contour.Rd
Contour lines of a SpatRaster. Use add=TRUE
to add the lines to the current plot. See contour
for details.
if filled=TRUE
, a new filled contour plot is made. See filled.contour
for details.
as.contour
returns the contour lines as a SpatVector.
# S4 method for SpatRaster
contour(x, maxcells=100000, filled=FALSE, ...)
# S4 method for SpatRaster
as.contour(x, maxcells=100000, ...)
SpatRaster. Only the first layer is used
maximum number of pixels used to create the contours
logical. If TRUE
, a filled.contour
plot is made
any argument that can be passed to contour
or filled.contour
(graphics package)
r <- rast(system.file("ex/elev.tif", package="terra"))
plot(r)
contour(r, add=TRUE)
v <- as.contour(r)
plot(r)
lines(v)
contour(r, filled=TRUE, nlevels=5)
## if you want a SpatVector with contour lines
template <- disagg(rast(r), 10)
rr <- resample(r, template)
rr <- floor(rr/100) * 100
v <- as.polygons(rr)
plot(v, 1, col=terrain.colors(7))