Conference Presentations by Christopher Dostal
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The biggest technological improvement to archaeological documentation techniques in recent years ... more The biggest technological improvement to archaeological documentation techniques in recent years has been the implementation of various 3D digitization technologies, such as Computer Vision Photogrammetry and 3D laser scanning. Laser scanning produces the most accurate geometrical data available today, but it lacks the ability to accurately capture textures and diagnostic coloration information. Photogrammetric data produces highly accurate photographic textures, but the geometric data tends to be less accurate than the laser scanned data.
In this paper, the authors present a new methodology that combine advantages of laser scanner and Computer Vision Photogrammetry; applying photorealistic photogrammetry textures on geometry of laser scanned 3-D digital models. This methodology allows archaeologists to have a 3-D digital model that possesses laser scan quality geometry with photorealistic textures. Furthermore, archaeologist can apply this methodology to various laser scan dataset which is from artifacts captured by FaroArm to landscapes captured by a multi-beam sonar.
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Talks by Christopher Dostal
Due to the nature of the degradation that occurs to water-logged cultural heritage materials, it ... more Due to the nature of the degradation that occurs to water-logged cultural heritage materials, it is an essential responsibility of archaeologists to take the appropriate conservation measures to stabilize and preserve artifacts for future generations to study. Excavation without a fully realized plan for conservation is tantamount to historical vandalism. This paper is divided into three main parts. First is an overview of the natural processes of degradation that occurs to cultural heritage material that is left underwater. Different materials degrade at different rates, and often similar materials can behave very differently with only slight changes to the environment in which they exist, and this must be accounted for when intervening in the natural equilibrium the site has reached. The second part of this paper is a summary of several of the treatment options available for a variety of materials, including ceramics and glass, organic material like waterlogged archaeological wood, leather, and bone, as well as encrusted iron artifacts, encrusted natural molds, and other metals like copper and lead. Along with the types of treatments possible, this section also addresses the necessary equipment for each treatment, associated time requirements, the necessary expertise of personnel, and the associated costs of chemicals and other materials. The third part of this paper is dedicated to the discussion of the ethical problems commonly encountered by archaeological conservation laboratories, with a specific focus on the problems associated with using academic or government conservation facilities to conserve cultural heritage materials acquired by looters, vandals, thieves, and treasure hunters.
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Teaching Documents by Christopher Dostal
A guest lecture introduction to the fundamentals of freeze drying for water logged archaeological... more A guest lecture introduction to the fundamentals of freeze drying for water logged archaeological wood.
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Papers by Christopher Dostal
Society for Historical Archaeology, 2019
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Society for Historical Archaeology, 2016
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Society for Historical Archaeology, 2017
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Society for Historical Archaeology, 2014
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Society for Historical Archaeology, 2015
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Archéologiques
Gaspé's abundant maritime subsistence resources such as whales and cod drew European fish... more Gaspé's abundant maritime subsistence resources such as whales and cod drew European fishermen for centuries. Exploiting these rich fishing resources required vessels that were well-suited to the challenging geography. These challenges pushed shipwrights to develop new nautical technologies which were implemented in the ships' construction. The Gaspé Maritime Archaeology Project (GMAP) seeks to study these developing technologies through the archaeological ship remnants in the waters around Gaspé. The 2022 field season pursued this research through a remote-sensing survey of Gaspé Bay and Malbay and by studying a shipwreck on a beach in Cap-des-Rosiers believed to be a 19th-century oceangoing ship. • Les abondantes ressources de subsistance maritimes de la Gaspésie telles que les baleines et la morue ont attiré les pêcheurs européens pendant des siècles. L'exploitation de ces riches ressources halieutiques nécessitait des navires bien adaptés à la géographie difficile du golfe du Saint-Laurent. Ces défis ont poussé les constructeurs navals à développer de nouvelles technologies nautiques qui ont été mises en oeuvre dans la construction des navires. Le projet d'archéologie maritime de Gaspé (GMAP) vise à étudier ces technologies en développement à travers les vestiges archéologiques de navires dans les eaux autour de Gaspé. La saison de fouilles 2022 a poursuivi ces recherches par un relevé par télédétection de la baie de Gaspé et de Malbay et par l'étude d'un naufrage sur une plage de Cap-des-Rosiers qui serait un navire océanique du xix e siècle.
