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

[Marc Monnerat]

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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