The Experts below are selected from a list of 741 Experts worldwide ranked by ideXlab platform
Amber M. Vanderwarker - One of the best experts on this subject based on the ideXlab platform.
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Geophysical Investigations at Teotepec, Mexico (1000 B.C.–A.D. 1000)
Journal of Field Archaeology, 2009Co-Authors: Victor D. Thompson, Philip J. Arnold, Amber M. VanderwarkerAbstract:AbstractRecent investigations at the site of Teotepec in the Sierra de los Tuxtlas in southern Veracruz, Mexico explored Middle Formative through Late Classic (1000 B.C.–A.D. 1000) socioeconomic conditions. A central focus was the form and function of the site's distinctive architectural configuration, the Long Plaza Group. During the 2007 and 2008 field seasons, a systematic geophysical survey of Teotepec obtained initial information on the layout, orientation, and possible function of the site's central architectural core. Results from the survey allow for a clear definition of the site's Long Plaza Group in addition to the identification of a possible ball court along its eastern edge. It is also clear that Teotepecans incorporated natural features into their architectural core by placing a pyramid atop a Volcanic Landform and modifying a natural basalt flow in order to create a level plaza. Finally, the geophysical data indicate significant time depth in architectural construction by suggesting diffir...
Jean-claude Thouret - One of the best experts on this subject based on the ideXlab platform.
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Volcanic geomorphology—an overview
Earth-Science Reviews, 1999Co-Authors: Jean-claude ThouretAbstract:Abstract The review examines the role of geomorphology in analyzing the volcanoes on Earth. Five objectives are stressed. First, classifications of Volcanic Landforms should be improved to take care of the complexity in Volcanic Landform generation as magmatic systems, style of eruption, and the erupted material all influence the morphology. Second, geomorphology should contribute to the science of volcanology through its capability in reconstructing growth `stages' in complex volcanoes, and also in analyzing the structural factors which contribute to the catastrophic collapse of volcanoes. Third, geomorphology can contribute to physical volcanology by assessing the effects of topography on transport, erosion, and deposition of volcanogenic flows and identifying the sources and climatic/tectonic conditions which govern the emplacement of Volcaniclastic deposits. Fourth, Volcanic geomorphology (a) identifies sedimentary facies associations, (b) constructs facies models for dynamic volcano delivery systems, and (c) analyzes the characteristics of sediment gravity flows in order to determine relevant parameters for modelling their behaviour. Fifth, process-oriented geomorphology is critical in developing accurate methods for measuring rates of geomorphic processes that shape ephemeral Volcanic constructs, and for evaluating and comparing geomorphic impacts on disturbed catchments and the related hydrologic response before, during, and after eruptions. This should help to refine parameters for the exponential decay model. Finally, Volcanic geomorphology is essential for risk assessment through geomorphic hazard zonation and composite risk zonation. Such treatments are necessary in order to face the enhanced challenge posed by the combination of natural hazards and the increasing number of people who are at risk around volcanoes.
Victor D. Thompson - One of the best experts on this subject based on the ideXlab platform.
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Geophysical Investigations at Teotepec, Mexico (1000 B.C.–A.D. 1000)
Journal of Field Archaeology, 2009Co-Authors: Victor D. Thompson, Philip J. Arnold, Amber M. VanderwarkerAbstract:AbstractRecent investigations at the site of Teotepec in the Sierra de los Tuxtlas in southern Veracruz, Mexico explored Middle Formative through Late Classic (1000 B.C.–A.D. 1000) socioeconomic conditions. A central focus was the form and function of the site's distinctive architectural configuration, the Long Plaza Group. During the 2007 and 2008 field seasons, a systematic geophysical survey of Teotepec obtained initial information on the layout, orientation, and possible function of the site's central architectural core. Results from the survey allow for a clear definition of the site's Long Plaza Group in addition to the identification of a possible ball court along its eastern edge. It is also clear that Teotepecans incorporated natural features into their architectural core by placing a pyramid atop a Volcanic Landform and modifying a natural basalt flow in order to create a level plaza. Finally, the geophysical data indicate significant time depth in architectural construction by suggesting diffir...
Luca Nannipieri - One of the best experts on this subject based on the ideXlab platform.
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Surface fitting in geomorphology - examples for regular-shaped Volcanic Landforms
Geomorphology, 2014Co-Authors: Massimiliano Favalli, Dávid Karátson, Jorge Yepes, Luca NannipieriAbstract:Abstract In nature, several types of Landforms have simple shapes: as they evolve they tend to take on an ideal, simple geometric form such as a cone, an ellipsoid or a paraboloid. Volcanic Landforms are possibly the best examples of this “ideal” geometry, since they develop as regular surface features due to the point-like (circular) or fissure-like (linear) manifestation of Volcanic activity. In this paper, we present a geomorphometric method of fitting the “ideal” surface onto the real surface of regular-shaped volcanoes through a number of case studies (Mt. Mayon, Mt. Somma, Mt. Semeru, and Mt. Cameroon). Volcanoes with circular, as well as elliptical, symmetry are addressed. For the best surface fit, we use the minimization library MINUIT which is made freely available by the CERN (European Organization for Nuclear Research). This library enables us to handle all the available surface data (every point of the digital elevation model) in a one-step, half-automated way regardless of the size of the dataset, and to consider simultaneously all the relevant parameters of the selected problem, such as the position of the center of the edifice, apex height, and cone slope, thanks to the highly performing adopted procedure. Fitting the geometric surface, along with calculating the related error, demonstrates the twofold advantage of the method. Firstly, we can determine quantitatively to what extent a given Volcanic Landform is regular, i.e. how much it follows an expected regular shape. Deviations from the ideal shape due to degradation (e.g. sector collapse and normal erosion) can be used in erosion rate calculations. Secondly, if we have a degraded Volcanic Landform, whose geometry is not clear, this method of surface fitting reconstructs the original shape with the maximum precision. Obviously, in addition to Volcanic Landforms, this method is also capable of constraining the shapes of other regular surface features such as aeolian, glacial or periglacial Landforms.
X. Wang - One of the best experts on this subject based on the ideXlab platform.
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INFORMATION EXTRACTION OF TOURIST GEOLOGICAL RESOURCES BASED ON 3D VISUALIZATION REMOTE SENSING IMAGE
ISPRS - International Archives of the Photogrammetry Remote Sensing and Spatial Information Sciences, 2018Co-Authors: X. WangAbstract:Abstract. Tourism geological resources are of high value in admiration, scientific research and universal education, which need to be protected and rationally utilized. In the past, most of the remote sensing investigations of tourism geological resources used two-dimensional remote sensing interpretation method, which made it difficult for some geological heritages to be interpreted and led to the omission of some information. This aim of this paper is to assess the value of a method using the three-dimensional visual remote sensing image to extract information of geological heritages. skyline software system is applied to fuse the 0.36 m aerial images and 5m interval DEM to establish the digital earth model. Based on the three-dimensional shape, color tone, shadow, texture and other image features, the distribution of tourism geological resources in Shandong Province and the location of geological heritage sites were obtained, such as geological structure, DaiGu Landform, granite Landform, Volcanic Landform, sandy Landform, Waterscapes, etc. The results show that using this method for remote sensing interpretation is highly recognizable, making the interpretation more accurate and comprehensive.
