[OSM-dev] Shaded relief in OSM

[Artem Pavlenko]

On 5 Dec 2007, at 20:43, Jon Burgess wrote:

>
> On Wed, 2007-12-05 at 15:21 +0000, Tom Hughes wrote:
>> In message <D4A3B7AB-5192-4678-A997-9E3EC0060546 at gmail.com>
>>         Artem Pavlenko <artem.mapnik at googlemail.com> wrote:
>>
>>> Jon Burgess pointed me to : http://www.shadedrelief.com/ and I
>>> downloaded some data, warped into Mercator and rendered tiles with
>>> Mapnik.
>>> Here are results : http://mapnik.org/maps/natural_earth/
>>> This is a very rough cut and I'm aware of some problems ..
>>>
>>> Should we be using this data (public domain AFAIK)  for mapnik layer
>>> or on separate layer ? What do cartographers think?
>>
>> I would think the obvious thing to do is to change our current
>> layers to have a transparent background, then we can get OL to
>> render them over other things if we want - be that relief tiles
>> like this or OAM imagery or whatever.
>>
>
> Originally I was thinking that we could use these relief tiles for  
> zoom
> 0 - 4 which currently display only boring vmap0 derived data. These
> relief tiles are based on fairly low resolution data so we could
> probably only use them at a maximum of zoom 6 anyway.
>

Yes, this is my feeling as well. The resolution is no good for high  
zoom levels.
Maybe we should look into creating our own relief maps, specially  
tailored to the OSM.

> It should be easy to slot in an alternate set of tiles for 0-4 with an
> Apache URL rewrite rule on tile without changing anything else.
>
How about two types of layers for z1-5 and one layer for the rest?

> I think we first need to see transparent tiles working as an alternate
> layer for a while before we considered changing the main site. It  
> would
> also take a long time to re-render all the existing tiles.

I'd be very careful here. It'll be difficult to produce transparent  
tiles which will work in all cases.
I see having two sets with different cartography is a better approach.

Artem

>
> 	Jon
>
>
>
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