Hi,
The Web Mercator projection is in meters too and your map will be switched off
also with EPSG:27700 if you zoom far enough. Due to differences in projection
settings the turn on/off may not happen in exactly same visible scale. Play
with the MAXSCALEDENOM value and perhaps you will find something that works for
both of your projections. If not, you can always copy the whole LAYER with a
different name and edit the new layer to be optimal for OpenLayers.
-Jukka Rahkonen-
Donald Kerr wrote:
Jukka,
Got it! DEBUG 5 spotted the error:
Skipping layer (CME) because LAYER.MAXSCALE is too small for this MAP
scale
I have the following:
MINSCALEDENOM 1
MAXSCALEDENOM 36000
SYMBOLSCALEDENOM 24000
If I comment them out then all is well and the required image is created and
served.
Now, the issue would appear to be that these figures are relevant to 27700
and work with that in metres but do not work with 900913 which I assume is
in degrees. The request SRS for a WMS is controlled by Openlayers so this is
fixed as 90013 and I do have the map set for metres. The BBOX must be sent
from Openlayers in degrees so I am think that this is where the problem is.
Maybe I cannot use MAXSCALEDENOM in these circumstances where I need
to serve in two projections.
Many thanks.
Regards,
Donald
-Original Message-
From: Rahkonen Jukka [mailto:jukka.rahko...@mmmtike.fi]
Sent: 20 May 2013 05:53
To: Donald Kerr; mapserver-users@lists.osgeo.org
Subject: Re: [mapserver-users] Mapserver WMS Reprojection
Hi,
I do not see obvious error and the 900913 BBOX hit UK somewhere in
Scotland so I guess that you have data there. I was thinking that the fake
900913 code is perhaps not included in the EPSG file and you should use
EPSG:3785 instead but that case that would propably lead to some error
message. Have still a try with 3785, and add DEBUG 5 into your layer setting
and see what you get into your MS_ERRORFILE.
-Jukka Rahkonen-
Donald Kerr wrote:
Slight mistake below; the projection definition in the layer is as
follows with epsg in lowercase as I am led to believe that it should
be
so:
init=epsg:27700
-Original Message-
From: mapserver-users-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Donald Kerr
Sent: 19 May 2013 20:36
To: mapserver-users@lists.osgeo.org
Subject: [mapserver-users] Mapserver WMS Reprojection
Hi List,
I am trying to reproject a WMS request from 27700 (UK Ordnance Survey)
to
900913 (OSM OpenStreetMap) without success. There no issue with the map
file map or layer definitions in terms of serving up the WMS in 27700 but
reprojection seems to fail. There appears to be very little online and I
cannot
find a solution; hence this request for help or advice.
Relevant parts of map file (some parts removed):
PROJECTION
init=epsg:27700
END
WEB
METADATA
wms_title My WMS
wms_onlineresource http://localhost/mapserver/mapserv.asp?;
wms_srs EPSG:27700 EPSG:900913
wms_enable_request *
wms_abstract My WMS
wms_extent 0 0 67 123
wms_feature_info_mime_type text/plain
wms_feature_info_mime_type text/html
wms_feature_info_mime_type application/vnd.ogc.gml #
info_format=application/vnd.ogc.gml
..
Layer:
METADATA
wms_title CME
wms_extent 0 0 67 123
#wms_srs EPSG:27700 EPSG:900913
wms_include_items all # No spaces
gml_include_items all # No spaces
gml_featureid ID
END
PROJECTION
init=EPSG:27700
END # PROJECTION
Openlayers request:
http://maps1/cgi-
bin/mapserv.exe?MAP=D:\MyMapFile.mapLAYERS=CMETRANS
PARENT
=TRUEFORMAT=pngSERVICE=WMSVERSION=1.1.1REQUEST=GetMap
STYLES=SRS=EPSG%3
A900913BBOX=-484682.60504583,7512726.3043776,-
415889.27960147,7547122.96709
97WIDTH=900HEIGHT=450
The result is a transparent image with no data showing. :( The same
map file
works correctly and serves an image if used with Openlayers and a map on
EPSG 27700 so it's pointing at the reprojection of the BBOX maybe.
What am I doing wrong? Any help greatly appreciated.
Many thanks.
Regards,
Donald
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