`linemap`: Create Maps Made of Lines

Example

The package contains two functions: linemap and getgrid

`linemap`

linemap displays a map made of lines from a data frame of gridded data.

library(linemap)
library(sf)
data("popOcc")
data("occitanie")
opar <- par(mar=c(0,0,0,0), bg = "ivory2")
plot(st_geometry(occitanie), col="ivory1", border = NA)
linemap(x = popOcc, var = "pop", k = 2.5, threshold = 50,
        col = "ivory1", border = "ivory4", lwd = 0.6, add = TRUE)
par(opar)

`getgrid`

getgrid transforms a set of polygons (POLYGONS or MULTIPOLYGONS, sf objects) into a suitable data frame for linemap.

library(linemap)
library(sf)
data("bretagne")
data("france")
plot(st_geometry(bretagne))

bret <- getgrid(x = bretagne, cellsize = 2000, var = "POPULATION")
bret[6010:6014,]

	X	Y	POPULATION
6010	340217.1	6783195	670.7509
6011	342217.1	6783195	1050.2651
6012	344217.1	6783195	1410.0992
6013	346217.1	6783195	2304.2012
6014	348217.1	6783195	2875.4047

opar <- par(mar = c(0,0,0,0))
plot(st_geometry(france), col="lightblue3", border = NA, bg = "lightblue2",
     xlim = c(min(bret$X), max(bret$X)), ylim= c(min(bret$Y), max(bret$Y)))
linemap(x = bret, var = "POPULATION", k = 5, threshold = 1,
        col = "lightblue3", border = "white", lwd = 0.8,
        add = TRUE)
par(opar)

Installation

library(devtools)
install_github("rCarto/linemap")

Inspiration

Unknown Pleasures (Joy Division)
Population Lines: How and Why I Created It (James Cheshire)
GeospatialLineGraphs (Ryan Brideau)

linemap: Create Maps Made of Lines