[Mapserver-users] Projection on the Fly Problems

[Ed McNierney]

John -

You aren't providing enough information to specify your UTM projections.  You need to specify the central meridian (i.e. the UTM zone) each is in.

You might find it easier to look up the EPSG codes for each projection and just use the codes.  They're more cryptic but less error-prone.  You can find them at http://mapserver.gis.umn.edu/doc/proj.html

The NAD27 UTM zones are five-digit numbers of the form "267zz" where zz is the two-digit (pad with a leading zero) zone number.  So to define a UTM Zone 9, NAD27 projection you can say:

PROJECTION
	"init=epsg:26709"
END

	- Ed

Ed McNierney
President and Chief Mapmaker
TopoZone.com / Maps a la carte, Inc.
73 Princeton Street, Suite 305
North Chelmsford, MA  01863
ed at topozone.com
(978) 251-4242 



-----Original Message-----
From: John Norton [mailto:jnorton at fs.fed.us]
Sent: Wednesday, April 30, 2003 4:49 PM
To: mapserver-users at lists.gis.umn.edu
Subject: [Mapserver-users] Projection on the Fly Problems


I Have a map file with two layers...
LAYER
   NAME "Fires"
   TYPE POLYGON
   CONNECTIONTYPE OGR
   CONNECTION "c:/msapps/maplab/large_fires/data/l48/tburn111,3"
   STATUS ON
   PROJECTION
     "proj=utm"
     "ellps=clrk66"
     "datum=NAD27"
   END
   CLASSITEM "Status"
    CLASS
      NAME Burning
      Expression "502"
      COLOR 255 0 0
    END
    CLASS
      NAME Burnt
      Expression "501"
      COLOR 255 255 0
    END
END

  LAYER
    NAME "States"
    STATUS ON
    DATA "states"
    TYPE LINE
   PROJECTION
     "proj=utm"
     "ellps=clrk66"
     "datum=NAD27"
   END
    CLASS
      NAME "Boundary"
      SYMBOL 14
      COLOR 120 120 120
      SIZE 1
    END
  END
I am trying to project these using mapscript with code that looks like
this...
$map = ms_newMapObj($map_path."l48c.map");
 $result=$map->setProjection
("proj=aea,ellps=clrk66,datum=NAD27,lat_1=29.5,lat_2=45.5,lat_0=23,lon_0
=-96,x_0=0,y_0=0,units=m",MS_TRUE);
 $image=$map->draw();
 $image_url=$image->saveWebImage(MS_PNG,1,1,0);
$projection = $map->getProjection();

No errors, setProjection returns 0 which I guess means the projection
didn't take but, when I echo $projection it reports the projection string
with commas replace by plus signs. The problem is I get no image. I am
using Mapscript...
                                                                            
                                                                            
                                                                            
  MapServer version 3.6.6-dev OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP 
  SUPPORTS=PROJ SUPPORTS=TTF SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT        
  INPUT=EPPL7 INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE                          
                                                                            
                                                                            


Same thing happens when I run mapscript as a CGI....

MapServer version 3.7 (development) OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
OUTPUT=PD
F OUTPUT=SWF SUPPORTS=PROJ SUPPORTS=TTF SUPPORTS=WMS_SERVER
SUPPORTS=WMS_CLIENT
SUPPORTS=WFS_SERVER SUPPORTS=GD2_RGB INPUT=EPPL7 INPUT=OGR INPUT=GDAL
INPUT=SHAP
EFILE

Is this a units problem my data is in decimal degrees? I think I have PROJ
installed correctly it is in c:\proj with a path to the bin directory. I
also tried (meaning I added it to the PHP.ini file as an extension) the PHP
extension php_proj.dll. Are these conflicting?
Cheers
------------------------------------------------------
John Norton
USDA-RSAC
2222 W 2300 S
Salt Lake City, UT 84119
Phone: 801-975-3766
Fax: 801-975-3478
Intranet: fsweb.rsac.fs.fed.us
Internet: www.fs.fed.us/eng/rsac/
------------------------------------------------------


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