compare function

Compare Raster objects

Evaluate whether a two or more Raster* objects have the same extent, number of rows and columns, projection, resolution, and origin (or a subset of these comparisons).

all.equal is a wrapper around compareRaster with options values=TRUE, stopiffalse=FALSE and showwarning=TRUE.

compareRaster(x, ..., extent=TRUE, rowcol=TRUE, crs=TRUE, res=FALSE, orig=FALSE,
         rotation=TRUE, values=FALSE, tolerance, stopiffalse=TRUE, showwarning=FALSE)

Arguments

• x: Raster* object
• ...: Raster* objects
• extent: logical. If TRUE, bounding boxes are compared
• rowcol: logical. If TRUE, number of rows and columns of the objects are compared
• crs: logical. If TRUE, coordinate reference systems 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
• values: logical. If TRUE, cell values are compared
• tolerance: numeric between 0 and 0.5. If not supplied, the default value is used (see rasterOptions. It sets difference (relative to the cell resolution) that is permissible for objects to be considered 'equal', if they have a non-integer origin or resolution. See all.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
compareRaster(r1, r2, r3)
nrow(r3) <- 10

# compareRaster(r1, r3)
compareRaster(r1, r3, stopiffalse=FALSE)
compareRaster(r1, r3, rowcol=FALSE)

all.equal(r1, r2)
all.equal(r1, r3)