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Construction of the 3DBGT
for the whole NL
Hugo Ledoux & Tom Commandeur
2016-05-31
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Construction of the 3DBGT
for the whole NL
Hugo Ledoux & Tom Commandeur
2016-05-31
in LOD1
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construction 3DTOP10NL = intricate workflow
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ITC/Sander’s code
FME
+
ArcGIS
output
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3DTOP10NL: currently many errors
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• 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
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3dfier
An open-source toolkit to
construct large 3D city models
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More or less the same as current 3DTOP10NL, but:
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• 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)
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Input: any 2D datasets (eg TOP10NL or BGT)
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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
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Assign each LiDAR point to polygons
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Assign each LiDAR point to polygons
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bu↵er 1m bu↵er 1m bu↵er 1m
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Lifting each polygon based on simple rules (eg avg)
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some classes have LiDAR points (Terrain, Vegetation)
others not, ie only their vertices are lifted
percentile 40
percentile 10
gaps
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Stitching adjacent polygons with pairwise rules
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Stitching adjacent polygons with pairwise rules
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avg of both
vertical surfaces added
volume of buildings can be preserved
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gaps
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Output: DSM triangulated (→simulation software)
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Output: CityGML with volumes for buildings
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Far from finished, but usable
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https://github.com/tudelft3d/3dfier
Windows executable available
new!
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status?
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• works for small areas, roads a bit “shaky”
• only TOP10NL
• starting to work on BGT
• buildings not finished