Photoplan is a photographic image corrected and rectified so that the image plane represents the plan of the real object in scale and metrically measurably. Of intuitive understanding in the case of walls, floors etc., it become more complex in the case of curved surfaces or overhangs, where a virtual plane must be identified, to orthogonally project the surface without deforming it. This is impossible with a single photograph, where the central point of view produces perspective deformations. The solution is the orthophoto , or a parallel projection of a three-dimensional model view taken along a predetermined plan. Orthophotoplan is a product of mapping, namely the zenith photographic satellite image rectified and mosaicked.
Published in Chapter:
Integrated Survey of “Quadrature” Aimed at the Graphical Analysis of Painted Perspective: Trompe l'Oeil Architecture, Palazzo Arese Borromeo
Donatella Bontempi (University of Parma, Italy) and Giorgia Bianchi (University of Parma, Italy)
Copyright: © 2017
|Pages: 35
DOI: 10.4018/978-1-5225-0680-5.ch016
Abstract
The issue of knowledge and documentation of cultural heritage is always central in the field of Drawing, which, through the survey, is always preliminary to the safeguarding and valorisation of artistic and architectural heritage. The paper aims at presenting some results of a survey realized following an approach that mix direct, laser and photographic techniques to obtain high quality ortophotos of the painted surfaces, useful to be the basis for the graphical analysis of the trompe l'oeil perspective. The phases are: survey campaign and data acquisition, postproduction of the RAW file, photo straightening, photo modelling, orthophoto output, CAD analysis, conclusive considerations. All these steps are referred to the experimentation on a concrete case study, one of the numerous frescoed rooms belonging to the rich iconography of Palazzo Arese Borromeo in Cesano Maderno (MB, Italy), a building that is an actual unicum in its kind.