rRescale: Change the resolution of a raster
In EhrmannS/rasterTools: Obtain and process earth observation data

Description Usage Arguments Details Value See Also Examples

Rescaling a raster changes the raster's resolution.

1	rRescale(obj, factor = NULL, kernelFunction = NULL)

`obj`	[`RasterLayer(1)`] The object to modify.
`factor`	[`integer(1)` \| `numeric(1)`] an integer for up-scaling and a fraction for down-scaling (see Details).
`kernelFunction`	[`kernelFunction`] A kernel function to determine new values of the rescaled raster, defaulting to `boxKernel()`; see Details.

The factor is a value by which the number of cells in x and y dimension will be multiplied. If the raster should be up-scaled (factor > 1), only integer values are allowed (will be truncated if it is not an integer). If the raster should be down-scaled (factor < 1) any inverse of an integer value (1/n) is allowed (denominator will be rounded to the next integer, such as 1/2 or 1/5).

The kernelFunction used here deviates from the other (morpholological) kernels in that it is a function, which interpolates the values of new cells. See kernelFunction for an in-depth description.

A RasterLayer with a dimension that has been up or down-scaled from obj, where the new values have been determined by applying kernelFunction.

Other operators to modify a raster: rBlend, rReduce, rSegregate

input <- rtRasters$continuous
visualise(input)
visualise(rRescale(input, factor = 0.5))

# up-scaling can be useful for follow-up morphological operations
binarised <- rBinarise(input, thresh = 30)
visualise(rSkeletonise(binarised))

rescaled <- rRescale(binarised, factor = 2)
visualise(rSkeletonise(rescaled), new = TRUE)