Thanks Gareth,
Next time I do this I'll give the spsample + extract approach  a whirl.
Also, I've learned about the beginCluster()/endCluster() commands - not
sure if extract takes advantage of those at all, but I'll give a check.
Best regards,
mike


On Sun, Sep 8, 2013 at 2:41 AM, Gareth Davies <grothered@gmail.com> wrote:

> Oops -- regarding my last reply, I see now that the approach with
> 'extract' using 'weights' was actually your original method at the start of
> this thread -- so, apparently it is slow. I don't know if the
> spsample+extract approach would be faster or not.
>

	[[alternative HTML version deleted]]

