mapserv not following extents?

[Kelly Koehn]

Ed:

Thanks for the response.  I feel kind of stupid now for not realizing my 
coordinates were wrong :)  After some reworking of the extent values I 
finally achieved what I wanted.

Thanks!

Kelly




>
>Kelly -
>
>You're asking (in the mapfile) for a square image (400x400 pixels) with
>a decidedly NON-square extent - 5.2 degrees by 0.75 degrees.  You can't
>do both at the same time, so MapServer is honoring the larger extent
>(the X dimension) and extending the smaller extent (the Y dimension) in
>order to fill the size of the image you requested.  MapServer uses this
>algorithm to ensure that you always get the geographic extent you
>requested, and gives you more if needed.
>
>What output do you really want?  You're asking for a map of an area
>that's 7 times wider than it is tall.  Is that the area you want, or do
>you want something different?
>
>	- 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: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU] On
>Behalf Of Kelly Koehn
>Sent: Thursday, May 18, 2006 10:48 AM
>To: MAPSERVER-USERS at LISTS.UMN.EDU
>Subject: [UMN_MAPSERVER-USERS] mapserv not following extents?
>
>I've been working with the USGS Counties and States maps (located at
>nationalatlas.gov) and the GIS maps from the NOAA and I've been running
>into a stumbling block.  I've been able to get the maps to display but
>it seems that the mapserv cgi app only pays attention to one of the
>extents.
>
>I'll copy my map file below but for my example use the following line:
>     EXTENT          -100.05 37.1 -94.85 37.85
>
>It seems to fit the -100.05 and -94.85 just fine on the map and that
>gives me the coordinates I need on the X axis but it never seems to
>follow on the Y-axis.  Its like it tries to create something
>porportional.  What the end result is a map that is squished from top to
>bottom. (see at
>http://www.aspiredillusion.com/cgi-bin/mapserv?map=/nexrad/map/nexrad.ma
>p&mode=map
>)
>
>Has anyone else experienced this or know of a way around it?  Here is
>the -v info from mapserv:
>MapServer version 4.9 OUTPUT=GIF OUTPUT=PNG OUTPUT=JPEG OUTPUT=WBMP
>OUTPUT=SWF OUTPUT=SVG SUPPORTS=PROJ SUPPORTS=FREETYPE
>SUPPORTS=WMS_SERVER SUPPORTS=WMS_CLIENT SUPPORTS=WFS_SERVER
>SUPPORTS=WFS_CLIENT SUPPORTS=WCS_SERVER SUPPORTS=GEOS INPUT=EPPL7
>INPUT=POSTGIS INPUT=OGR INPUT=GDAL INPUT=SHAPEFILE DEBUG=MSDEBUG
>
>
>Thanks
>Kelly Koehn
>
>
>
>---------
>
>Copy of nexrad.map
>---
>MAP
>         IMAGETYPE       GIF
>         SIZE            400 400
>         SHAPEPATH       "/nexrad/map"
>         TRANSPARENT     ON
>         UNITS           DD
>         EXTENT          -100.05 37.1 -94.85 37.85
>         FONTSET         "font.set"
>
>         LAYER
>                 NAME    c100000jan2902
>                 DATA    c100000jan2902
>                 STATUS  DEFAULT
>                 TYPE    POLYGON
>                 #FILTERITEM     county
>                 #FILTER "Sedgwick County"
>                 LABELITEM "COUNTYNAME"
>                 CLASS
>                         NAME    "US Counties"
>                         OUTLINECOLOR    0 0 0
>                         LABEL
>                                 TYPE truetype
>                                 FONT arial
>
>                                 SIZE 6
>                                 ANTIALIAS TRUE
>                                 COLOR 255 0 0
>                                 OUTLINECOLOR 255 255 255
>                                 ANGLE 0
>                                 PARTIALS false
>                         END
>                 END
>         END
>END
>
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