Guillaume Sueur wrote:
Hi,
I've got a problem with mapserver's WMS getCapabilities. My data are
projected in a local projection (EPSG:27563). Apparemtly, the
getCapabilities calculates a LatLongBoundigBox, given in WGS84. But
these values are wrong, with a serious shift on the west.
When I translate the data with ogr2ogr to EPSG:4326 in KML, tha data is
at the correct place in GoogleEarth.
Guillaume,
EPSG:27563 has a prime meridian other than greenwich. I presume that is
causing the problem. In fact, looking through the code I think the latlong
box is actually computed in the GCS of the coordinate system in question,
rather than WGS84. So in your case there is a serious error in the east
west axis, but in other situations people may see small errors due to the
lack of datum adjustment.
I would suggest you file a ticket on it. Specifically the ticket might
note that msOWSPrintLatLonBoundingBox() just passes NULL for the destination
coordinate system, and msProjectPoint() just treats this as a special case
to use the lat/long coordinate system (GCS) associated with the projected
coordinate system. So in this case we see a big error because you are getting
values relative to the paris prime meridian.
This is likely to affect a number of places in MapServer (WMS, and WCS
at least). Please add me ("warmerdam") as a cc on the created ticket.
I might not fix it, but I should at least be able to help.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, [EMAIL PROTECTED]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | President OSGeo, http://osgeo.org
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