Transfer values of a SpatRaster to another one with a different geometry

resample transfers values between SpatRaster objects that do not align (have a different origin and/or resolution). See project to change the coordinate reference system (crs).

If the origin and extent of the input and output are the same, you should consider using these other functions instead: aggregate, disagg, extend or crop.

Usage

# S4 method for SpatRaster,SpatRaster
resample(x, y, method, threads=FALSE, filename="", ...)

Arguments

x

SpatRaster to be resampled

y

SpatRaster with the geometry that x should be resampled to

method

character. Method used for estimating the new cell values. One of:

near: nearest neighbor. This method is fast, and it can be the preferred method if the cell values represent classes. It is not a good choice for continuous values. This is used by default if the first layer of x is categorical.

bilinear: bilinear interpolation. This is the default if the first layer of x is numeric (not categorical).

cubic: cubic interpolation.

cubicspline: cubic spline interpolation.

lanczos: Lanczos windowed sinc resampling.

sum: the weighted sum of all non-NA contributing grid cells.

min, q1, med, q3, max, average, mode, rms: the minimum, first quartile, median, third quartile, maximum, mean, mode, or root-mean-square value of all non-NA contributing grid cells.

threads

logical. If TRUE multiple threads are used (faster for large files)

filename

character. Output filename

...

additional arguments for writing files as in writeRaster

Value

SpatRaster

See also

aggregate, disagg, crop, project

Examples

r <- rast(nrows=3, ncols=3, xmin=0, xmax=10, ymin=0, ymax=10)
values(r) <- 1:ncell(r)
s <- rast(nrows=25, ncols=30, xmin=1, xmax=11, ymin=-1, ymax=11)
x <- resample(r, s, method="bilinear")

opar <- par(no.readonly =TRUE)
par(mfrow=c(1,2))
plot(r)
plot(x)

par(opar)