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Starting with rasterpic is very easy! You just need a image (png, jpeg/jpg or tif/tiff) and a spatial object (from the sf or the terra) package to start using it.

Basic usage

We use here as an example the shape of Austria:

library(sf)
library(terra)
library(rasterpic)

# Plot
library(tidyterra)
library(ggplot2)

# Shape and image
x <- read_sf(system.file("gpkg/austria.gpkg", package = "rasterpic"))
img <- system.file("img/vertical.png", package = "rasterpic")

# Create!

default <- rasterpic_img(x, img)

autoplot(default) +
  geom_sf(data = x)

Options

The function provides several options for expanding, alignment and cropping.

Expand

With this option the image is zoomed out of the spatial object:

expand <- rasterpic_img(x, img, expand = 1)


autoplot(expand) +
  geom_sf(data = x)

Alignment

Decide where to align the image:

bottom <- rasterpic_img(x, img, valign = 0)

autoplot(bottom) +
  geom_sf(data = x)

Crop and mask

Create impressive maps!:

mask <- rasterpic_img(x, img, crop = TRUE, mask = TRUE)

autoplot(mask)


maskinverse <- rasterpic_img(x, img, crop = TRUE, mask = TRUE, inverse = TRUE)

autoplot(maskinverse)

Objects admitted for geotagging

  • Spatial object of the sf package: sf, sfc, sfg or bbox.

  • Spatial objects of the terra package: SpatRaster, SpatVector, SpatExtent.

  • A vector of coordinates with the form c(xmin, ymin, xmax, yman)

Image formats admitted

rasterpic can parse the following image formats:

  • png files.
  • jpg/jpeg files.
  • tif/tiff files.