Nowadays, innovative survey technologies - such as laser scanning - are a valuable tool for the comprehension and the graphic expression of historical buildings, especially when they are not easily traceable to definite forms, as often happens for urban irregular squares. Historical geometries that have been designed according to ideal conditions but which are then built following the principle of adaptation to the morphology of the existing city or the terrain, accompanying its valleys and its undulations, and which are, even today, parts of the city not adequately known and/or thoroughly investigated. The representation of these realities remains inaccurate and approximate, both because of the survey's difficulties and of the natural human predisposition to regulate what (in reality) is highly irregular, in order to reduce it to simple and rigorous models. On the contrary to the "human" operator, the laser scanning methodology highlights what it detects without "rationally" interpreting data and by mechanically measuring, without preconceptions or hierarchical logical interpretations, everything that falls within the maximum instrumented range. The irregularity of the urban "empty" imposes different projection techniques to understand and return the actual geometry; each representation is a partial view, at times, not pleasant in graphics terms, but very useful and meaningful in its content. In particular, the control of the space shall obtained by doing cross-sections along the principal axes of the streets which can provide general information on the slopes but that lost detail when the buildings are seen in too foreshortened through orthographic projections. The latter appear to be partial if compared to the strings of individual buildings which allow, instead, to obtain much more detailed indications on the fronts. In addition, representations made by means of cylindrical projections allow you to appreciate the prospects of each building unit and place them in comparison with each other. This paper focuses on the case study of Piazza Regina Margherita in Enna, located in the Central Sicily's province of Enna. Their location, size and characteristics were studied in the 17th century in order to meet a precise ratio mathematica belonging to the culture of the era. For centuries, hearth of the city life and architectural gem, today the square is no longer the focal point of the city and is plagued by an incessant traffic and subject to dramatic degradation. Through this example, this paper intends to propose a survey methodology for the survey and graphical restitution of irregular geometry based on the use of modern technology able to complete the difficult process of knowledge and understanding, essential to the elaboration of the conservation and valorization projects.

Rappresentazione grafica per il restauro di geometrie irregolari: il caso studio di piazza Regina Margherita a Leonforte

VERSACI, ANTONELLA;
2012

Abstract

Nowadays, innovative survey technologies - such as laser scanning - are a valuable tool for the comprehension and the graphic expression of historical buildings, especially when they are not easily traceable to definite forms, as often happens for urban irregular squares. Historical geometries that have been designed according to ideal conditions but which are then built following the principle of adaptation to the morphology of the existing city or the terrain, accompanying its valleys and its undulations, and which are, even today, parts of the city not adequately known and/or thoroughly investigated. The representation of these realities remains inaccurate and approximate, both because of the survey's difficulties and of the natural human predisposition to regulate what (in reality) is highly irregular, in order to reduce it to simple and rigorous models. On the contrary to the "human" operator, the laser scanning methodology highlights what it detects without "rationally" interpreting data and by mechanically measuring, without preconceptions or hierarchical logical interpretations, everything that falls within the maximum instrumented range. The irregularity of the urban "empty" imposes different projection techniques to understand and return the actual geometry; each representation is a partial view, at times, not pleasant in graphics terms, but very useful and meaningful in its content. In particular, the control of the space shall obtained by doing cross-sections along the principal axes of the streets which can provide general information on the slopes but that lost detail when the buildings are seen in too foreshortened through orthographic projections. The latter appear to be partial if compared to the strings of individual buildings which allow, instead, to obtain much more detailed indications on the fronts. In addition, representations made by means of cylindrical projections allow you to appreciate the prospects of each building unit and place them in comparison with each other. This paper focuses on the case study of Piazza Regina Margherita in Enna, located in the Central Sicily's province of Enna. Their location, size and characteristics were studied in the 17th century in order to meet a precise ratio mathematica belonging to the culture of the era. For centuries, hearth of the city life and architectural gem, today the square is no longer the focal point of the city and is plagued by an incessant traffic and subject to dramatic degradation. Through this example, this paper intends to propose a survey methodology for the survey and graphical restitution of irregular geometry based on the use of modern technology able to complete the difficult process of knowledge and understanding, essential to the elaboration of the conservation and valorization projects.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11387/10108
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