In rasterutils, add a parameter to choose between ceil/floor (round?) to scale_raster (to decide the number of rows/cols of the destination dataset)

[rbejar]

To decide the number of rows and cols of the scaled raster: the difference is up to one more row/col if we use ceil. With ceil we have to "extrapolate a bit" on that extra row/col, with floor we don't have to extrapolate.

This is, I think, a very minor consideration. For now it always does ceil (that could be the default of this parameter when it is added).