The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
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Articles | Volume XLI-B3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 123–130, 2016
https://doi.org/10.5194/isprs-archives-XLI-B3-123-2016
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLI-B3, 123–130, 2016
https://doi.org/10.5194/isprs-archives-XLI-B3-123-2016

  09 Jun 2016

09 Jun 2016

EXTERIOR ORIENTATION ESTIMATION OF OBLIQUE AERIAL IMAGERY USING VANISHING POINTS

Styliani Verykokou and Charalabos Ioannidis Styliani Verykokou and Charalabos Ioannidis
  • Laboratory of Photogrammetry, School of Rural and Surveying Engineering, National Technical University of Athens, Greece

Keywords: Oblique Aerial Images, Vanishing Point, Nadir Point, True Horizon Line, Exterior Orientation, Georeferencing

Abstract. In this paper, a methodology for the calculation of rough exterior orientation (EO) parameters of multiple large-scale overlapping oblique aerial images, in the case that GPS/INS information is not available (e.g., for old datasets), is presented. It consists of five main steps; (a) the determination of the overlapping image pairs and the single image in which four ground control points have to be measured; (b) the computation of the transformation parameters from every image to the coordinate reference system; (c) the rough estimation of the camera interior orientation parameters; (d) the estimation of the true horizon line and the nadir point of each image; (e) the calculation of the rough EO parameters of each image. A developed software suite implementing the proposed methodology is tested using a set of UAV multi-perspective oblique aerial images. Several tests are performed for the assessment of the errors and show that the estimated EO parameters can be used either as initial approximations for a bundle adjustment procedure or as rough georeferencing information for several applications, like 3D modelling, even by non-photogrammetrists, because of the minimal user intervention needed. Finally, comparisons with a commercial software are made, in terms of automation and correctness of the computed EO parameters.