Results 11 to 20 of about 28,807 (292)
International Journal of Digital Earth, 2022 Although research on the discrete global grid systems (DGGSs) has become an essential issue in the era of big earth data, there is still a gap between the efficiency of current encoding and operation schemes for hexagonal DGGSs and the needs of practical
Long Zhao +4 more
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Tree Drawings on the Hexagonal Grid [PDF]
, 2009 We consider straight-line drawings of trees on a hexagonal grid. The hexagonal grid is an extension of the common grid with inner nodes of degree six. We restrict the number of directions used for the edges from each node to its children from one to five, and to five patterns: straight, Y, ψ, X, and full.
Christian Bachmaier +5 more
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Balanced binary arrays iii: the hexagonal grid [PDF]
Journal of the Australian Mathematical Society, 1979 AbstractWe consider the following problem arising in agricultural statistics. Suppose that a large number of plants are set out on a regular grid, which may be triangular, square or hexagonal, and that among these plants, half are to be given one and half the other of two possible treatments.
Oates-Williams, Sheila +1 more
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Honeycomb Geometry: Rigid Motions on the Hexagonal Grid [PDF]
, 2017 Euclidean rotations in $\mathbb{R}^2$ are bijective and isometric maps, but they lose generally these properties when digitized in discrete spaces. In particular, the topological and geometrical defects of digitized rigid motions on the square grid have been studied. In this context, the main problem is related to the incompatibility between the square
Pluta, Kacper +3 more
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THE TRANSFORM BETWEEN GEOGRAPHIC COORDINATES AND LOCATION CODES OF APERTURE 4 HEXAGONAL GRID SYSTEM [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2017 Discrete global grid system is a new data model which supports the fusion processing of multi-source geospatial data. In discrete global grid systems, all cell operations can be completed by codes theoretically, but most of current spatial data are in ...
R. Wang, J. Ben, J. Ben, Y. Li, L. Du
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Indexing Mixed Aperture Icosahedral Hexagonal Discrete Global Grid Systems
ISPRS International Journal of Geo-Information, 2020 Discrete global grid systems (DGGSs) are an emerging multiresolution 3D model used to integrate and analyze big earth data. The characteristic of multiresolution is usually realized by hierarchically subdividing cells on the sphere using certain ...
Rui Wang +3 more
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IMPROPER COLORING OF WEIGHTED GRID AND HEXAGONAL GRAPHS [PDF]
Discrete Mathematics, Algorithms and Applications, 2010 We study a weighted improper coloring problem motivated by a frequency allocation problem. It consists of associating to each vertex a set of p(v) (weight) distinct colors (frequencies), such that the set of vertices having a given color induces a graph of degree at most k (the case k = 0 corresponds to proper coloring).
Bermond, Jean-Claude +3 more
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Characterization of Bijective Digitized Rotations on the Hexagonal Grid [PDF]
Journal of Mathematical Imaging and Vision, 2018 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Pluta, Kacper +5 more
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Accuracy Evaluation Method for Vector Data Based on Hexagonal Discrete Global Grid
ISPRS International Journal of Geo-InformationWith the continuous advancement of technology for obtaining geographic spatial data, the accumulated volume of such data has been increasing, thus imposing higher demands on the storage, organization, and management of such data.
Yue Ma +3 more
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An Occupancy Information Grid Model for Path Planning of Intelligent Robots
ISPRS International Journal of Geo-Information, 2022 Commonly used robot map models include occupancy grid maps, topological maps, and semantic maps. Among these, an occupancy grid map is mainly represented as a quadrilateral grid. This paper proposes an occupancy information grid for intelligent robots by
Jinming Zhang +3 more
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