Ridgelines
R-bloggers 2025-11-02
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Day 2 of 30DayMapChallenge: « Lines » (previously).
Representing a digital elevation model as ridgelines…
Config
library(elevatr)library(rnaturalearth)# remotes::install_github("ropensci/rnaturalearthhires")library(terra)library(ggplot2)library(ggridges)Data
ch <- ne_countries(scale = 10, country = "switzerland")ele <- get_elev_raster(ch, z = 9)names(ele) <- "z"
Map
ele |> mask(ch) |> aggregate(fact = 20) |> as.data.frame(xy = TRUE) |> ggplot() + geom_density_ridges(aes(x = x, y = y, group = y, height = z), stat = "identity", alpha = 0.3, color = "red", fill = "white", scale = 10) + labs(title = "Switzerland", caption = paste("Elevation data from https://registry.opendata.aws/terrain-tiles https://r.iresmi.net/", Sys.Date())) + theme_void() + theme(plot.background = element_rect(fill = "grey"), title = element_text(color = "red"), plot.caption = element_text(color = "#777"), plot.margin = margin(2, 2, 2, 5, unit = "mm"))
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