[MapProxy] Render lower/higher zoom levels

[Martin Kokeš]

Hello Oliver,

still can't get a little bit of WMS scaling to work. This is actually what I got:
---
layers:
  - name: ortofoto
    title: Ortofoto
    sources: [ortofoto_cache]

caches:
  ortofoto_cache:
    grids: [global_mercator_osm]
    sources: [ortofoto_wms]
    format: image/jpeg
    link_single_color_images: true
    cache:
      type: file
      directory_layout: tms

sources:
  ortofoto_wms:
    type: wms
    req:
      url: http://geoportal.cuzk.cz/WMS_ORTOFOTO_PUB/service.svc/get
      layers: GR_ORTFOTORGB
    min_scale: 1
    max_scale: 28000
    supported_srs: ['EPSG:900913']

grids:
  global_mercator_osm:
    base: GLOBAL_MERCATOR
    num_levels: 21
---
With this configuration my Mapproxy TMS serves a
http://localhost/mapproxy/tiles/1.0.0/ortofoto_EPSG900913/14/8911/10827.jpeg as blank jpeg.
http://localhost/mapproxy/tiles/1.0.0/ortofoto_EPSG900913/15/17822/21654.jpeg works.

ortofoto_wms service is restricted by WMS provider to:
<MinScaleDenominator>1</MinScaleDenominator>
<MaxScaleDenominator>28000</MaxScaleDenominator>

So I set up
    min_scale: 1
    max_scale: 28000

It is possible to take 4.77731426782 resolution requests (they obviously work) and scale them down to get 9.55462853565 and 19.1092570713?

With regards

Martin

----- Original Message -----
From: Oliver Tonnhofer
[mailto:olt at omniscale.de]
To: martin at tuningmedia.cz
Cc:
mapproxy at lists.osgeo.org
Sent: Fri, 03 Feb 2012 09:55:30 +0100
Subject: Re:
[MapProxy] Render lower/higher zoom levels


> 
> 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
> 
> 
> 
> 
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