Abstract
Abstract. The basis of the photogrammetric reconstruction of the altar at the monastery / church are 2 historic photos from around 1920’s as well as a 3D documentation of the church from terrestrial laser scanning. The point cloud from the laser scan was the starting point for an approximate computation of the interior and exterior orientation of that image that also contains parts of the altar area that still do exist. Using a projection of the recent geometry into the image allowed the analysis of changes of the altar ensemble since the time of image acquisition. Those parts that are still in situ are the origin for further action. Whether fragments and parts should be used further or newly positioned was decided in the next phase of reconstruction process. The focus of the first step of the workflow was at the outlines of the parts in the center of the altar. Using a monoplotting approach and assuming that the profiles are vertical and parallel to each other these object could be definitely compiled. Theses outlines also allowed an approximate determination of the interior and exterior orientation of the second historic photograph in which otherwise the complete connection to the recent altar area was missing. The side parts of the altar showed to be more complicated for reconstruction. The difference in depth of the varying edges could not be distinguished any more in the images. Such, the sequence and form of the different edges was adopted, scaled and transferred from the central part of the altar to the peripheral ones. Using this geometric information it was possible to define the necessary projection planes for the monoplotting restitution of the visible outlines. A concluding rigorous control was accomplished by back projection of the geometry into both historical images.
Highlights
The Capuchin congregation goes back to St
A back projection into the three-dimensional point cloud of the laser scan was used to break down the altar into elements that were unchanged, that had been reused in a new position and that no longer existed
In order to achieve a detailed survey on site, the present altar space was subject to detailed geometrical measurement with a terrestrial laser scanner
Summary
The Capuchin congregation goes back to St. Francis of Assisi and was founded by Ludwig of Fossombrone in the first half oft he 16th century. In 2014, the inner room was painted with lime paint, the original marble pavement excavated and restored and the guidelines for the reconstruction of the high altar where found in an interdisciplinary research project of photogrammetric reconstruction by the Surveying and Geoinformation Unit of the University of Innsbruck. According to this project it will be necessary to replace the altar in the original position, to reconstruct the lost broken pediment and to create a new oval painting and wings paintings.
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