DBPapers
DOI: 10.5593/sgem2012/s08.v2008

STATISTICAL COMPARISON OF URBAN 3D MODELS FROM PHOTO MODELING AND AIRBORNE LASER SCANNING

C. STAL, A. DE WULF, P. DE MAEYER, R. GOOSSENS, M. HENDRICKX, T. NUTTENS, F. TACK
Wednesday 1 August 2012 by Libadmin2012

References: 12th International Multidisciplinary Scientific GeoConference, www.sgem.org, SGEM2012 Conference Proceedings/ ISSN 1314-2704, June 17-23, 2012, Vol. 2, 901 - 908 pp

ABSTRACT

Since a few years, structure from motion has been commercially applied and interesting
3D models are discussed in recent literature. Structure from motion is known to be a
relatively fast and low-cost technique for the generation of photo-realistic 3D models.
This technique uses a series of digital images taken from different positions. In this
image series, each part of the object is recorded on at least three images. Combining
these images with information from a metadata file allows to determine the different
camera positions and to calculate a textured mesh or colored point set in 3D, by solving
a system of geometric matrices. In this article, the geometric quality of urban airborne
digital surface models is assessed. These digital surface models are generated by
structure from motion. A statistical comparison is performed for an urban area between
models generated by structure from motion and models generated by a high density
reference point set, acquired by airborne laser scanning. The ease of processing the
images in professional software allows to consider structure from motion as an
alternative for conventional digital photogrammetry. Although the results for the visual
representations of the objects are good, a research on the geometrical accuracy of the
final products is discussed in this paper. The statistical analysis of the structure from
motion results and the digital surface models generated by other techniques, enables a
thorough comparison of the different techniques and the influence of terrain dependent
and terrain independent control points.

Keywords: Structure from Motion, airborne LiDAR, DSM, quality assessment