Compare-methods {raster} | R Documentation

## 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, 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:

`==, !=, >, <, <=, >=`

### Value

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

### Examples

    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

[Package raster version 2.5-2 Index]