This notebook by @kegl shows a nice example of how to use pyresample with xray:
https://www.lri.fr/~kegl/Ramps/edaElNino.html#Downsampling

It would nice to build a wrapper for this machinery directly into xray in some way.

xref #475

cc @jhamman @rabernat