https://doi.org/10.1145/3389189.3398000 Historic preservation of tangible cultural heritage asset... more https://doi.org/10.1145/3389189.3398000 Historic preservation of tangible cultural heritage assets is a process that goes beyond structural integrity to the restoration of the interior decorations, such as wall-paintings or icons since this provides a complete restoration process of the monuments that face both their architectural and functional elements. This process is imperative, as in a lot of cases parts of the assets (e.g., frescoes) are decayed or missing due to the passage of time and other environmental, natural or anthropogenic factors. An indicative paradigm of such a decay is the Byzantine churches in Meteora area, a UNESCO cultural heritage site in Greece. However, the limitations in taking samples from such sights indicate that before such fresco restoration process commences, we first need to semantically classify the monument surfaces into different material types, such as stone, mortar or frescoes. The research challenge imposes this semantic classification process is more evident in cases where the surfaces of the monument are not planar but complex, such as in many byzantine churches carved in rock in Meteora. In this paper, the semantic classification is achieved using a deep Convolutional Neural Network (CNN) which receives as input two types of data: RGB images of the frescoes to capture textural information and 3D cubes that encapsulate the geometric structure of the surface. RGB images describe visual complexity of the frescoes including texture maps and style. On the other hand, the 3D cubes include triangles of the surface, obtained using photogrammetric methods, describing surface complexity. The CNN consist of two layers; a deep convolutional layer which automatically extracts a set of reliable features from the input raw data and a conventional feedforward neural-based classification layer. To detect the missing items and the material types, overlapped input data are fed as inputs to the CNN as if the network "scan" the decorations to discriminate the type of their materials. The classification performance is tested on real-world destroyed byzantine frescoes of Saint Stephanus Monastery in Meteora.
During the last decade, documentation and three dimensional (3d) reconstruction of archaeological... more During the last decade, documentation and three dimensional (3d) reconstruction of archaeological sites and buildings have proven to be a valuable tool in terms of preservation and restoration processes. Moreover, 3d virtual models are used for the representation of cultural heritage assets, in a specific state of preservation at the time of a chosen period. In addition, diagnostic study of monuments with nondestructive testing methods is growing as common practice, for the assessment of their preservation state. A research study of the Acropolis of Erimokastro, an archaeological site in Rhodes Island, Greece, is presented, that concentrates on the use of various documentation methods and their integration for the assessment of the site’s preservation state. Initially, thorough historical documentation was performed. Geometric documentation was conducted using a drone and close range terrestrial photogrammetric processes. Infrared Thermography was applied in selected areas and more specifically in the exterior walls of the Acropolis, for the assessment the preservation state of the walls, for the detection of thermal conductivity of the building materials and decay patterns of the site. The goal of the study is to evaluate the preservation state of the Acropolis, through the integration of various multidisciplinary data including geometric, historical and building material information. Overall, the paper presents the employed 3d surveying techniques, the obtained 3d results and concludes in the documentation processes for analyzing ancient walls within a particular environment and the integration of infrared thermography on the remaining walls of the archaeological site for its sustainable rehabilitation in the future.
In this work, an approach regarding the representation of a monument in combination with building... more In this work, an approach regarding the representation of a monument in combination with building material documentation information (deriving from non-destructive techniques) is presented. Through this approach, data incorporating architectural, surveying and building material documentation information are aggregated with the 3D documentation model, leading to valuable information regarding the preservation state of a monument. The illustration of the Pythian Apollo ancient temple, located in the Ancient Acropolis of Rhodes, Greece, aims to highlight the manner in which the fusion of multilayered information can contribute to the diagnostic study of a monument, ultimately leading to its sustainable protection through time. Information deriving from the three dimensional documentation of the monument is enriched with information deriving from non-destructive techniques (Ground Penetrating Radar, Infrared Thermography, Digital Microscopy) in combination with historical and architectu...
This paper presents a holistic guiding methodology for the development of a geospatial tool to be... more This paper presents a holistic guiding methodology for the development of a geospatial tool to be used for the documentation, planning, smart management and dissemination of a country’s network of historic hiking trails. To deal with the challenges and to ensure the sustainability of a historic site, geospatial documentation merging authoritative and crowdsourced data and a WebGIS-based spatial analysis is necessary. Geospatial data collection should include professional field surveys, professional and crowdsourced photographic documentation and video recording of the existing historic walking/hiking trails. A geodatabase, structured using relational model technology, including vector spatial entities (feature classes), mosaics (raster) and tabulated data (geodatabase tables), should be developed on a commercial or open platform; in this case, the ArcGIS Pro is used. Entities with embedded descriptive information and metadata for the technical, legal, historical, and administrative ...
Technological development increases the value of a museum as a means for information disseminatio... more Technological development increases the value of a museum as a means for information dissemination by redefining its features as well as its new relationship with space and people. The creation of virtual reality systems and the development of a worldwide network society offer the museums the ability to promote their exhibits or their education material at a global audience at a relatively low cost. Great help can be offered by the new techniques in 3D geometric recording of objects-monuments of any size and the advanced spatial information management systems. In this paper the basic principles of a new concept regarding the 'space' of the museum is developed. In this concept a museum is examined as a building with its operational characteristics and also according to its information and activity: from the classical serial narration to the creation of different and multiple routes varying from the 'real' to the 'hybrid virtual' space where the real object and...
