ggslippy: Adds a layer created using slippy_overlay() or...

In geoviz: Elevation and GPS Data Visualisation

Description

Adds a layer created using slippy_overlay() or slippy_raster() to a 'ggplot2' chart

Usage

ggslippy(slippy_raster, alpha = 1, set_coord_equal = TRUE)

Arguments

slippy_raster	A raster raster returned by either slippy_raster() or slippy_overlay(return_png = FALSE)
alpha	Opacity of the raster in 'ggplot2'
set_coord_equal	TRUE returns a square plot

Value

a ggplot object

Examples

library(ggplot2)
library(geoviz)

dem <- example_raster()

dem <- raster::aggregate(dem, 10) #aggregate to speed up ggplot for testing

gg_overlay_image <- slippy_overlay(
  dem,
  image_source = "stamen",
  image_type = "watercolor",
  return_png = FALSE,
  max_tiles = 2
  )

ggplot() +
  ggslippy(gg_overlay_image, set_coord_equal = FALSE)

geoviz documentation built on March 26, 2020, 9:15 p.m.