terra (version 1.8-29)

project: Change the coordinate reference system

Description

Change the coordinate reference system ("project") of a SpatVector, SpatRaster or a matrix with coordinates.

Usage

# S4 method for SpatVector
project(x, y, partial = FALSE)
# S4 method for SpatRaster
project(x, y, method, mask=FALSE, align_only=FALSE, res=NULL, 
	origin=NULL, threads=FALSE, filename="", ..., use_gdal=TRUE, by_util = FALSE)
# S4 method for SpatExtent
project(x, from, to)
# S4 method for matrix
project(x, from, to)

Value

SpatVector or SpatRaster

Arguments

x

SpatRaster, SpatVector, SpatExtent or matrix (with x and y columns) whose coordinates to project

y

if x is a SpatRaster, the preferred approach is for y to be a SpatRaster as well, serving as a template for the geometry (extent and resolution) of the output SpatRaster. Alternatively, you can provide a coordinate reference system (CRS) description.

You can use the following formats to define coordinate reference systems: WKT, PROJ.4 (e.g., +proj=longlat +datum=WGS84), or an EPSG code (e.g., "epsg:4326"). But note that the PROJ.4 notation has been deprecated, and you can only use it with the WGS84/NAD83 and NAD27 datums. 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

partial

logical. If TRUE, geometries that can only partially be represented in the output crs are included in the output

method

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

bilinear: bilinear interpolation (3x3 cell window). This is used by default if the first layer of x is not categorical

average: This can be a good choice with continuous variables if the output cells overlap with multiple input cells.

near: nearest neighbor. This is used by default if the first layer of x is categorical. This method is not a good choice for continuous values.

mode: The modal value. This can be a good choice for categrical rasters, if the output cells overlap with multiple input cells.

cubic: cubic interpolation (5x5 cell window).

cubicspline: cubic B-spline interpolation. (5x5 cell window).

lanczos: Lanczos windowed sinc resampling. (7x7 cell window).

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

min, q1, median, q3, max: the minimum, first quartile, median, third quartile, or maximum value.

rms: the root-mean-square value of all non-NA contributing grid cells.

mask

logical. If TRUE, mask out areas outside the input extent. For example, to avoid data wrapping around the date-line (see example with Robinson projection). To remove cells that are NA in y (if y is a SpatRaster) you can use the mask method after calling project (this function)

align_only

logical. If TRUE, and y is a SpatRaster, the template is used for the spatial resolution and origin, but the extent is set such that all of the extent of x is included

res

numeric. Can be used to set the resolution of the output raster if y is a CRS

origin

numeric. Can be used to set the origin of the output raster if y is a CRS

threads

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

filename

character. Output filename

...

additional arguments for writing files as in writeRaster

use_gdal

logical. If TRUE the GDAL-warp algorithm is used. Otherwise, a slower internal algorithm is used that may be more accurate if there is much variation in the cell sizes of the output raster. Only the near and bilinear algorithms are available for the internal algorithm

by_util

logical. If TRUE and gdal=TRUE, the GDAL warp utility is used

from

character. Coordinate reference system of x

to

character. Output coordinate reference system

See Also

crs, resample

Examples

## SpatRaster
a <- rast(ncols=40, nrows=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(ncols=94, nrows=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(v, proj=TRUE)
cat(crs(v), "\n")

project(v, "+proj=moll")


project(v, "EPSG:2169")