[OSM-dev] [Mapnik-devel] reliefs madness

[Artem Pavlenko]

On 9 Jan 2008, at 09:46, Martijn van Oosterhout wrote:

> On Jan 9, 2008 10:26 AM, Artem Pavlenko  
> <artem.mapnik at googlemail.com> wrote:
>> http://mapnik.org/maps/srtm_relief/
>
> All I can say is *wow*. Does this take a lot of processing power?

It is CPU intensive but reasonably fast. My setup is quite modest -  
mac book intel . For the UK I the output is one large TIFF and yes,  
this  wont work for the whole world. As always, some sort of tiling  
is the key. I'm thinking about creating 200x200 km (??)  tiles  
(TIFFs) for the world and feed them into Mapnik. The only problem I  
ran into so far is memory for creating big rasters  > 10000x10000  
pixel - I only have 1Gb RAM

> Because it would be a nice backdrop for OSM maps.

This is my goal.

>
>> I'm aware of voids and 'below sea level' areas (TODO) and I'm looking
>> for the best solution. Ideas welcome!
>
> The below sea level bit, is that why the bit of NL you can see is a
> funny grey colour?

Yes, and I'm just ignore them for the time being.

>
> Very nice work.
>

Cheers
Artem
> Have a nice day,
> -- 
> Martijn van Oosterhout <kleptog at gmail.com> http://svana.org/kleptog/