[MapProxy] Render lower/higher zoom levels

[Oliver Tonnhofer]

On 02.02.2012, at 20:55, Martin Kokeš wrote:

> Okay, I added new grid:
> 
> grids:
>  global_mercator_osm:
>    base: GLOBAL_MERCATOR
>    num_levels: 22
> 
> and redefined my cache to use:
> grids: [global_mercator_osm, global_geodetic_sqrt2]
> 
> and got 14-21 zoom levels. Higher zooms are pretty interpolated, bu no matters. Still I'd prefer to have 8-21 zoom levels. Tried to play with max_shrink_factor, but still no luck.

MapProxy would need to load and scale thousand tiles for a WMS request for level 8 when you only have tiles for level 14. You can do this, if you create a grid that starts with the resolution of level 14 (so that you have a grid with level 0-7). MapProxy will scale down from the first level if you request a smaller resolution, but that does only work for a few "level steps".

Regards,
Oliver

-- 
Oliver Tonnhofer    | Omniscale GmbH & Co KG    | http://omniscale.de
http://mapproxy.org | https://bitbucket.org/olt | @oltonn