terra (version 1.0-7)

project: Change the coordinate reference system

Description

Change the coordinate reference system ("project") of a SpatVector or SpatRaster.

Usage

# S4 method for SpatVector
project(x, y, ...)
# S4 method for SpatRaster
project(x, y, method="bilinear", mask=FALSE, 
           filename="", overwrite=FALSE, wopt=list(), ...)

Arguments

x

SpatVector

y

if (x is a SpatRaster, the prefered approach is for y to be a SpatRaster as well, serving as a template for the output SpatRaster. Alternatively, you can provide a character variable containing a textual coordinate reference system (crs).

You can use the following formats to provide textual coordinate reference system (crs) definitions: WKT, PROJ.4 (e.g., +proj=longlat +datum=WGS84), or an EPSG code (e.g., "epsg:4326") to define the output coordinate reference system (crs). But note that when using PROJ.4 you now must use the WGS84 datum. Other datums are silently ignored.

If x is a SpatVector, you can provide a crs definition as discussed above, or any other object from which such a crs can be extracted with crs

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. bilinear: bilinear interpolation. Default. cubic: cubic interpolation. cubicspline: cubic spline interpolation.

mask

logical. If TRUE, mask out areas outside the input extent (see example with Robinson projection)

filename

character. Output filename. Optional

overwrite

logical. If TRUE, filename is overwritten

wopt

list. Options for writing files as in writeRaster

...

additional arguments. None implemented

Value

SpatVector or SpatRaster

See Also

crs, resample

Examples

# NOT RUN {
## SpatRaster
a <- rast(ncol=40, nrow=40, xmin=-110, xmax=-90, ymin=40, ymax=60, 
          crs="+proj=longlat +datum=WGS84")
values(a) <- 1:ncell(a)
newcrs="+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100 +datum=WGS84"
b <- rast(ncol=94, nrow=124, xmin=-944881, xmax=935118, ymin=4664377, ymax=7144377, crs=newcrs)
w <- project(a, b)


## SpatVector
f <- system.file("ex/lux.shp", package="terra")
v <- vect(f)
crs <- "+proj=moll +lon_0=0 +x_0=0 +y_0=0 +ellps=WGS84 +datum=WGS84"
p <- project(v, crs)
p
# }