[mkgmap-dev] DP Filter and areas at Resolution=24

Thu Nov 26 09:30:40 GMT 2009


Mark Burton wrote:
> Hi Felix,
>
>   
>> Could the DP Filter not remove any points at resolution=24?
>>     
>
> It doesn't do anything at that res.
>
>   
>> Or is there another reason why many small polygons like buildings get 
>> mashed?
>>     
>
> Yes, the reason is that the coordinates round to approx the nearest 2m.
> We can't do anything about that, it's what Garmin support.
>   
okay I see. So the only real solution would be to have intelligent 
filters moving the nodes to nearest 2m in such a way that there is 
minimal loss of detail. Probably pretty CPU intensive and a lot of work.
So we have to live with it, in most places there is no real loss of 
information anyhow.
>  
>   
>> In most cases there are not even any reductions in points needed to draw 
>> the areas.
>>     
>
> Agreed.
>
> Cheers,
>
> Mark
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>   
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