[Mapserver-users] Can't seem to get the projection correct

Lowther, David W dlowther at ou.edu
Tue Feb 18 08:54:14 PST 2003 

This sounds like it might be the issue that another person had with PROJ and
datum shifts not too long ago. You might search the archives... Like some
files were missing that PROJ needed.

> -----Original Message-----
> From: Martin, Daniel [mailto:DMartin at erac.com] 
> Sent: Tuesday, February 18, 2003 10:52 AM
> To: 'Ed McNierney'; mapserver-users at lists.gis.umn.edu
> Subject: RE: [Mapserver-users] Can't seem to get the 
> projection correct
> 
> 
> Well, perhaps MapInfo is lying to me, but it says the 
> projection I am after
> *is* latlong.  It says:  "Latitude/Longitude (NAD 27 for the 
> Continental US)"
> 
> I've tried NAD 27:
>     proj=latlong
>     ellps=clrk66 
>     datum=NAD27 
>     no_defs
> 
> But when I do, my map simply disappears!
> 
> Thanks,
> Dan Martin
> 
> > -----Original Message-----
> > From: Ed McNierney [mailto:ed at topozone.com]
> > Sent: Tuesday, February 18, 2003 10:42 AM
> > To: Martin, Daniel; mapserver-users at lists.gis.umn.edu
> > Subject: RE: [Mapserver-users] Can't seem to get the
> > projection correct
> > 
> > 
> > Daniel -
> > 
> > You need to know what projection you're trying to emulate.  
> It is VERY 
> > unlikely that any map you find in an atlas is using the 
> "geographic" 
> > projection you're using in your map.  The example you show from 
> > MapInfo
> > *might* be a Mercator projection (which you might commonly find in 
> > atlases, too), which STRETCHES areas near the poles (i.e. Greenland 
> > isn't nearly as big as most people think).  That's why your 
> > unprojected data might appear squished by comparison.
> > 
> > 	- Ed
> > 
> > Ed McNierney
> > President and Chief Mapmaker
> > TopoZone.com / Maps a la carte, Inc.
> > 73 Princeton Street, Suite 305
> > North Chelmsford, MA  01863
> > Phone: (978) 251-4242  Fax: (978) 251-1396
> > ed at topozone.com
> > 
> > 
> > -----Original Message-----
> > From: Martin, Daniel [mailto:DMartin at erac.com]
> > Sent: Tuesday, February 18, 2003 11:28 AM
> > To: mapserver-users at lists.gis.umn.edu
> > Subject: RE: [Mapserver-users] Can't seem to get the 
> > projection correct
> > 
> > David,
> > Thanks for your suggestion.  I tried it but it's not quite what I'm 
> > looking for.  I want horizontal lines of latitude, as I 
> have now.  I'd 
> > just rather
> > have the vertical less squished.
> > 
> > All,
> > I've attached a map displaying identical data in MapInfo and
> > MapServer,
> > with
> > both applications' projection set to latlong.  In comparison you can
> > clearly
> > see that the MapServer output is vertically squished.
> > 
> > This isn't limited to MapInfo.  Nearly any map I can find of a 
> > particular area from any source (Mapquest, an atlas, anywhere) is 
> > similar to the MapInfo view, and the MapServer view looks 
> "squished", 
> > for lack of a better
> > term.
> > 
> > I've attached a map file below.
> > 
> > I appreciate the help guys,
> > Dan Martin
> > 
> > #
> > # Start of map file
> > #
> > NAME NorthAmerica
> > STATUS ON
> > SIZE 800 600
> > UNITS dd
> > IMAGECOLOR 255 255 255
> > FONTSET "..\fonts\fontset.txt"
> > SYMBOLSET "..\symbols\symbolSet.txt"
> > IMAGETYPE PNG
> > 
> > #
> > # Projection definition, consult the PROJ.4 documentation for
> > parameter
> > discussion
> > #
> > PROJECTION
> > 		proj=latlong
> > END
> > 
> > #
