Hello, I have also played with some unusual projections and have entcountered the same problem. I use mapserver 4.10 and as interface OpenLayers (on to different machines). Some tiles look good, others not drawn at all or only parts. Also differs the output on both servers. Zooming and the visible layers effect also the output.
Here the example with epsg:44065 http://gis.ibbeck.de/ginfo/ibbOLClient/OpenlayersClient.html?MAPNR=11801&LAY ERS=11500&ZOOM=0&CENTER=0,0 And some others http://gis.ibbeck.de/ginfo/ibbOLClient/OpenLayersClient.html?KARTE=10504 http://gis.ibbeck.de/ginfo/ibbOLClient/OpenlayersClient.html?MAPNR=12800&LAY ERS=11500&ZOOM=0&CENTER=1660129.823,-415032.456 http://gis.ibbeck.de/ginfo/ibbOLClient/OpenlayersClient.html?MAPNR=12400&LAY ERS=11500&ZOOM=4&CENTER=-1426674.0662,-622548.6834 I have looked at many different projections and mostly there were no problems with the output. http://gis.ibbeck.de/ginfo/ibbOLClient/OpenlayersClient.html?MAPNR=12300&LAY ERS=11500&ZOOM=0&CENTER=0,0 The blue screen layer is a shape with 30 degree lines (therefor it looks a bit wrong sometimes), the grids all 1 degree lines. Arnd Wippermann http://gis.ibbeck.de/ginfo/ibbOLClient/OpenlayersClient.html -----Ursprüngliche Nachricht----- Von: UMN MapServer Users List [mailto:[EMAIL PROTECTED] Im Auftrag von Trond Michelsen Gesendet: Mittwoch, 15. November 2006 16:25 An: [email protected] Betreff: [UMN_MAPSERVER-USERS] Problems with mapserver and oblique projections Hi. I'm having some problems getting mapserver 4.4.1 to draw maps in an oblique projection. Here's an example: http://wms.met.no/cgi-bin/mapserv?map=../vhosts/mercator/conf/google.map&LAY ERS=kart,cdc,base.LATLON&TRANSPARENT=false&BGCOLOR=0x99B3CC&EXCEPTIONS=appli cation/vnd.ogc.se_inimage&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST =GetMap&STYLES=&BBOX=-180,-90,180,90&WIDTH=800&HEIGHT=400&SRS=EPSG:44065 ( http://tinyurl.com/ykem3c ) (red coastlines are drawn by mapserver, the grey land, the bluish coastlines and the gridlines are drawn by an internal WMS-server.) As you can see, mapserver omits most of the shapes close to the North Pole, and there are some wrapping issues at the south pole. the proj-definition looks like this: +proj=ob_tran +o_proj=eqc +lon_0=0 +o_lat_p=25 +a=57.29577953604224884 ++b=57.29577953604224884 +no_defs <> (the bizarre minor and major axis sizes are used to get pseudo-decimaldegrees as units. I should probably use some scaling parameter instead, but I was unable to find something that corresponds to the -m command line parameter) and my map is configured like this in the mapfile: LAYER name "cdc" data "cntry00" status on type polygon PROJECTION "+proj=latlong" "+a=6371000" "+b=6371000" END CLASS STYLE outlinecolor 255 0 0 END END END If the tilting is more severe, even more countries are left out of the plot: http://wms.met.no/cgi-bin/mapserv?map=../vhosts/mercator/conf/google.map&LAY ERS=kart,cdc,base.LATLON&TRANSPARENT=false&BGCOLOR=0x99B3CC&EXCEPTIONS=appli cation/vnd.ogc.se_inimage&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST =GetMap&STYLES=&BBOX=-180,-90,180,90&WIDTH=800&HEIGHT=400&SRS=EPSG:44090 With no tilt at all, you basically get regular latlong coordinates, and now all countries are being displayed: http://wms.met.no/cgi-bin/mapserv?map=../vhosts/mercator/conf/google.map&LAY ERS=kart,cdc,base.LATLON&TRANSPARENT=false&BGCOLOR=0x99B3CC&EXCEPTIONS=appli cation/vnd.ogc.se_inimage&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST =GetMap&STYLES=&BBOX=-180,-90,180,90&WIDTH=800&HEIGHT=400&SRS=EPSG:44000 Does anyone know what I'm doing wrong? Is there something I can do to get mapserver to plot all countries in this projection? (Preferrably without the wrapping issues). -- Trond Michelsen
