Combining InfraRed Thermography and UAV Digital Photogrammetry for the Protection and Conservation of Rupestrian Cultural Heritage Sites in Georgia: A Methodological Application

Frodella, William; Elashvili, Mikheil; Spizzichino, Daniele; Gigli, Giovanni; Adikashvili, Luka; Vacheishvili, Nikoloz; Kirkitadze, Giorgi; Nadaraia, Akaki; Margottini, Claudio

doi:10.3390/rs12050892

Cited by 48 publications

(38 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Volcano monitoring [43][44][45][46], underground mining [36], cave exploration [47], and geothermal analyses [48] can benefit from IRT technologies. Landslide and rockfall mapping by IRT also have been attempted [37,39,[49][50][51][52][53][54] (Table 1).…”

Section: Introductionmentioning

confidence: 99%

An Infrared Thermography Approach to Evaluate the Strength of a Rock Cliff

et al. 2021

View full text Add to dashboard Cite

The mechanical strength is a fundamental characteristic of rock masses that can be empirically related to a number of properties and to the likelihood of instability phenomena. Direct field acquisition of mechanical information on tall cliffs, however, is challenging, particularly in coastal and alpine environments. Here, we propose a method to evaluate the compressive strength of rock blocks by monitoring their thermal behaviour over a 24‐h period by infrared thermography. Using a drone‐mounted thermal camera and a Schmidt (rebound) hammer, we surveyed granitoid and aphanitic blocks in a coastal cliff in south‐east Sardinia, Italy. We observed a strong correlation between a simple cooling index, evaluated in the hours succeeding the temperature peak, and strength values estimated from rebound hammer test results. We also noticed different heatingcooling patterns in relation to the nature and structure of the rock blocks and to the size of thefractures. Although further validation is warranted in different morpho‐lithological settings, we believe the proposed method may prove a valid tool for the characterisation of non‐directly accessible rock faces, and may serve as a basis for the formulation, calibration, and validation of thermo‐hydro‐mechanical constitutive models.

show abstract

Section: Introductionmentioning

confidence: 99%

An Infrared Thermography Approach to Evaluate the Strength of a Rock Cliff

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Infrared (IR) cameras are devices generally operating in the mid-infrared band of the electromagnetic radiation spectrum (7.5-14 µm). IR sensors can quantify and convert the emitted infrared radiation into temperature values through their built-in processors [28]. The output of IR cameras is a radiometric image (i.e., thermogram) that consists of a pixel matrix describing the surface temperatures of the object under investigation.…”

Section: Infrared Thermography Surveymentioning

confidence: 99%

3D Thermal Monitoring of Jointed Rock Masses through Infrared Thermography and Photogrammetry

et al. 2021

View full text Add to dashboard Cite

The study of strain effects in thermally-forced rock masses has gathered growing interest from engineering geology researchers in the last decade. In this framework, digital photogrammetry and infrared thermography have become two of the most exploited remote surveying techniques in engineering geology applications because they can provide useful information concerning geomechanical and thermal conditions of these complex natural systems where the mechanical role of joints cannot be neglected. In this paper, a methodology is proposed for generating point clouds of rock masses prone to failure, combining the high geometric accuracy of RGB optical images and the thermal information derived by infrared thermography surveys. Multiple 3D thermal point clouds and a high-resolution RGB point cloud were separately generated and co-registered by acquiring thermograms at different times of the day and in different seasons using commercial software for Structure from Motion and point cloud analysis. Temperature attributes of thermal point clouds were merged with the reference high-resolution optical point cloud to obtain a composite 3D model storing accurate geometric information and multitemporal surface temperature distributions. The quality of merged point clouds was evaluated by comparing temperature distributions derived by 2D thermograms and 3D thermal models, with a view to estimating their accuracy in describing surface thermal fields. Moreover, a preliminary attempt was made to test the feasibility of this approach in investigating the thermal behavior of complex natural systems such as jointed rock masses by analyzing the spatial distribution and temporal evolution of surface temperature ranges under different climatic conditions. The obtained results show that despite the low resolution of the IR sensor, the geometric accuracy and the correspondence between 2D and 3D temperature measurements are high enough to consider 3D thermal point clouds suitable to describe surface temperature distributions and adequate for monitoring purposes of jointed rock mass.

show abstract

“…In addition, drones play a key role for the 3D reconstruction in archaeology. Frequently, the archaeological remains are in places with a difficult access and irregular terrain, so UAV-based solutions are a better option than LIDAR [4,8]. UAVs can capture overlapping images from multiple viewpoints surrounding the target object.…”

Section: Introductionmentioning

confidence: 99%

The UAS-Based 3D Image Characterization of Mozarabic Church Ruins in Bobastro (Malaga), Spain

et al. 2020

View full text Add to dashboard Cite

In recent years, the application of geomatics tools in archaeology has proved to be very useful to obtain meaningful knowledge of the 3D reconstruction of archaeological remains and semantic classification of the 3D surface. These techniques have proven to be an effective solution for the 3D modeling and the extraction of many spatial features on an archaeological site. However, novel methodologies as well as new data exploitation strategies are required to exploit these geospatial data for natural and cultural heritage documentation, monitoring, and preservation. In this paper, we have studied unique archaeological ruins, a Mozarab church in Al-Andalus, using high-resolution RGB images, which was taken by a drone. Thus, a 3D reconstruction of the ruins and the surrounding environment is carried out in order to characterize it on a dense point cloud. Then, a digital elevation model (DEM) was calculated in order to identify critical slope lines, which are significant to determine where the structure of the church was built. Our results can be used for the development of an architectural project and thus a virtual recreation of these archaeological ruins was performed.

show abstract

Combining InfraRed Thermography and UAV Digital Photogrammetry for the Protection and Conservation of Rupestrian Cultural Heritage Sites in Georgia: A Methodological Application

Cited by 48 publications

References 63 publications

An Infrared Thermography Approach to Evaluate the Strength of a Rock Cliff

An Infrared Thermography Approach to Evaluate the Strength of a Rock Cliff

3D Thermal Monitoring of Jointed Rock Masses through Infrared Thermography and Photogrammetry

The UAS-Based 3D Image Characterization of Mozarabic Church Ruins in Bobastro (Malaga), Spain

Contact Info

Product

Resources

About