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Reconstructing Buildings with Discontinuities and Roof Overhangs from Oblique Aerial Imagery

Frommholz, Dirk and Linkiewicz, Magdalena and Meißner, Henry and Dahlke, Dennis (2017) Reconstructing Buildings with Discontinuities and Roof Overhangs from Oblique Aerial Imagery. In: International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives, XLII-1 (W1), pp. 465-471. Copernicus Publications. ISPRS Hannover Workshop: HRIGI 17 - CMRT 17 - ISA 17 - EuroCOW 17, 06. - 09. Juni 2017, Hannover, Germany. doi: 10.5194/isprs-archives-XLII-1-W1-465-2017.

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Official URL: http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XLII-1-W1/465/2017/


This paper proposes a two-stage method for the reconstruction of city buildings with discontinuities and roof overhangs from oriented nadir and oblique aerial images. To model the structures the input data is transformed into a dense point cloud, segmented and filtered with a modified marching cubes algorithm to reduce the positional noise. Assuming a monolithic building the remaining vertices are initially projected onto a 2D grid and passed to RANSAC-based regression and topology analysis to geometrically determine finite wall, ground and roof planes. If this should fail due to the presence of discontinuities the regression will be repeated on a 3D level by traversing voxels within the regularly subdivided bounding box of the building point set. For each cube a planar piece of the current surface is approximated and expanded. The resulting segments get mutually intersected yielding both topological and geometrical nodes and edges. These entities will be eliminated if their distance-based affiliation to the defining point sets is violated leaving a consistent building hull including its structural breaks. To add the roof overhangs the computed polygonal meshes are projected onto the digital surface model derived from the point cloud. Their shapes are offset equally along the edge normals with subpixel accuracy by detecting the zero-crossings of the second-order directional derivative in the gradient direction of the height bitmap and translated back into world space to become a component of the building. As soon as the reconstructed objects are finished the aerial images are further used to generate a compact texture atlas for visualization purposes. An optimized atlas bitmap is generated that allows perspectivecorrect multi-source texture mapping without prior rectification involving a partially parallel placement algorithm. Moreover, the texture atlases undergo object-based image analysis (OBIA) to detect window areas which get reintegrated into the building models. To evaluate the performance of the proposed method a proof-of-concept test on sample structures obtained from real-world data of Heligoland/Germany has been conducted. It revealed good reconstruction accuracy in comparison to the cadastral map, a speed-up in texture atlas optimization and visually attractive render results.

Item URL in elib:https://elib.dlr.de/112585/
Document Type:Conference or Workshop Item (Poster)
Title:Reconstructing Buildings with Discontinuities and Roof Overhangs from Oblique Aerial Imagery
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Date:2 June 2017
Journal or Publication Title:International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:pp. 465-471
Publisher:Copernicus Publications
Keywords:Aerial, Oblique, Building Reconstruction, Discontinuities, Roof Overhangs, Texture Mapping, CityGML
Event Title:ISPRS Hannover Workshop: HRIGI 17 - CMRT 17 - ISA 17 - EuroCOW 17
Event Location:Hannover, Germany
Event Type:international Conference
Event Dates:06. - 09. Juni 2017
Organizer:IPI Hannover
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Optical remote sensing for security-relevant applications, R - Optical Technologies and Applications
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Sensor Concepts and Applications
Deposited By: Frommholz, Dirk
Deposited On:06 Jun 2017 08:30
Last Modified:31 Jul 2019 20:09

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