motivation approach results - fig · pdf file• motivation • approach –...
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![Page 1: Motivation Approach Results - FIG · PDF file• Motivation • Approach – Overview ... Site Plan CAD (3D‐) GIS Real Object. 31.5.2012 3 – Generation of horizontal histogram](https://reader031.vdocuments.us/reader031/viewer/2022020302/5a7eb76c7f8b9ae9398eb63f/html5/thumbnails/1.jpg)
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Carmen Müller
Tobias K. Kohoutek
Pascal W. Theiler
Institute of Geodesy and Photogrammetry
ETH Zurich
Wolfgang‐Pauli‐Str.15
8093 Zurich, Switzerland
• Motivation
• Approach
– Overview
– Description
• Results
• Outlook
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– Increased use of laser scanning in archaeology for• Documentation• Analysis• …
– Challenge of data handling• Data size versus relevant information• Automation is needed
How to get a georeferenced site plan in no time?
Horizontal Histogram
Extraction of Site
Plan Elements
Point Cloud
Shapefile
Site Plan CAD
(3D‐) GIS
Real Object
![Page 3: Motivation Approach Results - FIG · PDF file• Motivation • Approach – Overview ... Site Plan CAD (3D‐) GIS Real Object. 31.5.2012 3 – Generation of horizontal histogram](https://reader031.vdocuments.us/reader031/viewer/2022020302/5a7eb76c7f8b9ae9398eb63f/html5/thumbnails/3.jpg)
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– Generation of horizontal histogram
– Thresholding binary image
– Extraction of site plan elements• Multiple thresholds• Segmentation
– Morphological operations• Erosion• Dilation
– Boundary tracing for vectorization
– Storage in shapefile
xx
x
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St. Maria, Laramate, Perú
Automated extractionManual interpretation
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Domus Aurea, Rome, Italy
– Chosen approach works well for vertical walls
– Other vertical objects connected to the walls cannot be removedautomatically (e.g. plants)
– Only areas containing parts of a wall remain in the site plan
– Estimated accuracy• historical, well defined walls → 1 ‐ 10 cm• other, less well defined walls → 10 ‐ 20 cm
Site plans can be automatically generated based on laser scanner data
![Page 5: Motivation Approach Results - FIG · PDF file• Motivation • Approach – Overview ... Site Plan CAD (3D‐) GIS Real Object. 31.5.2012 3 – Generation of horizontal histogram](https://reader031.vdocuments.us/reader031/viewer/2022020302/5a7eb76c7f8b9ae9398eb63f/html5/thumbnails/5.jpg)
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– Improvement of extraction algorithm
– 2D GIS analysis
– 3D Reconstruction