ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Publications Copernicus
Articles | Volume I-4
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., I-4, 13–18, 2012
ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., I-4, 13–18, 2012

  16 Jul 2012

16 Jul 2012


S. Dalyot1, T. Dahinden1, M. J. Schulze1, J. Boljen2, and M. Sester1 S. Dalyot et al.
  • 1Institut für Kartographie und Geoinformatik, Leibniz Universität Hannover, Appelstraße 9a, 30167 Hannover, Germany
  • 2Landesamt für Vermessung und Geoinformation Schleswig-Holstein, Mercatorstraße 1, 24106 Kiel, Germany

Keywords: Matching, Adjustment, Cartography, Geometry, Databases, GIS, Automation, Algorithms

Abstract. Comparison of geospatial databases presenting similar spatial extent might show substantial differences. This is the consequence of different factors, such as: accuracy, scale, data collection and processing methods, level-of-detail, data models – to name a few. The differences are reflected in the geometric structure of objects, location, topology and the accompanying information. Geometric discrepancies are emerging, and sometimes even contradictions exist between the various data sources. Thus, the demand for processes that enable alignment of different data sources while maintaining spatial consistency is growing. Global solution strategies, such as an affine transformation, are incomplete solutions since discrepancies are still likely to exist due to the inability of such a global solution to account for the remaining errors due to local distortions. In order to account for the resulting random distortions, e.g., geometric conflicts, a localized geometric alignment process is implemented in this research. During this process the distortions (deviations) are quantified locally via sets of specifically selected observation constraints, to assure the spatial consistency of the vector data. This strategy exploits local spatial topologic and geometric relationships between corresponding line-features prior to the implementation of Least Squares Adjustment for the alignment, and observes local distortions and ambiguities that might exist. The outcome presents a significant improvement of the initial state by resolving local geometric distortions and discrepancies, suggesting a reliable solution for the problem on a statistically sound basis.