[MapProxy] Reprojecting to EPSG:4326 cuts data at prime meridian.

[Oliver Tonnhofer]

Hi,

that might be a bug.

We need to find the root-cause of that issue to be able to create a fix. It’s easy if we can reproduce a bug, it’s really hard if we can’t. In order to reproduce this bug, we need as much information as you can provide:

- Does the bug show up with `mapproxy-util serve-develop`, or only in full deployment?
- Can you provide a minimal configuration that triggers this bug?
- What requests do you make (WMS, WMTS, etc.)? Can you provide URLs of example requests?


BTW: Your examples are not working (403).

Regards,
Oliver

-- 
Oliver Tonnhofer  | Omniscale GmbH & Co KG  | http://omniscale.com
OpenStreetMap WMS and tile services         | http://maps.omniscale.com




> On 01.09.2015, at 16:53, Marc Monnerat <procrastinatio at gmail.com> wrote:
> 
> Hello,
> 
>  My goal is to reproject a WMTS source in EPSG:21781 into EPSG:4326, as a WMTS service (or eventually a WMS service). This is working fine for projection like EPSG:2056 (LV95), EPSG:3857 (webmercator) or EPSG:4258 (ETRS89). But using EPSG:4326, I get some strange result.
> 
> 
> Checking the result in the MapProxy Demo page, using the EPSG:4326 ans the WMS service:
> 
> 
> http://mf-chsdi3.dev.bgdi.ch/mom_fix_1594/mapproxy/demo/?srs=EPSG%3A4326&format=image%2Fpng&wms_layer=ch.swisstopo.zeitreihen_20031231
> 
> 
> we find that there is *no* data West of the prime meridian of (city of Bern, if you know Switzerland, 600'000m easting or about 7.5° West in WGS84).
> 
> 
> The same layer, using the WMTS service, displays the same problem:
> 
> 
> http://codepen.io/procrastinatio/pen/XmWEZL?editors=001
> 
> 
> The prime meridian is one of the vertical purple line.
> 
> 
> In comparison, using EPSG:4258 (ETRS89), which is "almost" identical to EPSG:4326, data are displayed correctly both side of the meridian, as shown in the demo
> 
> 
> http://mf-chsdi3.dev.bgdi.ch/mom_fix_1594/mapproxy/demo/?srs=EPSG%3A4258&format=image%2Fpng&wms_layer=ch.swisstopo.zeitreihen_20031231
> 
> 
> We are using MapProxy Version 1.8.0 and the configuration file is https://raw.githubusercontent.com/geoadmin/mf-chsdi3/master/mapproxy/mapproxy.yaml (very long).
> 
> 
> 
> 
> If anyone has a hint, I would be glad.
> 
> 
> 
> 
> Thank you in advance!
> 
> 
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