A technical tool to support projects for urban reforms and the implementation of current land pol... more A technical tool to support projects for urban reforms and the implementation of current land policies is presented together with an example for its application in a project concerning the preservation of privately-owned residential buildings listed as “protected” cultural heritage (CH) constructions, urban planning and planning for affordable housing provision. The projects should be based on the voluntary participation of current property owners and an agreement signed between them and the private developer (team of professionals), so that the project will be self-financed through value capture measures to be decided by the state. The application presented here is based on the assumption that the state, by example, has set the rules for an increase in FAR in order to apply affordable housing policy and the preservation of listed CH residential private constructions. The state also provides the rules for identifying the target group of beneficiaries for affordable housing. Current ...
Current archaeological research in Greece is greatly enhanced from urban construction development... more Current archaeological research in Greece is greatly enhanced from urban construction development that results in new archaeological finds. Whilst these findings are very important, financial pressures from during urban development result in either being destroyed or reburied to facilitate the construction of new structures. Invariably, valuable knowledge from such sites is lost forever. This paper discusses how modern surveying techniques can be used as foundation for preservation of cultural heritage. Specifically, the use of terrestrial laser scanning and digital photogrammetry to rapidly record detailed and definitive three-dimensional information from an early Helladic period (circa 2300BC) settlement in the southern area of Athens is discussed. The specific site has been exposed but will be completely destroyed due to a major road construction. The data capturing procedure during excavation is described and processing strategies are discussed. Finally, virtual models of the si...
The design of large –scale, integrated projects, developed within the principles of sustainable d... more The design of large –scale, integrated projects, developed within the principles of sustainable development, needs to ensure that special measures are incorporated in the project design, and operations management for the protection and preservation of natural environment. Parameters such as soils, landscape, water resources, habitat types flora and fauna are analytically examined during the initial project stages and the major conclusions on the existing environmental status provide the basis for selecting the site location, and developing the subsequent steps of the project design. Within this framework, the methodology developed for the protection of surface water streams and their ecology in a large-scale tourist project in Southern Greece is presented in this study. The wider area examined amounted to 3,000 ha, with the proposed buildings footprint corresponding to less than 1 % of this area. A multidisciplinary team of experts including photogrammetrists, hydrologists, environm...
https://doi.org/10.1145/3389189.3398000 Historic preservation of tangible cultural heritage asset... more https://doi.org/10.1145/3389189.3398000 Historic preservation of tangible cultural heritage assets is a process that goes beyond structural integrity to the restoration of the interior decorations, such as wall-paintings or icons since this provides a complete restoration process of the monuments that face both their architectural and functional elements. This process is imperative, as in a lot of cases parts of the assets (e.g., frescoes) are decayed or missing due to the passage of time and other environmental, natural or anthropogenic factors. An indicative paradigm of such a decay is the Byzantine churches in Meteora area, a UNESCO cultural heritage site in Greece. However, the limitations in taking samples from such sights indicate that before such fresco restoration process commences, we first need to semantically classify the monument surfaces into different material types, such as stone, mortar or frescoes. The research challenge imposes this semantic classification process is more evident in cases where the surfaces of the monument are not planar but complex, such as in many byzantine churches carved in rock in Meteora. In this paper, the semantic classification is achieved using a deep Convolutional Neural Network (CNN) which receives as input two types of data: RGB images of the frescoes to capture textural information and 3D cubes that encapsulate the geometric structure of the surface. RGB images describe visual complexity of the frescoes including texture maps and style. On the other hand, the 3D cubes include triangles of the surface, obtained using photogrammetric methods, describing surface complexity. The CNN consist of two layers; a deep convolutional layer which automatically extracts a set of reliable features from the input raw data and a conventional feedforward neural-based classification layer. To detect the missing items and the material types, overlapped input data are fed as inputs to the CNN as if the network "scan" the decorations to discriminate the type of their materials. The classification performance is tested on real-world destroyed byzantine frescoes of Saint Stephanus Monastery in Meteora.
During the last decade, documentation and three dimensional (3d) reconstruction of archaeological... more During the last decade, documentation and three dimensional (3d) reconstruction of archaeological sites and buildings have proven to be a valuable tool in terms of preservation and restoration processes. Moreover, 3d virtual models are used for the representation of cultural heritage assets, in a specific state of preservation at the time of a chosen period. In addition, diagnostic study of monuments with nondestructive testing methods is growing as common practice, for the assessment of their preservation state. A research study of the Acropolis of Erimokastro, an archaeological site in Rhodes Island, Greece, is presented, that concentrates on the use of various documentation methods and their integration for the assessment of the site’s preservation state. Initially, thorough historical documentation was performed. Geometric documentation was conducted using a drone and close range terrestrial photogrammetric processes. Infrared Thermography was applied in selected areas and more specifically in the exterior walls of the Acropolis, for the assessment the preservation state of the walls, for the detection of thermal conductivity of the building materials and decay patterns of the site. The goal of the study is to evaluate the preservation state of the Acropolis, through the integration of various multidisciplinary data including geometric, historical and building material information. Overall, the paper presents the employed 3d surveying techniques, the obtained 3d results and concludes in the documentation processes for analyzing ancient walls within a particular environment and the integration of infrared thermography on the remaining walls of the archaeological site for its sustainable rehabilitation in the future.
