Plotting¶
Several generic functions have been implemented for SpatRaster objects
to create maps and other plot types. Use ‘plot’ to create a map of a
SpatRaster object. When plot is used with a SpatRaster
, it calls the
function ‘rasterImage’ (but, by default, adds a legend; using code from
fields::image.plot). It is also possible to directly call image
. You
can zoom in using ‘zoom’ and clicking on the map twice (to indicate
where to zoom to). With click
it is possible to interactively query
a SpatRaster object by clicking once or several times on a map plot.
After plotting a SpatRaster
you can add vector type spatial data
(points, lines, polygons). You can do this with functions points, lines,
polygons if you are using the basic R data structures or plot(object,
add=TRUE) if you are using Spatial* objects as defined in the sp
package. When plot is used with a multi-layer SpatRaster object, all
layers are plotted (up to 16), unless the layers desired are indicated
with an additional argument. You can also plot SpatRaster objects with
spplot
. The rasterVis
package has several other lattice
based plotting functions for SpatRaster objects. rasterVis
also
facilitates creating a map from a SpatRaster
with the ggplot2
package.
Multi-layer Raster objects can be plotted as individual layers
library(terra)
b <- rast(system.file("ex/logo.tif", package="terra"))
plot(b)
They can also be combined into a single image, by assigning individual layers to one of the three color channels (red, green and blue):
plotRGB(b, r=1, g=2, b=3)
You can also use the a number of other plotting functions with a
terra
object as argument, including hist
, persp
,
contour
, and density
. See the help files for more info.