[OSM-dev] mod_tile in other projections?

[Jason Lee]

Kai and all other respondents,
This is great response to my query and I will definitely continue to look
into using the latest mod_tile/renderd code to work - in my specific case -
with British National Grid projection, 27700.

Jason


On 26 March 2013 04:44, Kai Krueger <kakrueger at gmail.com> wrote:

> On 03/07/2013 08:36 AM, Jason Lee wrote:
>
>> Hi all,
>> It might seem an odd question but I'll give it a shot - would
>> mod_tile/renderd support the dynamic generation of map tiles in a map
>> projection other than web mercator? If not, then would it be possible/how
>> difficult would it be to modify the code to support it?
>>
> In case you are still interested, I have now refactored the code a bit to
> make it easier to support different projections. Supporting new projections
> now should be as simple as adding 6 numbers, (the boundaries in projected
> coordinates and the map aspect ratio). For the moment you still need to
> recompile renderd after changing / adding those numbers, but in the future
> that might change.
>
> At the moment it supports spherical mercator and plate carree out of the
> box and they can be mixed in the same rendering server. You configure those
> by changing the srs of the mapnik style sheet to the appropriate values.
>
> Also it is now possible to configure the size of the tiles in renderd.conf
> and it is no longer hard coded to be 256 px. (You still need to change the
> mapnik stylesheet for the appropriate PPI though).
>
> Kai
>
>
>> The only other thing I can think of is using MapProxy with Mapnik backend
>> but I'm not sure the scalabilty/performance compared to mod_tile.
>>
>> Thanks and regards,
>> Jason
>>
>
>
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