[mapguide-users] WMS from MGOS can't be read by QGIS

Franz1965 fsozzi at INTERCAD.CH
Fri Jan 25 11:11:16 PST 2013

Hi Rémy,

thanks again for your support.

here some answers...

Point 1: I make tests on MGOS on a remote server and on a local AIMS. On
Qgis I use localhost for local AIMS (configured himsel as localhost) and I
use IP for remote server (configured himself with his IP)

Point 2: yes, I already know and I've already played with it with no
success. I don't think the problem is here.

Point 3: I can't clear EPSG:4326. If I do, then QGis give me an error on
BBOX=0,0,0,0. This happens because without EPSG:4326 in row header,
AIMS/MGOS returns capabilities without tag "EX_GeographicBoundingBox". I
think that this is a very important xml tag for QGis, I will explain you
later why.

I discovered the following interesting thing by use of fiddler on QGis and
on Map3D.

Here capabilities for the layer:

- <Layer>
  <Title>Infrastructure Map Server - Web Map Service</Title> 
- <Layer queryable="0" cascaded="0" noSubsets="0" opaque="0">
+ <EX_GeographicBoundingBox>
  <BoundingBox CRS="EPSG:4326" minx="8.371" miny="45.825" maxx="9.174"
maxy="46.629" /> 
  <BoundingBox CRS="EPSG:21781" minx="672480" miny="75270" maxx="732911"
maxy="165701" /> 

Map3D build BBOX values getting them from BoundingBox CRS="EPSG:21781" and
it works.

QGis assign BBOX values with an extention a bit wider, getting values from
EX_GeographicBoundingBox (from capabilities) and transforming in something
very closed to this but a bit wider, only a bit: in that case AIMS/MGOS
returns an error without message. If I get QGis request (got from fiddler)
and replace BBOX with values from BoundingBox CRS="EPSG:21781" (from
capabilities), then it works fine. 

Conclusion: AIMS/MGOS works with BBOX equal or shorter than what expressed
in GetCapabilities values. BBOX with values outside generate an error.

I think that this is a bug. With this limitation a wide range of WMS client
will not work.

View this message in context: http://osgeo-org.1560.n6.nabble.com/WMS-from-MGOS-can-t-be-read-by-QGIS-tp5029828p5029966.html
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