[Mapserver-users] Can't seem to get the projection correct
Ed McNierney
ed at topozone.com
Tue Feb 18 09:12:53 PST 2003
Daniel -
I'm not a MapInfo user, but is MapInfo telling you the projection of the
output image you're viewing, or the projection of the input data you're
using?
- Ed
-----Original Message-----
From: Martin, Daniel [mailto:DMartin at erac.com]
Sent: Tuesday, February 18, 2003 11:52 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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