nothing shows up! no image or error?

Wed Jul 5 14:25:49 EDT 2006

Albert, 

Projection in MapServer isn't handled with an external file, like in ArcMap.   It is done in the map file.  Take a look at the Mapfile documentation to see how to do projection. 

http://mapserver.gis.umn.edu/docs/reference/mapfile/projection/view

You need to define a projection block in the MAP block of the map file, this is set to the projection that you want your data output in.  

You would then define a projection block in each layer, this is set to the projection that the original data for that layer is in.  It is easiest to use epsg codes, look at example 2 in the link above.  

The epsg code for UTM zone 14N nad83 is 26914  and 4326 can be used for you lat/long data.

David.

	-----Original Message-----
	From: Albert Anderson [mailto:bart_doggers at yahoo.com] 
	Sent: Wednesday, July 05, 2006 11:58 AM
	To: Fawcett, David; MAPSERVER-USERS at lists.umn.edu
	Subject: RE: [UMN_MAPSERVER-USERS] nothing shows up! no image or error?

	Hi,

	 I was using a projection file UTM Zone 14n Nad_83. Then I switch to an unprojective file and I saw my data show up.  What would be the first best step for setting a projection file?

	Thanks
	Albert

	"Fawcett, David" <David.Fawcett at state.mn.us> wrote: 

		You may want to take a look at your extent.  

		Do you really intend to show a primarily empty stretch of the northern Atlantic Ocean (apologies to Canary Islanders...)?  

		You are telling MapServer that your map area is contained within a box from 50 deg. west longitude to 10 deg. west longitude and 20 to 90 degrees north latitude.  If the name of your mapfile relates to the data, I am guessing that Richland County isn't in this box.  

		Use ogrinfo or a desktop GIS app to look at the extent of your data.  Also, the extent needs to be in the units of the spatial reference system that your data is in.  

		David.

			-----Original Message-----
			From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On Behalf Of Albert Anderson
			Sent: Wednesday, July 05, 2006 10:10 AM
			To: MAPSERVER-USERS at LISTS.UMN.EDU
			Subject: [UMN_MAPSERVER-USERS] nothing shows up! no image or error?

			Hi,

			 I am making my own map file.  It looks all right but when I click the button it doesnt show an image or any kind of errors.  

			Here is my map code.
			#This is Richland County Map Server
			NAME "Richland"
			SIZE 100 100
			IMAGECOLOR 255 255 255
			IMAGETYPE JPEG
			SHAPEPATH "/home/mapdata/"
			EXTENT -50.00 20.00 -10.00 90.00
			WEB
			  TEMPLATE '/var/www/htdocs/richland.html'
			  IMAGEPATH '/var/www/htdocs/tmp'
			  IMAGEURL '/tmp/'
			END
			LAYER
			    NAME "Richland"
			    STATUS default
			    TYPE polygon
			    DATA "RICH_bndy"
			    CLASS
			       STYLE
			               COLOR 0 0 0
			       END
			    END
			END
			END

			here is my html code
			<html>
			<head><title>Richland County MapServer</title></head>
			<body>
			  <form method=post action="/cgi-bin/mapserv">
			    <input type="submit" value="Click Me"
			    <input type="hidden" name="map"
			              value="/home/mapdata/richland.map">
			    <input type="hidden" name="map_web_imagepath"
			              value="/var/www/htdocs/tmp/">

			  </form>
			  <table border="1" width="400" height="400">
			  <tr>
			  <td align="center" valign="top">
			  <IMG SRC="[img]" width="400" height="400" border="1">
			  </td>
			  </tr>
			  </table>
			</body>
			</html>

			 I really dont know whats could be wrong.  Maybe the extent of it?  Can anyone help me?

			Thanks,
			Albert

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