> > # Start of web interface definition (including WMS enabling 
> metadata) 
> > # WEB
> >   TEMPLATE ../Clients/rosaClient.html
> >   MINSCALE 1000
> >   IMAGEPATH "\inetpub\wwwroot\temp\"
> >   IMAGEURL "/temp/"
> > 	HEADER "../queryTemplates/query_head.html"
> > 	FOOTER "../queryTemplates/query_foot.html"
> > 	EMPTY "../MapServer/noRecords.html"
> > END
> > 
> > QUERYMAP
> >   SIZE 200 200
> >   STATUS ON
> >   STYLE HILITE
> >   COLOR 255 255 0
> > END
> > 
> > 
> > # Start of reference map
> > 
> > REFERENCE
> >   IMAGE ../referenceImages/us-reference.gif
> >   EXTENT -124.986016 24.403641 -66.490832 68.268767
> >   SIZE 160 120
> >   STATUS ON
> >   COLOR -1 -1 -1
> >   OUTLINECOLOR 255 0 0
> > END
> > 
> > 
> > # LEGEND object
> > LEGEND
> >    STATUS off		 
> >    KEYSIZE 40 16
> > 	 OUTLINECOLOR -1 -1 -1
> >    TEMPLATE "../legendTemplates/checkBox_legend.html"
> > END
> > 
> > #
> > # Start of scalebar
> > #
> > SCALEBAR
> >   IMAGECOLOR 0 125 90
> > 	BACKGROUNDCOLOR 150 230 150
> > 	OUTLINECOLOR 255 255 255
> >   LABEL
> >     COLOR 255 255 255
> >     SIZE large
> >   END
> >   STYLE 0
> >   SIZE 200 10
> >   COLOR 255 255 255
> >   UNITS miles
> >   INTERVALS 3
> >   TRANSPARENT TRUE
> >   STATUS TRUE
> > END
> > 
> > # Start of layer definitions
> > #
> > LAYER
> >   NAME "USA"
> > 
> >   PROJECTION
> >     "proj=latlong"
> >   END
> > 
> >   CONNECTIONTYPE OGR
> >   CONNECTION "\GISData\Namerca\USA\Usa_Maps\USA.TAB"
> > 
> > 	STATUS DEFAULT
> >   TYPE POLYGON
> >   CLASS
> >     COLOR 225 225 185
> >     OUTLINECOLOR -1 -1 -1
> >   END
> > END
> > 
> > LAYER
> >   NAME "Canada"
> > 
> >   PROJECTION
> >     "proj=latlong"
> >   END
> > 
> >   CONNECTIONTYPE OGR
> >   CONNECTION "\GISData\Namerca\Canada\Canada.TAB"
> > 	STATUS DEFAULT
> > 
> >   TYPE POLYGON
> > 
> >   CLASS
> >     COLOR 225 225 185
> >   END
> > END
> > 
> > END
> > > -----Original Message-----
> > > From: Ed McNierney [mailto:ed at topozone.com]
> > > Sent: Tuesday, February 18, 2003 9:59 AM
> > > To: Martin, Daniel; mapserver-users at lists.gis.umn.edu
> > > Subject: RE: [Mapserver-users] Can't seem to get the
> > > projection correct
> > > 
> > > 
> > > Daniel -
> > > 
> > > Unfortunately <g>, the map looks just fine.  What were you
> > expecting?
> > > Do you have a sample of what a "geographic" projection of
> > > that area does
> > > look like?  Canada's going to get stretched quite a bit that way.
> > > 
> > > 	- Ed
> > > 
> > > Ed McNierney
> > > President and Chief Mapmaker
> > > TopoZone.com / Maps a la carte, Inc.
> > > 73 Princeton Street, Suite 305
> > > North Chelmsford, MA  01863
> > > Phone: (978) 251-4242  Fax: (978) 251-1396
> > > ed at topozone.com
> > > 
> > > 
> > > -----Original Message-----
> > > From: Martin, Daniel [mailto:DMartin at erac.com]
> > > Sent: Tuesday, February 18, 2003 10:51 AM
> > > To: mapserver-users at lists.gis.umn.edu
> > > Subject: [Mapserver-users] Can't seem to get the 
> projection correct
> > > 
> > > I've been playing with my projections for some time now, with no 
> > > success. I'm using entirely OGR data (MapInfo data to be exact).  
> > > All the data is
> > > in
> > > latlong.  No matter what I try, I end up with maps that are 
> > vertically
> > > challenged (squished).  See the attachment.
> > > 
> > > I'd appreciate any advice you can offer.
> > > 
> > > Thanks,
> > > Daniel Martin
> > > 
> > 
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