Multispectral Analysis of Indigenous Rock Art Using Terrestrial Laser Scanning

Abstract

ABSTRACT:Multispectral analysis is a widely used technique in the photogrammetric and remote sensing industry. The use of Terrestrial Laser Scanning (TLS) in combination with imagery is becoming increasingly common, with its applications spreading to a wider range of fields. Both systems benefit from being a non-contact technique that can be used to accurately capture data regarding the target surface. Although multispectral analysis is actively performed within the spatial sciences field, its extent of application within an archaeological context has been limited. This study effectively aims to apply the multispectral techniques commonly used, to a remote Indigenous site that contains an extensive gallery of aging rock art. The ultimate goal for this research is the development of a systematic procedure that could be applied to numerous similar sites for the purpose of heritage preservation and research. The study consisted of extensive data capture of the rock art gallery using two different TLS systems and a digital SLR camera. The data was combined into a common 2D reference frame that allowed for standard image processing to be applied. An unsupervised k-means classifier was applied to the multiband images to detect the different types of rock art present. The result was unsatisfactory as the subsequent classification accuracy was relatively low. The procedure and technique does however show potential and further testing with different classification algorithms could possibly improve the result significantly.

Análisis de las metodologías para la documentación del arte rupestre. En busca de las técnicas más adecuadas

“…Para finalizar este paso generaremos la malla de la nube de puntos obtenida en la documentación, eliminando zonas oscuras no deseadas (Lerma García et al 2010). El siguiente proceso sería el de texturización creando un modelo en 3D, el cual resulta una réplica bastante exacta del original (Skoog et al 2016). Indicar que con esta tecnología también somos capaces de revelar pinturas ocultas tras ciertos materiales (Jalandoni et al 2021), o incluso aclarar superposiciones.…”

Unmanned aerial vehicle and structure‐from‐motion photogrammetry for three‐dimensional documentation and digital rubbing of the Zuo River Valley rock paintings

“…In the past few years, several methodologies for obtaining and processing the geospatial data of rock paintings have been used to generate orthoimages, 3D models, and rubbings that present reality. These methodologies include terrestrial laser scanning, close‐range photogrammetry, and aerial photogrammetry (Chandler, Bryan, & Fryer, ; Chandler, Fryer, & Kniest, ; Lerma, Navarro, Cabrelles, Seguí, & Hernández, ; Meléndez, Lerma, López Montalvo, & Villaverde, ; Plisson & Zotkina, ; Skoog, Helmholz, & Belton, ).…”