Abstract
Abstract. The integration of the fourth dimension into the geospatial data allows to generate a diachronic model of Cultural Heritage (CH) assets, namely, a set of 3D models to represent it in various historical phases. This kind of reconstruction pursues a better understanding of the CH site/scenario, enriching the historical hypotheses as well as contributing to the conservation and decisionmaking process. Although the new geotechnologies have reduced the amount of fieldwork, the generation of 4D model implies the interpretation of heterogeneous historical information sources and their integration. However, this situation could reach a critical point when the study elements are no longer present. Their reconstruction will allow the digital preservation and maintenance of our culture. The main challenge is to harmonize the different historical and archaeological data sources available in relation with the current remains, to recover the lost CH assets with a high degree of reliability. This manuscript aims to examine the study case of a diachronic reconstruction by means of the use of the geotechnology Mobile Laser System (MLS) and reverse engineering techniques for a lost urban CH element, the citadel or Alcázar Gate of Ávila. Within this aim, the derived product is evaluated in terms of the achieved accuracy to assess its suitability on the basis of constructive interpretations required to integrate the historical sources in relation to current remains and the surrounding.
Highlights
Geotechnologies can be defined as the set of sensors and computer algorithms that allows the acquisition, modelling and analysis of spatial features focused on knowledge generation for any level of detail and discipline that have to manage changes in space and/or time
This paper presents an approach to this goal through the diachronic reconstruction of lost cultural heritage sites, in our case the Alcázar Gate and its surroundings which belongs today to the Medieval Wall of Avila (Spain), declared Good of Cultural Interest by UNESCO in 1982
This paper aims to solve these challenges using the Alcázar Gate and its surroundings as a case of study
Summary
Geotechnologies can be defined as the set of sensors and computer algorithms that allows the acquisition, modelling and analysis of spatial features (individually or together) focused on knowledge generation for any level of detail and discipline that have to manage changes in space and/or time. With the aim of studying the current state and the geometry of a CH element, various geotechnologies can be used: from airborne to ground level, such as laser scanning, photogrammetry, or global navigation satellite systems (TorresMartinez et al, 2016). Their fusion and hybridization are being studied, and in spite of several approaches available (Ramos and Remondino, 2015), this issue still represent a hot topic for the Scientific Community (Chen et al, 2017). The registered point clouds can be reconstructed to provide a parametric modelling of the historical building (Dore and Murphy, 2012), or by means of non-parametric shapes
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