In this work, an approach regarding the representation of a monument in combination with building... more In this work, an approach regarding the representation of a monument in combination with building material documentation information (deriving from non-destructive techniques) is presented. Through this approach, data incorporating architectural, surveying and building material documentation information are aggregated with the 3D documentation model, leading to valuable information regarding the preservation state of a monument. The illustration of the Pythian Apollo ancient temple, located in the Ancient Acropolis of Rhodes, Greece, aims to highlight the manner in which the fusion of multilayered information can contribute to the diagnostic study of a monument, ultimately leading to its sustainable protection through time. Information deriving from the three dimensional documentation of the monument is enriched with information deriving from non-destructive techniques (Ground Penetrating Radar, Infrared Thermography, Digital Microscopy) in combination with historical and architectu...
This paper presents a holistic guiding methodology for the development of a geospatial tool to be... more This paper presents a holistic guiding methodology for the development of a geospatial tool to be used for the documentation, planning, smart management and dissemination of a country’s network of historic hiking trails. To deal with the challenges and to ensure the sustainability of a historic site, geospatial documentation merging authoritative and crowdsourced data and a WebGIS-based spatial analysis is necessary. Geospatial data collection should include professional field surveys, professional and crowdsourced photographic documentation and video recording of the existing historic walking/hiking trails. A geodatabase, structured using relational model technology, including vector spatial entities (feature classes), mosaics (raster) and tabulated data (geodatabase tables), should be developed on a commercial or open platform; in this case, the ArcGIS Pro is used. Entities with embedded descriptive information and metadata for the technical, legal, historical, and administrative ...
Technological development increases the value of a museum as a means for information disseminatio... more Technological development increases the value of a museum as a means for information dissemination by redefining its features as well as its new relationship with space and people. The creation of virtual reality systems and the development of a worldwide network society offer the museums the ability to promote their exhibits or their education material at a global audience at a relatively low cost. Great help can be offered by the new techniques in 3D geometric recording of objects-monuments of any size and the advanced spatial information management systems. In this paper the basic principles of a new concept regarding the 'space' of the museum is developed. In this concept a museum is examined as a building with its operational characteristics and also according to its information and activity: from the classical serial narration to the creation of different and multiple routes varying from the 'real' to the 'hybrid virtual' space where the real object and...
A technical tool to support projects for urban reforms and the implementation of current land pol... more A technical tool to support projects for urban reforms and the implementation of current land policies is presented together with an example for its application in a project concerning the preservation of privately-owned residential buildings listed as “protected” cultural heritage (CH) constructions, urban planning and planning for affordable housing provision. The projects should be based on the voluntary participation of current property owners and an agreement signed between them and the private developer (team of professionals), so that the project will be self-financed through value capture measures to be decided by the state. The application presented here is based on the assumption that the state, by example, has set the rules for an increase in FAR in order to apply affordable housing policy and the preservation of listed CH residential private constructions. The state also provides the rules for identifying the target group of beneficiaries for affordable housing. Current ...
Current archaeological research in Greece is greatly enhanced from urban construction development... more Current archaeological research in Greece is greatly enhanced from urban construction development that results in new archaeological finds. Whilst these findings are very important, financial pressures from during urban development result in either being destroyed or reburied to facilitate the construction of new structures. Invariably, valuable knowledge from such sites is lost forever. This paper discusses how modern surveying techniques can be used as foundation for preservation of cultural heritage. Specifically, the use of terrestrial laser scanning and digital photogrammetry to rapidly record detailed and definitive three-dimensional information from an early Helladic period (circa 2300BC) settlement in the southern area of Athens is discussed. The specific site has been exposed but will be completely destroyed due to a major road construction. The data capturing procedure during excavation is described and processing strategies are discussed. Finally, virtual models of the si...
The design of large –scale, integrated projects, developed within the principles of sustainable d... more The design of large –scale, integrated projects, developed within the principles of sustainable development, needs to ensure that special measures are incorporated in the project design, and operations management for the protection and preservation of natural environment. Parameters such as soils, landscape, water resources, habitat types flora and fauna are analytically examined during the initial project stages and the major conclusions on the existing environmental status provide the basis for selecting the site location, and developing the subsequent steps of the project design. Within this framework, the methodology developed for the protection of surface water streams and their ecology in a large-scale tourist project in Southern Greece is presented in this study. The wider area examined amounted to 3,000 ha, with the proposed buildings footprint corresponding to less than 1 % of this area. A multidisciplinary team of experts including photogrammetrists, hydrologists, environm...
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