Results 21 to 30 of about 28,807 (292)
THE COMPARISON OF DRAINAGE NETWORK EXTRACTION BETWEEN SQUARE AND HEXAGONAL GRID-BASED DEM [PDF]
The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2018 The automatic extraction of valleys or ridges from DEM is a long term topic in the GIS and hydrology fields and a number of algorithms have been developed.
L. Wang, T. Ai
doaj +1 more source
Research and Construction of a Global Hexagonal Marine Gravity Gradient Reference Map for Navigation
Geofluids, 2023 A high-precision marine gravity gradient reference map is key to enabling underwater gravity gradient matching navigation. At present, the construction of the reference maps is based on quadrilateral geographic grids. However, quadrilateral grids lead to
Huang Yan +7 more
doaj +1 more source
Extraction of ocean tidal information based on global equal-area grid and satellite altimeter data
International Journal of Digital Earth, 2022 Harmonic analysis of satellite altimetry data based on a global regular grid is affected by the grid spatial tessellation and placement of the grids.
Wenbo Wang +4 more
doaj +1 more source
Hexagonal Convolutional Neural Networks for Hexagonal Grids [PDF]
IEEE Access, 2019 Hexagonal grids use a hierarchical subdivision tessellation to cover the entire plane or sphere. Due to the 6-fold rotational symmetry, hexagonal grids have some advantages (e.g. isoperimetry, equidistant neighbors, and uniform connectivity) over quadrangular and triangular girds, which makes them suitable to tackle tasks of geospatial information ...
Junren Luo +3 more
openaire +2 more sources
ISPRS International Journal of Geo-Information, 2021 With the rapid development of earth observation, satellite navigation, mobile communication, and other technologies, the order of magnitude of the spatial data we acquire and accumulate is increasing, and higher requirements are put forward for the ...
Yue Ma +6 more
doaj +1 more source
Halftoning over a hexagonal grid [PDF]
SPIE Proceedings, 2003 In this contribution, we present an optimal halftoning algorithm that uniformly distributes pixels over a hexagonal grid. This method is based on a slightly modified error-diffusion approach presented at SIGGRAPH 2001. Our algorithm's parameters are optimized using a simplex downhill search method together with a blue noise based cost function .
Pierre-Marc Jodoin, Victor Ostromoukhov
openaire +1 more source
Modularization of grid cells constrained by the pyramidal patch lattice
iScience, 2021 Summary: Grid cells provide a metric representation of self-location. They are organized into modules, showing discretized scales of grid spacing, but the underlying mechanism remains elusive. In this modeling study, we propose that the hexagonal lattice
Tao Wang +5 more
doaj +1 more source
INDUCED \(nK_{2}\) DECOMPOSITION OF INFINITE SQUARE GRIDS AND INFINITE HEXAGONAL GRIDS
Ural Mathematical Journal, 2022 The induced \(nK_2\) decomposition of infinite square grids and hexagonal grids are described here. We use the multi-level distance edge labeling as an effective technique in the decomposition of square grids.
Dinesan Deepthy +1 more
doaj +1 more source
A web of confocal parabolas in a grid of hexagons
Beiträge zur Algebra und Geometrie / Contributions to Algebra and Geometry, 2022 If one erects regular hexagons upon the sides of a triangle $T$, several surprising properties emerge, including: (i) the triangles which flank said hexagons have an isodynamic point common with $T$, (ii) the construction can be extended iteratively, forming an infinite grid of regular hexagons and flank triangles, (iii) a web of confocal parabolas ...
Peter Moses, Dan Reznik
openaire +3 more sources
Optimal Population Codes for Space: Grid Cells Outperform Place Cells [PDF]
, 2012 Rodents use two distinct neuronal coordinate systems to estimate their position: place fields in the hippocampus and grid fields in the entorhinal cortex.
Stemmler, Martin B. +3 more
core +1 more source