Downscaling raster maps
What is be the recommended way to downsample a raster map?
The "best" way is subjective, but the main options are, , , , or any combination of those.
Another option is to usefollowed by with a MASK applied. However, that requires that your raster contains no null cells (so you may need to use e.g. first), and it also requires that you can fit the entire raster in memory (so it isn't suitable for very high resolution data).
See also Interpolation