[mapserver-users] Imagemap size doesn't match display map

[sscottgis]

David,

That did the trick. Thanks.



Fawcett, David wrote:
> 
> Soren, 
> 
> I think that you are running into the issue where a WMS request can
> return non-square pixels, and that the ratio of height:width in your
> extent is not the same as the ratio of height:width in your image size.
> 
> 
> If you can make this as a regular CGI call, you won't see this problem.
> If you need to use WMS, make sure that you make the ratio's the same.  
> 
> e.g. 500/275 does not equal 60/26.
> 
> David.
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of sscottgis
> Sent: Friday, January 09, 2009 12:48 PM
> To: mapserver-users at lists.osgeo.org
> Subject: [mapserver-users] Imagemap size doesn't match display map
> 
> 
> 
> I have created an imagemap/image for the lower 48 states using 2
> mapfiles to define the polygons following the demo in the wiki. They
> noted that if you use separate maps, the SIZE and EXTENT should be the
> same. I have those set the same in both files, but the imagemap that
> gets returned is vertically squished.
> 
> Here's the map file for the imagemap layer:
> 
> MAP
> NAME "droughtplan_imgmap"
> STATUS ON
> SIZE 500 275
> 
> # set projection for map
> PROJECTION
>   "init=epsg:4326"
> END
> 
> EXTENT -126 24 -66 50 
> UNITS METERS
> STATUS ON
> IMAGECOLOR 255 255 255
> 
> WEB
>   IMAGEPATH "e:/ms4w/tmp/ms_tmp/"
>   IMAGEURL "/ms_tmp/"
> END
> 
> #QUERYMAP
> #  STATUS ON
> #  STYLE NORMAL
> #END
> 
> LAYER
>   NAME "droughtplans_imgmap"
>   STATUS DEFAULT
>   TYPE POLYGON
>   DATA "../data/droughtplans_imgmap"
>     TEMPLATE "planbody.html"
>     HEADER "planheader.html"
>     FOOTER "planfooter.html"
>     
>   CLASSITEM "State"
>   	CLASS
>   	  COLOR -1 -1 -1
>   	  NAME "State"
>   	  OUTLINECOLOR 110 110 110
>   	END
>   END
> END
> END
> 
> and the file for the display layer:
> MAP
> NAME "droughtplan_wms"
> STATUS ON
> SIZE 500 275
> 
> # set projection for map
> PROJECTION
>   "init=epsg:4326"
> END
> 
> EXTENT -126 24 -66 50 
> UNITS METERS
> STATUS ON
> IMAGECOLOR 255 255 255
> 
> # image format
> OUTPUTFORMAT
>   NAME png
>   DRIVER "GD/PNG"
>   MIMETYPE "image/png"
>   IMAGEMODE RGB
>   EXTENSION "png"
> END
> 
> WEB
>   IMAGEPATH "e:/ms4w/tmp/ms_tmp/"
>   IMAGEURL "/ms_tmp/"
>   HEADER "../templates/query_header.html"
>   FOOTER "../templates/query_footer.html"
> END
> 
> QUERYMAP
>   STATUS ON
>   STYLE NORMAL
> END
> 
> LAYER
>   NAME "droughtplans"
>   STATUS DEFAULT
>   TYPE POLYGON
>   DATA "../data/droughtplans"
>   
>   DUMP TRUE
>   
>   HEADER ../templates/ndmc_query_header.html
>   TEMPLATE ../templates/ndmc_query_body.html
>   
>   CLASSITEM "Status"
>   	CLASS
>   		COLOR 255 255 255
>   		OUTLINECOLOR 110 110 110
>   		EXPRESSION "0"
>   		NAME "No Plan"
>   		SYMBOL 0
>   	END
>   	CLASS
> 			COLOR 139 209 0
> 			OUTLINECOLOR 110 110 110
> 			EXPRESSION "1"
> 			NAME "Emphasizing Mitigation"
> 			SYMBOL 0
>   	END
>   	CLASS
> 			COLOR 255 255 0
> 			OUTLINECOLOR 110 110 110
> 			EXPRESSION "2"
> 			NAME "Emphasizing Response"
> 			SYMBOL 0
>   	END
>   	CLASS
> 			COLOR 255 128 0
> 			OUTLINECOLOR 110 110 110
> 			EXPRESSION "3"
> 			NAME "Emphasizing Disaster"
> 			SYMBOL 0
>   	END
>   	CLASS
> 			COLOR 255 0 0
> 			OUTLINECOLOR 110 110 110
> 			EXPRESSION "4"
> 			NAME "Local Plans"
> 			SYMBOL 0
>   	END
>   END
> END
> END
> 
> The header and footer are the basic <map> tags described in the wiki,
> but with the map height and width set to the 500, 275 dimensions from
> the files. 
> 
> Here's the body template:
> <area shape="poly" coords="[shpxy precision=0 proj=image]"
> href="http://myserver/Resources/state.aspx?state=[State]"
> title="[State]" alt="[State]">
> 
>  and the call to the image layer (these are part of an ASP.NET 2.0 web
> page and added as part of an httprequest):
> 
> http://myserver/cgi-bin/mapserv.exe?map=/ms4w/apps/drmon/service/drought
> plans_wms.map&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&LAYERS=droughtpla
> ns&WIDTH=500&HEIGHT=275&srs=EPSG:4326&styles=default&format=image/png&bb
> ox=-126,24,-66,50
> 
> I've got the extents and sizes set to the same 500, 275 dimensions
> everywhere, but the imagemap is still flattened (more like a box at 500
> x 200). Everything else works fine--all of the areas are defined, the
> links work,etc; it just isn't aligned properly. Is there something
> missing or something else going on here? 
> 
> Any help/ideas are greatly appreciated.
> Soren
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