raster (version 1.9-19)

compare: Compare

Description

Evaluate whether a two or more rasters have the same extent, number of rows and columns, projection, resolution, and origin (or a subset of these comparisons). Cell values are not compared by this function.

Usage

compare(x, ..., extent=TRUE, rowcol=TRUE, prj=TRUE, res=FALSE, orig=FALSE, 
			rotation=TRUE, tolerance, stopiffalse=TRUE, showwarning=FALSE)

Arguments

x

A Raster* object

...

Additional Raster* objects

extent

Logical. If TRUE, bounding boxes are compared

rowcol

Logical. If TRUE, number of rows and columns of the objects are compared

prj

Logical. If TRUE projections are compared.

res

Logical. If TRUE, resolutions are compared (redundant when checking extent and rowcol)

orig

Logical. If TRUE, origins are compared

rotation

Logical. If TRUE, rotations are compared

tolerance

Numeric value between 0 and 0.5. If not supplied, the default value is used (see showOptions. It sets difference (relative to the cell resolution) that is permissable for objects to be considered 'equal

stopiffalse

Logical. If TRUE, an error will occur if the objects are not the same

showwarning

Logical. If TRUE, an warning will be given if objects are not the same. Only relevant when stopiffalse is TRUE

Examples

r1 <- raster()
	r2 <- r1
	r3 <- r1
	compare(r1, r2, r3)
	nrow(r3) <- 10
#	compare(r1, r3)
	compare(r1, r3, stopiffalse=FALSE)
	compare(r1, r3, rowcol=FALSE)