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icosa (version 0.11.1)

Global Triangular and Penta-Hexagonal Grids Based on Tessellated Icosahedra

Description

Implementation of icosahedral grids in three dimensions. The spherical-triangular tessellation can be set to create grids with custom resolutions. Both the primary triangular and their inverted penta-hexagonal grids can be calculated. Additional functions are provided that allow plotting of the grids and associated data, the interaction of the grids with other raster and vector objects, and treating the grids as a graphs.

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Version

Install

install.packages('icosa')

Monthly Downloads

249

Version

0.11.1

License

GPL-3

Maintainer

Adam Kocsis

Last Published

August 16th, 2024

Functions in icosa (0.11.1)

Create or instantiate an graph class graph from the faces of an icosahedral grid

Legend for a heatmap with predefined colors.

Tessellation guide to hexagrid objects

Global Triangular and Hexa-Pentagonal Grids Based on Tessellated Icosahedra

length,trigrid-method

The number of faces in a trigrid or hexagrid class object.

lines,trigrid-method

Lines method for the trigrid and hexagrid classes

Resampling of data involving a trigrid or a hexagrid object.

Guides for 3d spherical plotting.

names,gridlayer-method

The face names in a facelayer class object

Display the names of the grid elements in 3d plots.

Position of face centers and vertices on a grid

Add an igraph object to a predefined slot in an icosahedral grid

Add a sf object to a predefined slot in a trigrid or hexagrid object

Labels of grid vertices, faces and edges.

Basic lookup function of coordinates on an icosahedral grid

Add a SpatialPolygons object to a predefined slot in a trigrid or hexagrid object

Methods of 3d line plotting

Translating an icosahedral grid object in 3d Cartesian space

Shape distortions of the triangular faces and subfaces

surfacecentroid

Surface centroid point of a spherical point cloud

Plot method for the trigrid, hexagrid or facelayer classes

3d plotting of an icosahedral grid, its subset or a data layer

Rotation of trigrid and hexagrid objects

Extract and replace values from a gridlayer-derived object (e.g. link{facelayer}).

The vertices of an icosahedral grid object

Random point generation on the surface of a sphere

Faces occupied by the specified object

Construct a penta-hexagonal icosahedral grid

The neighbouring faces of faces in an icosahedral grid

Subsetting an icosahedral grid or data layers organized with them

Areas of grid cell surfaces

A triangular icosahedral grid

Tessellation guide to trigrid objects

Extracting and setting the grid orientation

Calculation of point coordinates along an arc

Conversion of polar coordinates to 3d Cartesian coordinates

The face centers of an icosahedral grid object

Calculation of distances along arcs

Spatial polygons from an icosahedral grid

Calculation of distance matrices along arcs

Locate grid faces based on their positions on a map

Conversion of 3d Cartesian coordinates to polar coordinates

Function to plot a set of great circle arcs between points

Create a SpatialLines class object from an icosahedral grid

facelayer-class

A facelayer linked to a trigrid or hexagrid object

Spherical convex hull.

Methods of 3D face plotting.

The edges of a 3d object

Icosahedral grid-based density estimation

[,gridlayer,ANY,missing-method

Extraction from a gridlayer using indices

The face names of a trigrid or hexagrid object

Lengths of grid edges