mapserv not following extents?

[Ed McNierney]

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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