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This study utilized portable X-Ray fluorescence to analyze pigment patterns in 33 paintings by Ju... more This study utilized portable X-Ray fluorescence to analyze pigment patterns in 33 paintings by Julian Onderdonk, a 19th-20th century Texas impressionist. This analysis led to the identification of distinctive pigment preferences for Onderdonk at different periods of his career. Using the pigment preference patterns identified in the paintings that were dated by the artist, undated works were analyzed and assigned to different periods in the artists career based on their pigment patterns. This study represents a non-destructive method for organizing the artist’s work without solely relying on stylistic changes.
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Society for Historical Archaeology, 2017
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Society for Historical Archaeology, 2016
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Society for Historical Archaeology, 2017
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Visual Computing for Cultural Heritage, 2020
Archaeologists reconstruct past human activity from material culture remains. Recording, represen... more Archaeologists reconstruct past human activity from material culture remains. Recording, representing and reconstructing artifacts or contexts is a long, morose, and often expensive process. Computers have radically changed traditional methodologies and are creating opportunities to develop more eloquent images or graphic files that convey compressed information and engage the public in a more participative way. Archeological reconstructions are thinking tools that allow us to reason better and faster about our past and present, and computer graphics can replace the traditional long texts and orthographic images with a rich learning environment that transforms the learning experience into an active and critical mental process. This chapter analyses the current methodologies and evaluates the cost-benefits of the best off-the-shelf software packages and their potential to improve the recording, representing, reconstructing, and sharing archaeological contexts and artifacts.
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Conference Presentations by Christopher Dostal
In this paper, the authors present a new methodology that combine advantages of laser scanner and Computer Vision Photogrammetry; applying photorealistic photogrammetry textures on geometry of laser scanned 3-D digital models. This methodology allows archaeologists to have a 3-D digital model that possesses laser scan quality geometry with photorealistic textures. Furthermore, archaeologist can apply this methodology to various laser scan dataset which is from artifacts captured by FaroArm to landscapes captured by a multi-beam sonar.
Talks by Christopher Dostal
Teaching Documents by Christopher Dostal
Papers by Christopher Dostal
In this paper, the authors present a new methodology that combine advantages of laser scanner and Computer Vision Photogrammetry; applying photorealistic photogrammetry textures on geometry of laser scanned 3-D digital models. This methodology allows archaeologists to have a 3-D digital model that possesses laser scan quality geometry with photorealistic textures. Furthermore, archaeologist can apply this methodology to various laser scan dataset which is from artifacts captured by FaroArm to landscapes captured by a multi-beam sonar.
Madeiras e artefactos provinham indubitavelmente de uma mesma origem: um local de naufrágio ainda desconhecido mas certamente situado ou ao largo daquela praia ou nas suas imediações.
Como a natureza rochosa do fundo, a frequência da agitação marítima e a fraca visibilidade dificultavam a localização do suspeitado destroço, a salvaguarda do sítio limitou-se ao acautelamento das peças arrojadas, tarefa levada a cabo pelas arqueólogas da Divisão de Acção Cultural da Câmara Municipal de Esposende (CME), com o apoio total da autarquia.
Entre 2015 e 2017, sucessivas tempestades levaram a novos arrojamentos. Muitos deles ocorreram a desoras, sem a supervisão dos técnicos da CME ou dos achadores originais, concorrendo para a delapidação dos bens arqueológicos, quer sob efeito do mau tempo, quer efectivamente desaparecendo por serem levados por outros utentes da orla marítima.