FIG Commissio n 7 · 7.Models 8.Using point clouds directly in design and construction QA...
Transcript of FIG Commissio n 7 · 7.Models 8.Using point clouds directly in design and construction QA...
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For Everyday Topographic and For Everyday Topographic and PlanimetricPlanimetric SurveyingSurveyingFIG Commissio
n 7Cadastre & Land
ManagementMadison, Wi.
24-25, June 2005
Extracting Features from 3D Point Clouds in the Preparations of
Topographic Survey Maps
By:
Bradley C. BurgessMidwest Regional Sales Manager
Leica Geosystems HDS, Inc.
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Presentation Outline:
• High Definition Surveying Explained
• Executing Projects that Include Scanning
• Basic Methods/ Options for Extracting Geometry
• Final Delivery ExampleI-94/ Hwy. JJ, Waukesha, Wi.
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Primary differentiating feature: high density“as-built” or “as-is”
geometric data
Utilizing 3D laser technology, HDS captures, visualizes and models complex structures and sites with an unprecedented combination of completeness, speed, accuracy, and safety.
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Laser sweeps over surface
HDS Fundamentals:
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Points are recorded . . .
HDS Fundamentals:
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. . . Over the entire surface
HDS Fundamentals:
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The data is so dense, you get the added value of an image
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Executing Projects that Include Scanning
– Overall project flow– Field workflow– Office workflow
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Overall Project Workflow Planning, Site Visit?
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Overall Project Workflow Planning, Site Visit?
Site ControlField scanning Traditional surveying
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Overall Project Workflow Planning, Site Visit?
Site ControlField scanning
Registration
Office processing => Deliverables, maps
Traditional surveying
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Overall Project Workflow Planning, Site Visit?
Site ControlField scanning
Registration
Office processing => Deliverables, maps
Traditional surveying
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Office Workflow
Geo-referencing/registration Import othersurvey data
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Office Workflow
Geo-referencing/registration
Data clean-up or filtering
Import othersurvey data
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Office Workflow
Geo-referencing/registration
Data clean-up or filtering
Data segmentation
Data decimation
Extract & process data into deliverables
Import othersurvey data
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Office Workflow
Geo-referencing/registration
Data clean-up or filtering
Data segmentation
Data decimation
Process data into deliverables
Import othersurvey data
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1. Points2. Distances3. Lines4. Surfaces 5. Volumes6. Features7. Models8. Using point clouds
directly in design and construction QA
Standalone “point cloud”
software
“Point cloud”CAD integration
softwareCADD software
CADD softwareExport Import
and/or
Option A Option B
Basic Methods/ Options for Extracting Geometry & Creating Deliverables from Scan Data
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Extracting Points & Distances
Each scan point has an X,Y,Z coordinate
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Extracting Points & Distances
Point-to-point slope distance
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Extracting Points & Distances
Point-to-surface normal distance
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Extracting Line Work: Automatic Sections
Any interval along the alignment can be selected
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Extracting Line Work: Tracing Over Points
Work in 2D or 3D
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Extracting Line Work: from ASCII Coded Points
This technique is also known as “Virtual Surveying”
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Extracting Line Work: Best-fitting of Curb Lines
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Extracting Surfaces & Volumes
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Extracting Features & SymbolsDescription keys allow
points to be imported to designated layers with symbols attached according to point descriptions.
Data is imported to AutoCAD as Fieldbook file (.fbk)
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Creating Models
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Final Deliverable Example
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HDS: The Potential is in the Cloud!
Mining the Cloud…and
“Delivering the Deliverables” Capturing Reality Cloud of Points