3d Cultural Heritage Documentation: A Comparison Between Different Photogrammetric Software and Their Products

Abstract

ABSTRACT:The conservation of Cultural Heritage depends on the availability of means and resources and, consequently, on the possibility to make effective operations of data acquisition. In facts, on the one hand the creation of data repositories allows the description of the present state-of-art, in order to preserve the testimonial value and to permit the fruition. On the other hand, data acquisition grants a metrical knowledge, which is particularly useful for a direct restoration of the surveyed objects, through the analysis of their 3D digital models. In the last decades, the continuous increase and improvement of 3D survey techniques and of tools for the geometric and digital data management have represented a great support to the development of documentary activities. In particular, Photogrammetry is a survey technique highly appropriate in the creation of data repositories in the field of Cultural Heritage, thanks to its advantages of cheapness, flexibility, speed, and the opportunity to ensure the operators' safety in hazardous areas too. In order to obtain a complete documentation, the high precision of the on-site operations must be coupled with an effective post-processing phase. Hence, a comparison among some of the photogrammetric software currently available was performed by the authors, with a particular attention to the workflow completeness and the final products quality.

2D & 3D RECONSTRUCTION WORKFLOWS FROM ARCHIVE IMAGES, CASE STUDY OF DAMAGED MONUMENTS IN BOSRA AL-SHAM CITY (SYRIA)

“…In a second stage, we used the M3C2 plugin of CloudCompare to compute signed distances directly between two point clouds. In the output section, the projection of the core points is done keeping original positions; in this way, a new cloud is generated, containing the differences between the tested point clouds (Gagliolo, 2018). The distribution of the differences has been represented with a Gaussian distribution and Table 8 shows the mean and the standard deviation.…”

Low-Cost Technological Implementations Related to Integrated Application Experiments

“…In a second phase, Cloud Compare's internal plugin M3C2 directly calculated the distances between overlapping point clouds. In the output section, the projection method of the fundamental points is done keeping the original; in this way, a new cloud is generated, containing the differences between the point clouds tested (Gagliolo, 2018). The two solutions show an error of correspondence with the point cloud of the commercial software Agisoft (1.68051e-006): -0.0215 for Regard3d, and -0.0002 for Meshroom, demonstrating a slightly greater reliability of the 3d model generated with the AliceVision software.…”

Casa del Samarín, una estación de grabados rupestres en deterioro. Documentación, análisis y diagnóstico en Los Llanos de Ifara, Granadilla, Tenerife

“…Se trata de una aplicación de código abierto diseñada para administrar y comparar nubes de puntos de alta densidad y superficies de mallas. En la documentación geométrica del patrimonio, su cálculo de la desviación promedio entre dos modelos 3D se emplea con frecuencia como herramienta para el control de calidad de los registros (Rahaman & Champion, 2019;Gagliolo et al, 2018;Grifoni et al, 2018;Menna et al, 2016). Este tratamiento de la información también ofrece un gran potencial analítico dentro del campo de la conservación, ya que permite monitorizar cambios formales.…”