منابع مشابه
A New Spatial Framework for Digital Earth: Sphere Shell Space 3D Grid
Discrete Global Grid data model has been widely used in digital earth. But it is only confined to the surface, and then it can not reach to the inside and outside of the earth surface. The Sphere Shell Space 3D Grid (SSSG) proposed here sets up a new spatial reference framework for the whole earth 3D space. The subdivision and coding model of SSSG is designed and carried out, which is called as...
متن کاملVoronoi Grid-Shell Structures
We introduce a framework for the generation of grid-shell structures that is based on Voronoi diagrams and allows us to design tessellations that achieve excellent static performances. We start from an analysis of stress on the input surface and we use the resulting tensor field to induce an anisotropic non-Euclidean metric over it. Then we compute a Centroidal Voronoi Tessellation under the sa...
متن کامل3D Model Retrieval Based on Grid Sphere and Dodecahedral Silhouette Descriptors
With the development of computer graphics and virtual realities, the demand for a content-based 3D model retrieval system becomes urgent. In this study, two features, grid sphere and dodecahedral silhouettes, are proposed and combined for 3D model retrieval. The experiments are conducted on a 3D model database. Experiment results show that the proposed methods are superior to others.
متن کاملDesign and Manipulation 3D Imaging System by using Photodiode Grid
Introduction: Radiation imaging is one of the applicable methods in diagnostic medicine and nondestructive testing for industrial applications. In nondestructive 3D imaging, in addition to the radiation source, there is a requirement for a suitable detection system, data acquisition system, mechanical sections for moving objects, reconstruction algorithm and finally a computer for processing an...
متن کاملSphere packings in 3-space
In this paper we survey results on packings of congruent spheres in 3-dimensional spaces of constant curvature. The topics discussed are as follows: Hadwiger numbers of convex bodies and kissing numbers of spheres; Touching numbers of convex bodies; Newton numbers of convex bodies; One-sided Hadwiger and kissing numbers; Contact graphs of finite packings and the combinatorial Kepler problem; Is...
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ژورنال
عنوان ژورنال: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
سال: 2013
ISSN: 2194-9034
DOI: 10.5194/isprsarchives-xl-4-w2-77-2013