Accuracy of cultural heritage 3D models by RPAS and terrestrial photogrammetry

Abstract

ABSTRACT:The combined use of high-resolution digital images taken from ground as well as from RPAS (Remotely Piloted Aircraft Systems) have significantly increased the potential of close range digital photogrammetry applications in Cultural Heritage surveying and modeling. It is in fact possible, thanks to SfM (Structure from Motion), to simultaneously process great numbers of aerial and terrestrial images for the production of a dense point cloud of an object. In order to analyze the accuracy of results, we started numerous tests based on the comparison between 3D digital models of a monumental complex realized by the integration of aerial and terrestrial photogrammetry and an accurate TLS (Terrestrial Laser Scanner) reference model of the same object. A lot of digital images of a renaissance castle, assumed as test site, have been taken both by ground level and by RPAS at different distances and flight altitudes and with different flight patterns. As first step of the experimentation, the images were previously processed with Agisoft PhotoScan, one of the most popular photogrammetric software. The comparison between the photogrammetric DSM of the monument and a TLS reference one was carried out by evaluating the average deviation between the points belonging to the two entities, both globally and locally, on individual façades and architectural elements (sections and particular). In this paper the results of the first test are presented. A good agreement between photogrammetric and TLS digital models of the castle is pointed out.

Authenticity through VR-based documentation of cultural heritage. A theoretical approach based on conservation and documentation practices

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Uav Photgrammetric Workflows: A Best Practice Guideline

“…Special Task UAVs (combat/decoys systems) (Nex and Remondino, 2014) The dissertation of Eisenbeiss provides an alternate way in which UAVs can be classified, which is by being considered as unpowered or powered, as well as lighter than air or heavier than air (Eisenbeiß, 2009 (Eisenbeiß, 2009) From the literature explored throughout this review, in relation to variables such as low cost and usability, the most common platform used for aerial photogrammetry are rotary wing aircraft. Specifically, multi-rotors, which include quadcopters, hexacopters, and octocopters, were seen in the articles read (Aicardi et al, 2016;Bolognesi et al, 2015;Bolognesi et al, 2014;Faltýnová et al, 2016;Fiorillo et al, 2013;Hashim et al, 2012;Stek, 2016;Sun and Cao, 2015).…”

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“…A common theme throughout the articles was the goal of low cost data acquisition. After reviewing the cost of the UAVs used in some of the test flights (Bolognesi et al 2015(Bolognesi et al , 2014Sun and Cao 2015) the average was around $2000 USD, which can be used as a benchmark figure to compare future UAV tests. Some common UAVs at that price point or lower include the DJI Phantom 4 and 4 Pro, 3DR Solo, and Yuneec Typhoon (myfirstdrone.com 2017).…”

Quality Analysis on 3d Buidling Models Reconstructed From Uav Imagery

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