These methods compare the location and resolution of Raster* objects. That is, they compare their spatial extent, projection, and number of rows and columns.
BasicRaster objects you can use
!=, the values returned is a single logical value
For RasterLayer objects, these operators also compare the values associated with the objects, and the result is a RasterLayer object with logical (Boolean) values.
The following methods have been implemented for RasterLayer objects:
==, !=, >, <, <=, >=
A logical value or a RasterLayer object, and in some cases the side effect of a new file on disk.
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 # that do not have the same BasicRaster properties. #r3 <- r1 > r4
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