[mkgmap-dev] New splitter version, big memory savings

Thu Sep 3 14:10:02 BST 2009

And are (large) polygons that span many tiles fully supported?

Steve Ratcliffe wrote:
> 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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