[MapProxy] MapProxy - WMS feed from MapProxy renders tiles with different scale when compared with OSM on MapServer

[Matt Walker]

Hi Andrew,

I would look to see if DPI is a factor, it's possible that the requests to
MapServer include a DPI parameter which my account for the difference.

Matt.
On 19 Aug 2014 18:00, "andrew kovacs" <andrewmrkovacs at gmail.com> wrote:

> Hi,
>
> I am having some trouble figuring out why my cached images in MapProxy are
> a different scale than the source images on MapServer.  I have an OSM
> cache generated on MapServer and I can query this service directly from my
> client.  The WMS feed produces clear images which are the correct scale
> for my map extent.  However, when I request the WMS feed through
> MapProxy, the tiles that are generated (from the same source as the initial
> request) the scale appears to be off.  The images that are generated at
> the client level are not clear.
>
> When I use MapProxy/demo on the server the data appears to be correct.  It
> is only when I request the WMS from a client that the scale is incorrect.
>
> Here is my .yaml file:
>
> services:
>
>   demo:
>
>   tms:
>
>   wms:
>
>     md:
>
>         title: OSM for MapProxy
>
>
>
>
>
> layers:
>
>   - name: mapfile
>
>     title: mapfile test
>
>     sources: [topo_cache]
>
>
>
> caches:
>
>   topo_cache:
>
>     grids: [global_mercator_osm]
>
>     sources: [topo_mapserv]
>
>     meta_buffer: 10
>
>     meta_size: [4, 4]
>
>     format: image/png
>
>     max_shrink_factor: 1
>
>     request_format: image/png
>
>     link_single_color_images: true
>
>     #disable_storage: true
>
>
>
>
>
> grids:
>
>   global_mercator_osm:
>
>     base: GLOBAL_GEODETIC
>
>     num_levels: 19
>
>
>
> sources:
>
>   topo_mapserv:
>
>     type: mapserver
>
>     req:
>
>       layers: default
>
>       map: **************************.map
>
>     concurrent_requests: 4
>
>     mapserver:
>
>       binary: /usr/lib/cgi-bin/mapserv
>
>       working_dir: /2T/mapproxy/mapserver
>
>
>
> I have sample images as well but they are too large for the post..
>
> Any help would be much appreciated.  I have playing with resolutions,
> tile sizes, different grids, image resampling etc.. without any success.
>
> Thanks!
>
> Andrew
>
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