software) 16
17. Output: CityGML with volumes for buildings 17
18. Far from finished, but usable 18 https://github.com/tudelft3d/3dfier Windows executable available new!
19. status? 19 • works for small areas, roads a bit “shaky” • only TOP10NL • starting to work on BGT • buildings not finished
20. thank you. h.ledoux@tudelft.nl 3d.bk.tudelft.nl/hledoux Hugo Ledoux