Hi Chris

> Where to from here? As some of you may have guessed, this new splitter is

Here are a few ideas based on things that we discovered with earlier
versions of the splitter.

* Avoid pathalogical behaviour at the poles by limiting latitude to +- 85.

* Split tiles that are larger than a given absolute size, as even
   an empty file that is big enough will fail.  Not sure what that
   size is, but 63240001 is probably over it.

* There may also be a problem at 180 degrees longitude, caused by the
   overlap.  It might work as long as nothing in the chain
   normalises, for example, 181 to -179.

* Trim off areas that are completly empty, this might help with
   tiles that are mostly ocean with little bits of land around
   the edges.

..Steve
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