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

[andrew kovacs]

I think the tiles are getting rendered correctly on my side as well.  I get
the same results if I access the WMS coming from MapServer or if I
configure the .yaml file to read the .map file.  I tried matching the
resolutions in .yaml file to the scales coming from MapServer with a DPI of
96 - no success yet.




On Wed, Aug 20, 2014 at 12:16 AM, TDS <tds at tds-net.de> wrote:

>  Hello Matt,
>
> I've been running into same problem. The tiles are rendered correctly.
> It's maybe an issue when accessing the tiles via WMS abstraction. I already
> stripped meta_size and meta_buffer from mapproxy.yaml - no success.
>
> Bye, Mathias
> ------------------------------
>  mailto:tds at tds-net.de <tds at tds-net.de>
>  ------------------------------
>  1+1=10
> You have a question? - 42 or RTFM.
> Am 19.08.2014 um 21:01 schrieb 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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>>
>
>
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