Rapid generation of 3D GIS content from reality capture data sources. Keir Keightley, HDR
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1 Rapid generation of 3D GIS content from reality capture data sources Keir Keightley, HDR
2 Purpose Why do we want 3D GIS content? A picture is worth a thousand words, and more, if you can navigate it in 3D Visualization: a)key to demonstrating capability when pursuing work b)powerful for communicating ideas, information and progress among project team members c)effective in revealing completed results to clients
3 Purpose Why do we want 3D GIS content? A picture is worth a thousand words, and more, if you can navigate it in 3D Reality capture: Current state of an object of interest and its environment ( as is conditions) Rapid, detailed, cost effective Broadly accessible Better than as-built drawings, traditional survey, manual measurements and photographs Users can consume 3D content via widely available GIS platforms
4 Methods Hardware, Software and Workflow
5 Capturing Reality Laser scanner or other point cloud generating device
6 Software Scan alignment: Scene, ReCap, CloudCompare (fls, e57, others) Segmentation and clean-up: CloudCompare (e57, ply) Surface meshing: Meshlab (ply, dae) Modeling: SketchUp (dae, skp)
7 Reality Capture Modeling Workflow 1. Scan site (experience goes a long way) 2. Align scans: generally completed as part of the scan process by scanning technician 3. Create unified point cloud
8 Reality Capture Modeling Workflow 4. Segment data into logical groups (e.g. interior walls by room/floor, ceilings/floors, roof, exterior walls, surrounding site) using CloudCompare (v2.8.1)
9 Hardware, Software and Workflow Reality Capture Modeling Workflow 5. Clean and decimate data: a. Remove noise and extraneous data b. Reduce data density and generate uniform sample (minimum distance sample)
10 Reality Capture Modeling Workflow 6. Transform data for easier use in modeling (z axis is different in modeling program), export to *.ply Initial rotation and translation: Secondary rotation (to fix axis transposition in Sketchup):
11 Reality Capture Modeling Workflow 7. Mesh point cloud to create surfaces (ball pivoting, Meshlab v1.3 beta), export to collada file format (*.dae)
12 Reality Capture Modeling Workflow 8. Import mesh files to modeling software, create cross sections as needed (vertical, horizontal or oblique) in Sketchup (v2017)
13 Reality Capture Modeling Workflow 9. Generate finished 3D model surfaces based on reality capture based surfaces
14
15 Reality Capture Modeling Workflow 10.Place model in real world location adjusting horizontal position, rotation angle and elevation
16 Site/Environment Modeling Workflow 1. Assemble geospatial data for inclusion in site modeling 2. Create empty CityEngine project 3. Import vector data, aerial and elevation data
17 Site/Environment Modeling Workflow 4. Assign procedural modeling rules to feature groups, such as... a. Extrude buildings b. Assign tree species and height c. Customize roadway rules to best approximate reality
18 Site/Environment Modeling Workflow 5. Import detailed model from reality capture workflow 6. Port to viewing platforms (online/agol, offline CEViewer, Google Earth, others)
19 Site/Environment Modeling Workflow 5. Import detailed model from reality capture workflow 6. Port to viewing platforms (online/agol, offline CEViewer, Google Earth, others)
20 Site/Environment Modeling Workflow 5. Import detailed model from reality capture workflow 6. Port to viewing platforms (online/agol, offline CEViewer, Google Earth, others)
21 Site/Environment Modeling Workflow 5. Import detailed model from reality capture workflow 6. Port to viewing platforms (online/agol, offline CEViewer, Google Earth, others)
22 Results Product, Issues, Recommendations
23 Reality Captured Detail like angled ramp is not lost to generic modeling
24 Reality Captured Error tracking possible by comparing mesh with modeled surfaces. Deviation between measured and modeled data revealed in surface difference maps.
25 Results are portable and accessible Visualization is at the team s fingertips ArcGIS Online Link
26 Questions Acknowledgments CloudCompare: danielgm.net GNU GPL MeshLab: meshlab.net, isti.cnr.it (open source)
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