Hi All, I'm posting further findings and observations. I made a simple mapfile and dumped the shape information to a .shp file. I have made a .zip file with all of the components to verify what I will be saying, and will provided it upon request to individuals (don't want to pollute inboxes on the listserv indiscriminantly).
First, I have discovered that when I render the shapefile NOT as a WMS, but just with a url like: http://localhost/cgi-bin/mapserv.exe?map=C:\ms4w\Apache\htdocs\tb\ex.map&mode=map the coords are unprojected, and I get the expected (tall and skinny) map of MN. When I call mapserver as a WMS (with epsg:26915), like: http://localhost/cgi-bin/mapserv.exe?map=C:\ms4w\Apache\htdocs\tb\ex.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&LAYERS=state&BBOX=184056.505,4809728.25,767381.245,5478975.75&SRS=EPSG:26915&format=image/png&width=800&height=600 then I get a map, but the map stretches to the dimensions I set the image 'height' and 'width' parameters to. This does not happen with the non-WMS request. So the point is, my WMS map calls stretch as a function of the image width and height (which is how it is called for openlayers). If I want the unprojected map via WMS (that doesn't stretch based on the tile image dimensions), how do I configure my WMS url, or .map file (particularly for openlayers)? Thanks again for everybody's help, Matt On Tue, Jun 10, 2008 at 11:26 AM, Barend Kobben <[EMAIL PROTECTED]> wrote: > Hi, > > It looks like your mixing up several things that shouldn't be mixed: > > 1) > http://localhost/cgi-bin/mapserv.exe?map=C:\ms4w\Apache\htdocs\ol\wms.map&SE > RVICE=WMS&VERSION=1.1.1&REQUEST=GetCapabilities > ...is a valid WMS GetCapabilities request. It might result in a valid WMS > response (although I cannot test this as I obviously do not have the same > localhost as you...) > > However: > http://localhost/cgi-bin/mapserv.exe?map=C:\ms4w\Apache\htdocs\ol\wms.map&mo > de=map > ...is a non-WMS request, it uses the 'old' MapServer CGI mode, not the OGC > standardised WMS interface. To get a map the "WMS way" you'd request > something like: > http://localhost/cgi-bin/mapserv.exe?map=C:\ms4w\Apache\htdocs\ol\wms.map&m&; > SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&LAYERS=aLayer&BBOX=1,2,3,4& > SRS=EPSG:4326&format=image/gif > > 2) next, you advertise your data to be in lat-lon on the WGS 84 (PROJECTION > init=epsg:4326), but you proclaim the EXTENT of the data to be in meters or > some other projected unit: > EXTENT 184056.505 4809728.25 767381.245 5478975.75 > This obviously are not lat-lon degrees (which have a max extent of > -180,180,-90,90)... Now MS will be really confused! "Hmmmm, this client > wants lat-lon data that stretches over the whole of the universe..." :-) > > 3) you then advertise the WMS to be able to deliver data in a non-projected > and a projected SRS: > "wms_srs" "EPSG:4326 EPSG:26915" > Which is fine, but you do it again for the LAYER, which I think is > superfluous. > > 4) You do NOT tell the WMS what SRS the data originally is in. There is no > PROJECTION object in the LAYER, which in some case might lead to MapServer > trying to find out for itself, BUT NOT in the Postgis case you have. A > connection to PostGIS in itself needs to be told which projection to fetch > the data in (because PosGIS can reproject if necessary). One of the ways of > doing that is to make the DATA statement a bit more elaborate than > "the_geom from shp_state", instead use > DATA "the_geom from shp_state using unique <your_primary_key> using > srid=26915" > > Hope this helps... > > -- > Barend Köbben > International Institute for Geo-Information > Sciences and Earth Observation (ITC) > PO Box 6 > 7500AA Enschede, The Netherlands > +31 (0)53 4874253 > > International Institute for Geo-Information Science and Earth Observation > (ITC) > Chamber of Commerce: 410 27 560 > > E-mail disclaimer > The information in this e-mail, including any attachments, is intended for > the addressee only. If you are not the intended recipient, you are hereby > notified that any disclosure, copying, distribution or action in relation to > the content of this information is strictly prohibited. If you have received > this e-mail by mistake, please delete the message and any attachment and > inform the sender by return e-mail. ITC accepts no liability for any error or > omission in the message content or for damage of any kind that may arise as a > result of e-mail transmission. > -- It is from the wellspring of our despair and the places that we are broken that we come to repair the world. -- Murray Waas _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
