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raster (version 1.0.4)

Compare-methods: Compare Raster* objects

Description

These methods compare the location and resolution of Raster* objects. That is, they compare their spatial extent, projection, and number of rows and columns. For BasicRaster objects you can use == and !=, the values returned is a single logical value TRUE or FALSE For RasterLayer objects, they also compare the values associated with the objects, and the result is a logical (Boolean) RasterLayer object. And the value returned is a RasterLayer object, if the location and resolution of the two RasterLayers match, or an error of they do not match. The following methods have been implemented for RasterLayer objects: ==, !=, >, <, <=",">=

Arguments

Value

  • A logical value or a RasterLayer object, and in some cases the side effect of a new file on disk.

Details

If the values of the output RasterLayer cannot be held in memory, they will be saved to a temporary file unless a default filename has been set with link[raster]{rasterOptions}. You can also use link[raster]{rasterOptions} to set the format, datatype and overwrite options.

Examples

Run this code
r1 <- raster()
r1 <- setValues(r1, round(10 * runif(ncell(r1))))
r2 <- setValues(r1, round(10 * runif(ncell(r1))))
as(r1, 'BasicRaster') == as(r2, 'BasicRaster')
r3 <- r1 == r2

b <- extent(0, 360, 0, 180)
r4 <- setExtent(r2, b)
as(r2, 'BasicRaster') != as(r4, 'BasicRaster')
# The following would give an error. You cannot compare RasterLayer object that do not have the same BasicRaster properties.
#r3 <- r1 > r4

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