map EXTENT

Wed Aug 25 17:22:13 EDT 2004

That did it. The mapserver documentation states that I
should be able to leave the EXTENT attribute emepty
and it will extrapolate one. However when I try this
mapserver throws an error: "Warning: [MapServer
Error]: msCalculateScale(): Invalid image extent,
minx=-1.000000, miny=-1.000000, maxx=-1.000000,
maxy=-1.000000. in ...". Is there and available work
around? I'm currently using Mapserver 4.2.2, PHP4.3.8
on Win XP and IIS.

Thank you very much,
Jacob

--- David Fawcett <David.Fawcett at state.mn.us> wrote:

> Jacob, I believe that the reason that the image is
> small is that you are
> telling it to be small.
>
> My guess is that your EXTENT for the MAP file is in
> decimal degrees,
> but you specify UNITS as meters.  In other words,
> you have specified an
> extent of about 13 by 11 meters!
>
> Comment out your UNITS line and see what happens.
>
> David.
>
>
>
> David J. Fawcett
> MN Office of Environmental Assistance
>
> >>> Jacob Blankenship <jhblankenship at yahoo.com>
> 8/25/2004 4:08:39 PM
> >>>
> Thank you for pointing out ogrinfo.exe. I have a
> polygon shp file, for which ogrinfo is reporting the
> EXTENT as {-106.645 25.837 -93.508 36.500 }. When I
> add these to my map file and display the image, the
> map is off center and very small. Below are my map
> and
> html files.
>
> Thank you in advance,
> Jacob
>
> ** Map file
> MAP
>     NAME TEXAS
>     STATUS ON
>     SIZE 400 300
>     IMAGETYPE GIF
>     IMAGECOLOR 240 240 240
>     SHAPEPATH "C:\Inetpub\wwwroot\ShapeFiles\TX\"
>     UNITS METERS
>
> EXTENT -106 25 -93 36
>
>     WEB
>         IMAGEPATH "C:\Inetpub\wwwroot\Images\Tmp\"
>         IMAGEURL "C:\Inetpub\wwwroot\Images\Tmp\"
>     END
>
>         LAYER
>                 NAME "TX counties"
>                 TYPE POLYGON
>                 STATUS ON
>                 DATA "cty00"
>
>                 CLASS
>                         NAME "TX counties"
>                         OUTLINECOLOR 60 60 60
>                         COLOR 255 255 0
>                         SYMBOL 0
>                 END
>         END
>
> END
>
> ** HTML file
> <?php
> dl("php_mapscript_42.dll");
>
> $map_file="./texas.map";
> $map = ms_newMapObj($map_file);
>
> $image=$map->draw();
> $image_url=$image->saveWebImage();
>
> ?>
>  <HTML>
>  <HEAD>
>  <TITLE>US state boundaries</TITLE>
>  </HEAD>
>  <BODY>
>         $nMinX = <?php echo ( $map->extent->minx );
> ?><br>
>         $nMinY = <?php echo ( $map->extent->miny );
> ?><br>
>         $nMaxX = <?php echo ( $map->extent->maxx );
> ?><br>
>         $nMaxY = <?php echo ( $map->extent->maxy );
> ?><br>
>         <img src="<?php echo $image_url?>">
>  </BODY>
> </html>
>
>
>
> --- Brant Anderson <brant at MUDLABS.COM> wrote:
>
> > Hi Oliver,
> >
> > There is a tool called 'ogrinfo' included with the
> > GDAL package. It is
> > very handy.
> >
> > To get a summary of 'dlgstlndoug.shp' I would
> type:
> > ogrinfo dlgstlndoug.shp dlgstlndoug -so
> >
> > The output would be:
> > INFO: Open of `dlgstlndoug.shp'
> > using driver `ESRI Shapefile' successful.
> >
> > Layer name: dlgstlndoug
> > Geometry: Line String
> > Feature Count: 403
> > Extent: (285509.105030, 5069677.370139) -
> > (334172.948552,
> > 5109545.047051)  <-- This is the EXTENT value
> (minx,
> > miny) - (maxx, maxy)
> > Layer SRS WKT:
> > (unknown)
> > FNODE_: Integer (9.0)
> > TNODE_: Integer (9.0)
> > LPOLY_: Integer (9.0)
> > RPOLY_: Integer (9.0)
> > LENGTH: Real (19.11)
> > DLGSTLNDOU: Integer (9.0)
> > DLGSTLND_1: Integer (9.0)
> > USCLASS: Integer (6.0)
> > FLOW: Integer (1.0)
> > S1: Real (6.1)
> > S2: Real (6.1)
> > S3: Real (6.1)
> > S4: Real (6.1)
> > S5: Real (6.1)
> > S6: Real (6.1)
> > S7: Real (6.1)
> > S8: Real (6.1)
> > S9: Real (6.1)
> > S10: Real (6.1)
> > ZONE: String (5.0)
> > TROUT: String (2.0)
> > WSR: String (1.0)
> > PWI: String (1.0)
> > STREAM__: String (60.0)
> > UNSPLIT_IT: String (77.0)
> >
> >
> > Hope that helps!
> >
> > Brant Anderson
> >
> >
> >
> > Oliver Ishmael wrote:
> >
> > > Hi Guys,
> > >
> > > How do i find out the EXTENT of my map?
> > >
> > > Any help greatly appreciated!
> > >
> > > Cheers
> > > Oliver Ishmael
> > >
> > >
> >
>
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