[mkgmap-dev] Making splitter and MultiPolygon code play together

Wed Feb 3 14:10:56 GMT 2010

Chris Miller wrote:
> I'm thinking the best thing to do is to make the cache compulsory (which 
> in turn would make --mixed redundant) and once the cache is generated and 
> all the multipolygons have been found, an additional pass can be made over 
> the ways cache file to determine which nodes fall in which multipolygons 
> and dealt with accordingly. Without a compulsory cache in place this would 
> be very expensive.
> 
> The upside to a compulsory cache is that the code doesn't get too messy and 
> performance doesn't suffer much, plus there will likely be other benefits 
> in the future too. The downside is that a chunk of disk space will always 
> be required by the splitter for writing the cache.
> 
> Does anyone have any objections to this? If not I'll take a look sometime 
> in the next few days. I'll also look at fixing the lack of support in the 
> splitter for relations containing other relations.
> 

No objections here. Disk space due to cache isn't really a problem, even 
when processing the entire planet file.