Maximizing the microscope: instrument design and data processing strategies for hyperspectral imaging of cross-sectional cultural heritage samples

Males, Billie; Oakley, Lindsay H.; Cossairt, Oliver; Walton, Marc

doi:10.1117/12.2526098

Cited by 1 publication

(2 citation statements)

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“…The different spectrometry techniques are focused on the analysis of the composition of materials. Portable equipment such as hyperspectral cameras, RX equipment or spectroradiometers, make it possible to perform analysis of this nature without the need to extract a sample for laboratory analysis [33][34][35]. Working methods with the spectral techniques applied to heritage are described in [33].…”

Section: Introductionmentioning

confidence: 99%

“…Works of art are catalogued. For the cataloging of these, given the size and manageability, the analysis of spectral nature in order to establish similarities and differences between the pigments of different areas of the same work, has been of greater application [33,36,37]. For buildings, the use of these techniques is focused on archaeological and constructive studies as shown in [34,35].…”

Section: Introductionmentioning

confidence: 99%

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Tower of Belém (Lisbon)–Status Quo 3D Documentation and Material Origin Determination

Redweik

Blasco

Sánchez-Fernández

et al. 2020

Sensors

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The Tower of Belém, an early 16th century defense tower located at the mouth of the Tagus river, is the iconic symbol of Lisbon. It belongs to the Belém complex, classified since 1983 as a World Heritage Site by the UNESCO, and it is the second most visited monument in Portugal. On November 1st, 1755, there was a heavy earthquake in Lisbon followed by a tsunami, causing between 60,000 and 100,000 deaths. There is a possibility of a repetition of such a catastrophe, which could bring about the collapse of the structure. This was the reasoning behind the decision to evaluate the Tower of Belém by means of surveys using Terrestrial Laser Scanning and photogrammetry. Until now, there was no high-resolution 3D model of the interior and exterior of the tower. A complete 3D documentation of the state of the Tower was achieved with a cloud of more than 6,200 million 3D points in the ETRS89 PT-TM06 coordinate system. Additionally, measurements were made using a hyperspectral camera and a spectroradiometer to characterize the stone material used in the Tower. The result is a digital 3D representation of the Tower of Belém, and the identification of the quarries that may have been used to extract its stone. The work carried out combines geometrical and material analysis. The methods used may constitute a guide when documenting and intervening in similar heritage elements. Finally, the information contained therein will allow an eventual reconstruction of the Tower in the case of another catastrophe.

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