Hi,
thank you Frank, Trond and Ed for your help. I tried to use reporjected
coordinates as BBOX-values in my "new" WMS-GetMap-request (SRS=WPSG:4326) and
it works now. I got the new reprojected coordinates out of the GetCapabilities
document (I took them out of the LatLonBoundingBox paragraph in the
GetCapabilities document):
<Layer queryable="1" opaque="0" cascaded="0">
<Name>VIEW_RWG_TBS</Name>
<Title>RWG_TM_NR</Title>
<SRS>EPSG:31468</SRS>
<SRS>EPSG:4326</SRS>
<LatLonBoundingBox minx="10.9905" miny="49.3319" maxx="11.2852"
maxy="49.5441" />
<BoundingBox SRS="EPSG:31468"
minx="4.42695e+006" miny="5.46647e+006" maxx="4.44806e+006"
maxy="5.48982e+006" />
<Style>
<Name>default</Name>
<Title>default</Title>
<LegendURL width="20" height="10">
<Format>image/png</Format>
<OnlineResource xmlns:xlink="http://www.w3.org/1999/xlink";
xlink:type="simple"
xlink:href="http://10.65.112.50/cgi-bin/mapserv.exe?map=/ms4w/apache/htdocs/WMS/WMS_BRWK.map&version=1.1.1&service=WMS&request=GetLegendGraphic&layer=VIEW_RWG_TBS&format=image/png"/>
</LegendURL>
</Style>
</Layer>
But I have two further questions:
When I do a WMS-GetMap-request in the "new" SRS (EPSG:4326) the map maserver
sends back does not vary form the map mapserver generates when sending a
GetMap-request in the "original" SRS (EPSG:31468). I mean there is no
deformation/distortion noticeable. But when I do a "normal" mapserver
mode=browse-request in my simple pan and zoom template and tell mapserver to
reproject the data in EPSG:4326 (I do that by putting the PROJECTION-object in
the MAP-object of the .map-file to "init=epsg:4326" while the
PROJECTION-objects in the LAYER-objects are still in the "origninal"
"init=epsg:31468" projection. Of course I change the EXTENT-parameters in the
.map-file too. Am I doing right?) the returned map looks different from the map
genereated using the "original" projection. I mean that the reprojected map
using mode=browse looks deformed/distorted compared to the "original" not
reprojected map.
The question is now: Why do the two maps (the reprojected one I get from the
WMS-GetMap-request and the reprojected map I get by a mode=browse request)
differ in their appearence (distortion) although I tell mapserver in both cases
to reproject the map to "epsg:4326"?
The secoond question is: As mentioned I got the "new" reprojeted coordinates
for BBOX-values out of the GetCapabilities document. But is there a program
that could do coordinate transformation for me, so that I am able to transform
"epsg:31468" coordinates to "epsg:4326" coordinates?
OK, that's it. Thak you again for your helpful hints. And would be very nice of
you if you could help me further on with my problems/questions elucidated in
this email. Thank you so much.
regards
Daniel
-------- Original-Nachricht --------
Datum: Thu, 27 Jul 2006 09:22:21 -0400
Von: Ed McNierney <[EMAIL PROTECTED]>
An: [email protected]
Betreff: Re: [UMN_MAPSERVER-USERS] WMS and SRS
> Daniel -
>
> I think Frank's theory is likely to be correct, and that there is a
> problem with the BBOX coordinates used in your new request. It sounds like
> the
> changes you made are fine, although I think it is not necessary to add all
> supported SRS systems to the metadata for each layer - just the MAP-level
> metadata should be all you need to do.
>
> Can you post the SRS= and BBOX= parameters you are using in your original
> epsg:31468 request and in the new epsg:4326 requests?
>
> - Ed
>
> Ed McNierney
> President and Chief Mapmaker
> TopoZone.com / Maps a la carte, Inc.
> 73 Princeton Street, Suite 305
> North Chelmsford, MA 01863
> [EMAIL PROTECTED]
> (978) 251-4242
>
> -----Original Message-----
> From: UMN MapServer Users List [mailto:[EMAIL PROTECTED] On
> Behalf Of Daniel Goetz
> Sent: Thursday, July 27, 2006 3:05 AM
> To: [email protected]
> Subject: [UMN_MAPSERVER-USERS] WMS and SRS
>
> Hi coummunity,
>
> I built up a littel WMS-server with umn-mapserver (local installation;
> ms4w 2.1). The "original" projection of the single Layers is alway epsg:31468
> (these are cartesian Gauß-Krüger-coordiantes). So I set the
> PORJECTION-object of each LAYER and in the MAP-object to "init=epsg:31468".
> In the
> METADATA of the MAP-object as well as in the single LAYER-objects I defined
> "wms_srs" as "EPSG:31468" as well. For testing purpose I did some
> WMS-GetMap-Requests with "SRS=EPSG:31468" and everything went fine.
>
> But now I want to make my WMS-service more interchangeable, so I want to
> define some more SRSs in that the WMS should be able to be displayed. I want
> to make it possible to "transform" (don't know the exact word in english)
> the WMS from its original Projection to another SRS (e.g. WGS 84;
> EPSG:4326). In my opinion this should be possible by adding another epsg-code
> to the
> METADATA. So my METADATA (both in the MAP and in the LAYERs-objects) look
> like this: "wms_srs" "EPSG:31468 EPSG:4326".
>
> But now every time I change the SRS block in my WMS-GetMap-request from
> "SRS=EPSG:31468" to "SRS=EPSG:4326" mapserver returns a blank image. I even
> tried to set the BBOX to latlon-coordinates when using "SRS=EPSG:4326" but
> even this failed. I also testes other SRSs (both geographic ones and real
> projections) but with no success.
>
> Could anybody please give me some help or hints what to do and what went
> wrong and why did this happen? I would be very glad and thankful. Thank you
> so much.
>
>
> regards
>
>
> Daniel
>
>
> --
>
>
> Der GMX SmartSurfer hilft bis zu 70% Ihrer Onlinekosten zu sparen!
> Ideal für Modem und ISDN: http://www.gmx.net/de/go/smartsurfer
--
Echte DSL-Flatrate dauerhaft für 0,- Euro*. Nur noch kurze Zeit!
"Feel free" mit GMX DSL: http://www.gmx.net/de/go/dsl
