Detection of systematic displacements in spatial databases using linear elements |
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| Authors: | AT Mozas-Calvache FJ Ariza-López |
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| Institution: | 1. Department of Cartographic, Geodetic Engineering and Photogrammetry, University of Jaén, Campus Las Lagunillas sn. Edificio A3, Jaén, Spainantmozas@ujaen.es;3. Department of Cartographic, Geodetic Engineering and Photogrammetry, University of Jaén, Campus Las Lagunillas sn. Edificio A3, Jaén, Spain |
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| Abstract: | In this paper, we use control methodologies based on lines to detect the type of positional errors which affect a spatial database (SDB) and more concretely the presence of systematic errors. The methodology involves determination of the displacement vectors between the lines and a graphical and statistical study of the components obtained. The graphical analysis enables the detection of spatial patterns of displacement; the presence or absence of systematic errors is then confirmed by statistical analysis. We have applied this method to detect systematic errors on a set of lines with introduced displacements, rotations and scale changes. The results show the viability of the method. All the bias effects introduced were detected, both qualitatively and quantitatively. The detection method has the potential to minimize the effects of such displacements in the SDBs. |
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| Keywords: | quality uncertainty positional accuracy linear elements |
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