Dem and Orthophoto Generation in Close Range Photogrammetry
While digital rectification may be often adequate to document architectural surveys, sometimes the object characteristics prevent such a simple approach. If a truly 3D object model is required, methods for automating object surface reconstruction become necessary, to reduce production time and costs and to avoid the use of highly qualified personnel. Though, at a first sight, just a side issue in the more general context of GIS for architecture, inexpensive and reliable methods for object reconstruction are crucial, since without a data acquisition stage actually affordable, GIS will not gain a foothold in architecture, but for a few, nice looking and expensive projects.
In the following we introduce an automatic approach to DEM generation, which makes use of an initial coarse DEM (to update iteratively) and of the epipolar constraint in order to limit the search space for corresponding points.
The procedure has been applied to a pair of photographs of an architectonic element of the church of S.Pietro in Ciel d’Oro in Pavia (Italy), to generate a digital orthophoto.
KeywordsSurface Reconstruction Spline Interpolation Conjugate Point Bundle Adjustment Epipolar Line
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