THE MULTI-IMAGE SPHERICAL PANORAMAS AS A TOOL FOR ARCHITECTURAL SURVEY

Abstract

The surveys of the interior of two churches in Italy, the Magdalene’s church in Pesaro, and San Dominic church in Arezzo, are shown and described as examples of a new photogrammetric technique. The first church is one of the most noticeable baroque architecture in the Marche region and it has been designed by the famous architect Luigi Vanvitelli in 18 th century, the second one is a large and simple church in Arezzo. The proposed technique is based on the multi-image spherical panoramas. For the formation of the plane image of the spherical panoramas the commercial software has been used. The spherical panorama can be regarded as the analogical recording of the angular observations of a theodolite having its center in the center of panorama. But to be set in operational conditions as a theodolite, the spherical panorama has to recover two rotation angles to set the verticality of its principal axis. The estimation of such rotation angles can be performed both in a preliminary phase prior to the plotting or in a unique phase in a block adjustment. Control points, control directions, geometric constraints such as verticality and horizontality of space lines, can be used. In these study-cases almost no one of such control information was necessary, but the only block adjustment was sufficient. The block adjustment finally furnishes the estimation of the unknown points coordinates together with the six orientation parameters per panorama, three translations and three rotations, by means of the known geodetic equations of the horizontal direction and the zenith angle, (modified to take into account the two horizontal correction angles), that are nothing else than the collinearity equations of the spherical panoramas. The technique of the spherical panoramas has previously been experimented and used for the survey of