worldgraph: Worldwide geographic graphs

In thibautjombart/geograph: Walking through the geographic space using graphs

Worldwide geographic graphs

Description

The datasets 'rawgraph.10k', 'rawgraph.40k', 'worldgraph.10k', and 'worldgraph.40k' are geographic graphs (gGraph objects) of the world, with respective resolutions of 10,242 and 40,962 vertices.

Format

worldgraph.10k and worldgraph.40k are gGraph objects with the following specificities:

@nodes.attr\$habitat

habitat corresponding to each vertice; currently 'land' or 'sea'.

@meta\$color

a matrix assigning a color for plotting vertices (second column) to different values of habitat (first column).

Details

'rawgraph's are raw graphs as obtained directly from the method provided in references.

'worldgraph's are 'rawgraph's that have been modified manually to rectify connectivity between edges at some places. The most noticeable change is that all edges involving sea vertices have been removed.

'worldshape' is a shapefile of countries of the world (snapshot from 1994).

Source

Graph reconstructed by Andrea Manica.

References

=== On the construction of the graph ===
Randall, D. A.; Ringler, T. D.; Heikes, R. P.; Jones, P. & Baumgardner, J. Climate Modeling with Spherical Geodesic Grids Computing in science & engineering, 2002, 4: 32-41.

Examples

worldgraph.10k

## plotting the object
plot(worldgraph.10k, reset = TRUE)
title("Hello world")

## zooming in
geo.zoomin(list(x = c(-12, 45), y = c(33, 75)))
title("Europe")
geo.zoomin(list(x = c(-12, 2), y = c(50, 60)))
plotEdges(worldgraph.10k)
title("United Kingdom")

## zooming out
# geo.zoomout() # needs clicking on device
geo.zoomin(list(x = c(-6, 38), y = c(35, 73)))
title("Europe")

## defining the subset of visible points
x <- worldgraph.10k[isInArea(worldgraph.10k)]
plot(x, reset = TRUE, edges = TRUE)
title("One subsetted object.")

## Not run: 
## interactive zooming
geo.zoomin()

## End(Not run)

thibautjombart/geograph documentation built on Jan. 27, 2024, 10 p.m.