extend: Extend

In terra: Spatial Data Analysis

Extend

Description

Enlarge the spatial extent of a SpatRaster. See crop if you (also) want to remove rows or columns.

You can also enlarge a SpatExtent with this method, or with algebraic notation (see examples)

Usage

## S4 method for signature 'SpatRaster'
extend(x, y, snap="near", fill=NA, filename="", overwrite=FALSE, ...) 

## S4 method for signature 'SpatExtent'
extend(x, y) 

Arguments

x	SpatRaster or SpatExtent
y	If x is a SpatRaster, y should be a SpatExtent, or an object from which it can be extracted (such as SpatRaster and SpatVector objects). Alternatively, you can provide two positive integers indicating the number of rows and columns that need to be added at each side (or a single positive integer when the number of rows and columns is equal) If x is a SpatExtent, y should be a numeric vector of 1, 2, or 4 elements
snap	character. One of "near", "in", or "out". Used to align y to the geometry of x
fill	numeric. The value used to for the new raster cells
filename	character. Output filename
overwrite	logical. If TRUE, filename is overwritten
...	additional arguments for writing files as in writeRaster

Value

SpatRaster or SpatExtent

See Also

crop, merge, ext

Examples

r <- rast(xmin=-150, xmax=-120, ymin=30, ymax=60, ncols=36, nrows=18)
values(r) <- 1:ncell(r)
e <- ext(-180, -100, 40, 70)
re <- extend(r, e)

# extend with a number of rows and columns (at each side)
re2 <- extend(r, c(2,10))

# SpatExtent
e <- ext(r)
e
extend(e, 10)
extend(e, c(10, -10, 0, 20))

terra documentation built on Jan. 17, 2023, 5:18 p.m.