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INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION Adding the Third Dimension to a Topographic Database Using Airborne Laser Scanner Data Sander Oude Elberink Delft, 1 st September 2006
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Contents Introduction Data properties Laser data Map data Approach Densifying 2d map Segmentation 3D reconstruction process (incl. processing rules) Surface modelling Results Conclusions & future work
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Introduction Growing demand 3D data Automated acquisition Data fusion: laser data + 2d map Now: focus on infrastructure Research project 3D Modelling 3D Acquisition TU Delft: Oosterom, Verbree, Penninga ITC Enschede: Vosselman, Oude Elberink
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Data properties Laser scanner data “AHN” Point cloud 1 point / 9 m^2 Topographic database “TOP10NL” Object based 1:10.000 Roads, buildings, land use,… Outlines Classification Semantics
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Approach - overview Preprocessing data Adding height to map points Reconstruct new 3D polygons Adding heights to surfaces Segment laser data Densify map data Detect multiple heights Interpolate laser data Multiple levels Add semantics Add laser data or knowledge
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Preprocessing Laserdata Surface growing Seed surface detection by 3D Hough Smooth surfaces allowed Small segments removed Topographic map More map points needed in 3D
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Preprocessing Laserdata Surface growing Seed surface detection by 3D Hough Smooth surfaces allowed Small segments removed Topographic map More map points needed in 3D Interchange in 2D Interchange in 3D
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Adding height to map points Interpolation Use laser points in nearest dominant segment For every neighbouring object Detect multiple heights Add semantics Water = horizontal Average if close Road = smooth
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Adding height to map points Interpolation Use laser points in nearest dominant segment For every neighbouring object Detect multiple heights Add semantics Water = horizontal Average if close Road = smooth
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Reconstruct new polygons Multiple levels Interchange in 3D Hidden polygons New polygons
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Adding height to surfaces Laser data Add to meadow etc. Perform morphological filtering near edges Modelling Roads, buildings, water
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Results
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At the moment… Adding knowledge to program: Merging road segments correctly Detect & correct fusion errors automatically Preparing 4 presentations (feedback) And the next moment… Building reconstruction Quality measures for 3D map
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Conclusions Complex infrastructural objects can be reconstructed in 3D New polygons are created where needed Not yet correctly, or not yet automatically
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INTERNATIONAL INSTITUTE FOR GEO-INFORMATION SCIENCE AND EARTH OBSERVATION Thank you for your attention. Questions?
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