Survey problems and representation of architectural painted

We know that the basis of a survey is always choice, selection and discretization of the elements. In the case of a geometric transformation, in order to produce a flat representation of the detected surface detected, this smust be approximated to a combination of developable geometric shapes. Having no specific references in the field of architectural survey we can intervene on the basis of similar experiments made by the mapping used to to develope solutions to similar problems. It Is therefore essential to analyze patterns of map projections in order to have a useful starting point to develop a new projection model to be proposed. We can then synthesize a first list of the various geometric problems and how they might be faced: - When a series of paintings is done on a flat surface, or comparable to it, the simple projection in accordance with the mere seconds the attitude average projection produces a correct image. - If we have a ruled surface this can be developed and then the two-dimensional representation can be obtained by graphical and numerical processing, separately from the three-dimensional model that show a not 'measurable' vision. This possibility is very important, for example, in cases of restoration but also simply for a more complete overview. This is a secure plug-in required different program in the graphics used for the architectural survey. Limited to cylindrical surfaces the development can be made with the software for stiching panoramas. In fact, you run to shoot pictures with the camera positioned with the front nodal point on the axis will and then you obtain geometric, landscape, or a cylindrical projection developed. - The third case is that of non-developable surfaces, such as spherical surfaces or other even more complex. Often we can seek help from stereographic projection used in cartography. All map projections are carried out mainly in two phases: the first project the ellipsoidal surface of the earth of a ruled surface and develop as a cylinder or cone, and the second provides for its development in the plan, other procedures limited project areas directly on a plane. The different analytical techniques-projective possible to respect some parameters useful to the end use of the card. So we have: equivalence, when the area ratio is maintained; Isogon, when retained in the corners, equidistance, when you keep the ratio of distances. Just the equivalence would seem the most appropriate feature to an application for heritage conservation.