[ gpsdrive ] GPSdrive SVN, Mapnik and a Patch

Mark Wilkinson mark.wilkinson at 2pmtech.com
Thu May 29 04:00:57 AKDT 2008


Hi Guenther

Guenther Meyer wrote:
> Am Donnerstag 29 Mai 2008 schrieb Mark Wilkinson:
>   
>> Point 3 - I had a problem with the maps produced by the mapnik code. the
>> center was always some distance south of where it should have shown. I
>> traced it to the Projection in the mapnik code that used '+proj=merc
>> +datum=WGS84'. When I replaced this with the projection from the mapnik
>> example code, the maps looked to be centered correctly.
>>
>>     
> hmm, I never noticed that, how big was the deviation?
>   

I'm not sure how to measure this... it was enough to throw my location 
in plymouth UK, several miles into the english channel.. guess i'm gonna 
have to figure it out now :-)

>   
>> Points 1,2,4 - I've added additional config parameters,
>>
>>     
> fine, thanks!
> the initial inclusion of mapnik was a very quick hack. we were glad, that it 
> worked at all. but it really IS better, to have these things configurable.
>
>   
>> Additionally, rather than generating the mapnik xml file everytime
>> gpsdrive is run, I've coded it to check the modification times on both
>> the xml file (if it exists) and the xml template file and only generate
>> the xml file if the template is newer.
>>
>>     
> sounds reasonable.
>
>   
>> Like I said at the top, this may not be the right place to post this
>> patch, but it may be of benefit to others.
>>
>>     
> this is exactly the right place for patches, thank you very much :-)
> I will have a look and apply them to svn...
>
>   
:-) wonderful, I look forward to seeing them there.
>   
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