TY - JOUR A1 - Paredes, E. G. A1 - Boo, M. A1 - Amor, M. A1 - Bruguera, J. D. A1 - Döllner, Jürgen Roland Friedrich T1 - Extended hybrid meshing algorithm for multiresolution terrain models JF - International journal of geographical information science N2 - Hybrid terrains are a convenient approach for the representation of digital terrain models, integrating heterogeneous data from different sources. In this article, we present a general, efficient scheme for achieving interactive level-of-detail rendering of hybrid terrain models, without the need for a costly preprocessing or resampling of the original data. The presented method works with hybrid digital terrains combining regular grid data and local high-resolution triangulated irregular networks. Since grid and triangulated irregular network data may belong to different datasets, a straightforward combination of both geometries would lead to meshes with holes and overlapping triangles. Our method generates a single multiresolution model integrating the different parts in a coherent way, by performing an adaptive tessellation of the region between their boundaries. Hence, our solution is one of the few existing approaches for integrating different multiresolution algorithms within the same terrain model, achieving a simple interactive rendering of complex hybrid terrains. KW - 3D modeling KW - 3D visualization KW - geovisualization KW - triangulated irregular networks Y1 - 2012 U6 - https://doi.org/10.1080/13658816.2011.615317 SN - 1365-8816 VL - 26 IS - 5 SP - 771 EP - 793 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - JOUR A1 - Koyan, Philipp A1 - Tronicke, Jens T1 - 3D modeling of ground-penetrating radar data across a realistic sedimentary model JF - Computers & geosciences : an international journal devoted to the publication of papers on all aspects of geocomputation and to the distribution of computer programs and test data sets ; an official journal of the International Association for Mathematical Geology N2 - Ground-penetrating radar (GPR) is an established geophysical tool to explore a wide range of near-surface environments. Today, the use of synthetic GPR data is largely limited to 2D because 3D modeling is computationally more expensive. In fact, only recent developments of modeling tools and powerful hardware allow for a time-efficient computation of extensive 3D data sets. Thus, 3D subsurface models and resulting GPR data sets, which are of great interest to develop and evaluate novel approaches in data analysis and interpretation, have not been made publicly available up to now.
We use a published hydrofacies data set of an aquifer-analog study within fluvio-glacial deposits to infer a realistic 3D porosity model showing heterogeneities at multiple spatial scales. Assuming fresh-water saturated sediments, we generate synthetic 3D GPR data across this model using novel GPU-acceleration included in the open-source software gprMax. We present a numerical approach to examine 3D wave-propagation effects in modeled GPR data. Using the results of this examination study, we conduct a spatial model decomposition to enable a computationally efficient 3D simulation of a typical GPR reflection data set across the entire model surface. We process the resulting GPR data set using a standard 3D structural imaging sequence and compare the results to selected input data to demonstrate the feasibility and potential of the presented modeling studies. We conclude on conceivable applications of our 3D GPR reflection data set and the underlying porosity model, which are both publicly available and, thus, can support future methodological developments in GPR and other near-surface geophysical techniques. KW - Applied geophysics KW - Ground-penetrating radar KW - 3D modeling Y1 - 2020 U6 - https://doi.org/10.1016/j.cageo.2020.104422 SN - 0098-3004 SN - 1873-7803 VL - 137 PB - Elsevier CY - Amsterdam ER - TY - THES A1 - Rehse, Jessica T1 - 3D-Druck und 3D-Modellierung im Wirtschaft-Arbeit-Technik-Unterricht T1 - 3D printing and 3D modeling in economy-work-technology lessons N2 - Die Technologie des 3D-Drucks hat sich in den letzten Jahrzehnten rasant entwickelt. Im Industriebereich entstehen immer modernere und spezialisiertere Druckverfahren, im Hobby- und Privatanwenderbereich hingegen werden stetig kostengünstigere und einfacher zu bedienende Geräte zugänglich. Einzig im Bildungsbereich scheint das Themenfeld hingegen erst langsam eine Rolle zu spielen, obwohl sich zahlreiche Bezugspunkte für einen Einsatz in verschiedensten Fächern finden lassen. Insbesondere im Fach Wirtschaft-Arbeit-Technik sind die Schnittstellen zum Rahmenlehrplan Berlin/Brandenburg augenscheinlich, doch es liegen erst vereinzelt konkrete und systematische didaktische Konzepte und Vorschläge zur unterrichtspraktischen Einbettung vor. Die Verfasserin versucht daher in dieser Arbeit die Relevanz des Themas für die technische Bildung deutlich zu machen, eine kurze technische Einführung in das für einen schulischen Einsatz besonders geeignete FDM-Druckverfahren zu geben und daran anknüpfend konkrete Umsetzungsvorschläge aufzuzeigen: einerseits in Form eines allgemeinen Phasenmodells zur Planung von Technikunterricht sowie andererseits in Form eines exemplarischen Unterrichtskonzepts. Am Beispiel eines Schachsets wird verdeutlicht, wie Schülerinnen und Schüler zum Anfertigen der Konstruktionsunterlagen digitale CAD-Programme nutzen und anschließend mit Hilfe eines 3D-Druckers additiv fertigen können. N2 - While 3D printing technology is now becoming increasingly widespread in both industry and the private sector, it has so far rarely been used in educational processes. Things are going way slower here, even though there are many school subjects which would perfectly fit for it. The intersections to the Berlin/Brandenburg framework curriculum are particularly obvious in the subject of economy-work-technology. However, there are only a few concrete and systematic didactic concepts and suggestions for the practical embedding in lessons. The author therefore attempts in this paper to make clear the relevance of the topic for technical education and to give a brief technical introduction to the FDM printing process, which is particularly suitable for use in schools. Following on from this, she attempts to show concrete suggestions for implementation: on the one hand, in the form of a general phase model for planning technology lessons and, on the other, in the form of an exemplary teaching concept. The example of a chess set is used to illustrate how students can use digital CAD programs to create the designs and then manufacture them additively with the aid of a 3D printer. KW - 3D-Druck KW - FDM-Druck KW - 3D-Modellierung KW - 3D-Konstruktion KW - CAD KW - Digitale Bildung KW - Technische Bildung KW - WAT KW - Wirtschaft-Arbeit-Technik KW - Technikdidaktik KW - Konstruktionsaufgabe KW - Unterrichtskonzept KW - 3D printing KW - FDM printing KW - 3D modeling KW - 3D design KW - CAD KW - digital education KW - technical education KW - WAT KW - economy-work-technology KW - technology didactics KW - design task KW - teaching concept Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-524485 ER -