The new technologies solved some of the problems of surveying, for example, accelerating data collecting, yielding graphic models less subject to interpretation and more adequately corresponding to reality, or offering the possibility to reproduce the graphic models many times with the view to sharing it with other researchers and scholars. The technology developed in the last twenty years makes it possible to obtain millions of points almost automatically in ever-shorter spans of time. The great advantage of the innovative technologies is that they make it possible to create models of objects characterized by a density of metric and geometric information that no traditional surveying method can yield. This new technologies constitute an useful and flexible tool to restitute a great part of scientific documentation on Cultural Heritage. This paper precisely presents the City of La Havana (Cuba): a series of buildings overlooking the five main squares located in its historic center have been taken into consideration. The process of surveying is conducted with a set of techniques. The acquired data are observable, empirical and measurable with the uncertainty level stated a priori and strictly controlled. Moreover, they can be archived and shared, and thus can be assessed autonomously. Also, all the procedures applied are replicable and therefore it is possible to acquire new sets of information for making comparisons. The SFM technique was applied to the Cuban case study; Structure from motion technique is a digital technology able to generate three-dimensional clouds of points departing from simple raster images. Today, digital technologies at our disposal impose the necessity to analyze in depth hardware and software that work together at all the stages of surveying (acquisition, elaboration, modelling and – obviously – CAD drawing). On the one hand, it is precisely this equipment that allows one to acquire points quickly and without difficulties relative to the volume of the object and the detail level (it is possible to survey artifacts of great dimensions and geometrically complex). On the other hand, the representation of surfaces acquired cannot be said to be so direct. The more relevant the complexity of the object, the more operations are necessary while difficulty level requisite for its representation soars. That is precisely why we are wary of the equipment which executes the whole process fully automatically in favor of semi-automatic processes which allow the operator to intervene in order to select the material, taking into account his knowledge of history and geometry, and to decide which surfaces will be the best for reconstructing the model with the greatest fidelity to reality. Each digital model has to be assigned a scale reference in close relationship with its geometric and perceptual characteristics. We consider it worthwhile to ponder the way in which the information has to be acquired in reference to the enormous possibilities opened up by digital technologies of surveying and representation.
Quality Tools for Improving a System of Documentation from Cultural Heritage of Habana (Cuba)
Caterina MORGANTI
;Cristiana BARTOLOMEI
;
2018
Abstract
The new technologies solved some of the problems of surveying, for example, accelerating data collecting, yielding graphic models less subject to interpretation and more adequately corresponding to reality, or offering the possibility to reproduce the graphic models many times with the view to sharing it with other researchers and scholars. The technology developed in the last twenty years makes it possible to obtain millions of points almost automatically in ever-shorter spans of time. The great advantage of the innovative technologies is that they make it possible to create models of objects characterized by a density of metric and geometric information that no traditional surveying method can yield. This new technologies constitute an useful and flexible tool to restitute a great part of scientific documentation on Cultural Heritage. This paper precisely presents the City of La Havana (Cuba): a series of buildings overlooking the five main squares located in its historic center have been taken into consideration. The process of surveying is conducted with a set of techniques. The acquired data are observable, empirical and measurable with the uncertainty level stated a priori and strictly controlled. Moreover, they can be archived and shared, and thus can be assessed autonomously. Also, all the procedures applied are replicable and therefore it is possible to acquire new sets of information for making comparisons. The SFM technique was applied to the Cuban case study; Structure from motion technique is a digital technology able to generate three-dimensional clouds of points departing from simple raster images. Today, digital technologies at our disposal impose the necessity to analyze in depth hardware and software that work together at all the stages of surveying (acquisition, elaboration, modelling and – obviously – CAD drawing). On the one hand, it is precisely this equipment that allows one to acquire points quickly and without difficulties relative to the volume of the object and the detail level (it is possible to survey artifacts of great dimensions and geometrically complex). On the other hand, the representation of surfaces acquired cannot be said to be so direct. The more relevant the complexity of the object, the more operations are necessary while difficulty level requisite for its representation soars. That is precisely why we are wary of the equipment which executes the whole process fully automatically in favor of semi-automatic processes which allow the operator to intervene in order to select the material, taking into account his knowledge of history and geometry, and to decide which surfaces will be the best for reconstructing the model with the greatest fidelity to reality. Each digital model has to be assigned a scale reference in close relationship with its geometric and perceptual characteristics. We consider it worthwhile to ponder the way in which the information has to be acquired in reference to the enormous possibilities opened up by digital technologies of surveying and representation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.