Results 1 to 10 of about 5,186,590 (262)
Mapping of Population Density [PDF]
Demography, 1974 Abstract The Bureau of the Census listing of geographical coordinates of centroids of all enumeration districts together with population counts from the U. S. 1970 Census of Population was used to contruct via computer five nationwide geographical grids of population density with sector dimensions of 0.01, 0.02, 0.04, 0.1, and 0.25 ...
C M, Haaland, M T, Heath
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Regular Maps of High Density [PDF]
Discrete & Computational Geometry, 2017 A regular map is a surface together with an embedded graph, having properties similar to those of the surface and graph of a platonic solid. We analyze regular maps with reflection symmetry and a graph of density strictly exceeding 1/2, and we conclude that all regular maps of this type belong to a family of maps naturally defined on the Fermat curves ...
Rob H. Eggermont, Maximiliaan Hendriks
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IEEE Access, 2023 Spatiotemporal data visualization is of paramount importance in several applications, especially for analyzing urban mobility data encoded on topologies. This paper introduces a novel solution, called Temporal Topology Density Map (TTDM), to represent 2D discrete spatial data with temporal variations into a 2D continuous spatial space constrained by a ...
Zhicheng Hu +4 more
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Invariant densities for noisy maps [PDF]
Physical Review A, 1991 The invariant density of discrete dynamical systems in the presence of weak Gaussian noise is studied both by means of path integrals and a WKB method. The leading order of the invariant density in the noise strength defines a generalized potential that is a Lyapunov function of the deterministic map.
Reimann, P., Talkner, P.
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Functional connectivity density mapping [PDF]
Proceedings of the National Academy of Sciences, 2010 Brain networks with energy-efficient hubs might support the high cognitive performance of humans and a better understanding of their organization is likely of relevance for studying not only brain development and plasticity but also neuropsychiatric disorders.
Dardo, Tomasi, Nora D, Volkow
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Comparative Study of Fixation Density Maps [PDF]
IEEE Transactions on Image Processing, 2013 Fixation density maps (FDM) created from eye tracking experiments are widely used in image processing applications. The FDM are assumed to be reliable ground truths of human visual attention and as such, one expects a high similarity between FDM created in different laboratories.
Ulrich Engelke +6 more
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Metric Density and Quasimobius Mappings [PDF]
Siberian Mathematical Journal, 2002 Summary: We study the notion of \(\mu\)-density of metric spaces which was introduced by V.~V.~Aseev and D.~A.~Trotsenko. An interrelation between the \(\mu\)-density and homogeneous density is established. We also characterize \(\mu\)-dense spaces as ``arcwise'' connected metric spaces in which ``arcs'' are the quasimöbius images of the middle-third ...
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Composite Density Maps for Multivariate Trajectories [PDF]
IEEE Transactions on Visualization and Computer Graphics, 2011 We consider moving objects as multivariate time-series. By visually analyzing the attributes, patterns may appear that explain why certain movements have occurred. Density maps as proposed by Scheepens et al. [25] are a way to reveal these patterns by means of aggregations of filtered subsets of trajectories. Since filtering is often not sufficient for
Roeland Scheepens +5 more
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Entourages, Density, Cauchy Maps, and Completion [PDF]
Applied Categorical Structures, 2018 zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Jorge Picado, Ales Pultr
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Simplification of three-dimensional density maps [PDF]
IEEE Transactions on Visualization and Computer Graphics, 2004 We consider scientific data sets that describe density functions over three-dimensional geometric domains. Such data sets are often large and coarsened representations are needed for visualization and analysis. Assuming a tetrahedral mesh representation, we construct such representations with a simplification algorithm that combines three goals: the ...
Natarajan, Vijay, Edelsbrunner, Herbert
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