Displacement from coordinates

[N M]

Hi Ed,

I didn't used WGS84 first but I recalculate all my points again with this 
datum. Now displacement of points is greater than before they are more left 
and more down than before.

I think that original map from Institut Cartografic de Catalunya have the 
wrong UTM coordinates. I'll will try to obtain coordinates from the correct 
containers that appear in the map.

Do you know where can I obtain another map to compare coordinates?

Thank you.

Nuri


>From: "Ed McNierney" <ed at topozone.com>
>To: "N M" <mapserver at hotmail.com>,<MAPSERVER-USERS at LISTS.UMN.EDU>
>Subject: RE: [UMN_MAPSERVER-USERS] Displacement from coordinates
>Date: Mon, 26 Sep 2005 09:09:22 -0400
>
>Nuri -
>
>I used the US National Geodetic Survey's online calculator at 
>http://www.ngs.noaa.gov/cgi-bin/utm_getut.prl and got different results for 
>your first pair:
>
>Northing: 4677368.307
>Easting:   494970.715
>Zone:		   31
>
>The only datum choices are "NAD83" and "NAD27", and I got those results by 
>choosing NAD83.
>
>However, I also got exactly the same results using YOUR calculator and 
>selecting the WGS84 datum.  Are you selecting the correct datum?  I 
>selected WGS84 at the top, entered the first pair of coordinates, and got 
>the answer above, not your answer below.
>
>Are you using the calculator correctly?
>
>	- Ed
>
>Ed McNierney
>President and Chief Mapmaker
>TopoZone.com / Maps a la carte, Inc.
>73 Princeton Street, Suite 305
>North Chelmsford, MA  01863
>Phone: +1 (978) 251-4242
>Fax: +1 (978) 251-1396
>ed at topozone.com
>
>-----Original Message-----
>From: N M [mailto:mapserver at hotmail.com]
>Sent: Monday, September 26, 2005 5:28 AM
>To: Ed McNierney; MAPSERVER-USERS at LISTS.UMN.EDU
>Subject: Re: [UMN_MAPSERVER-USERS] Displacement from coordinates
>
>Hi,
>
>To convert coordinates I use for example:
>
>http://www.icc.es/geotex/egeoutmcatala2.html (a geodesic calculator)
>
>An example of GPS coordinates and results are:
>
>42º 14' 54.568" - 4677448.415
>2º 56' 20.526" - 494971.3073
>
>42º 14' 58.548" - 4677573.222
>2º 57' 37.05" - 496724.1829
>
>The correct containers are the little yellow squares and displaced are de 
>blue ones:
>
>http://www.nusvirtual.com/selectiva
>
>The coordinates are form the first two containers in top rigth side of the 
>map. I think you are right because I tried to place manually the containers 
>and coordinates are displaced, so, how could I convert correctly GPS 
>coordinates to UTM?
>
>Thank you.
>
>Nuri
>
> >From: Ed McNierney <ed at TOPOZONE.COM>
> >Reply-To: Ed McNierney <ed at TOPOZONE.COM>
> >To: MAPSERVER-USERS at LISTS.UMN.EDU
> >Subject: Re: [UMN_MAPSERVER-USERS] Displacement from coordinates
> >Date: Fri, 23 Sep 2005 19:38:54 -0400
> >
> >Nuri -
> >
> >I agree with Steve - how exactly did you convert your GPS coordinates
> >to UTM coordinates?  What datum did you use, and what datum does the
> >rest of the map use?
> >
> >If you can give us a sample of the "GPS coordinates" and the UTM
> >output, we can check the conversion.
> >
> >	- Ed
> >
> >Ed McNierney
> >President and Chief Mapmaker
> >TopoZone.com / Maps a la carte, Inc.
> >73 Princeton Street, Suite 305
> >North Chelmsford, MA  01863
> >Phone: +1 (978) 251-4242
> >Fax: +1 (978) 251-1396
> >ed at topozone.com
> >
> >-----Original Message-----
> >From: UMN MapServer Users List [mailto:MAPSERVER-USERS at LISTS.UMN.EDU]
> >On Behalf Of Steve Lime
> >Sent: Friday, September 23, 2005 3:58 PM
> >To: MAPSERVER-USERS at LISTS.UMN.EDU
> >Subject: Re: [UMN_MAPSERVER-USERS] Displacement from coordinates
> >
> >I doubt it's a mapserver problem, most likely a problem the conversion
> >some place, or in the georeferencing of the map.
> >
> >Steve
> >
> > >>> SUBSCRIBE MAPSERVER-USERS Nuri <mapserver at HOTMAIL.COM> 09/23/05
> > >>> 7:55
> >
> > >>> AM >>>
> >Hi,
> >
> >I created my own map and I inserted my coodinates. First of all I
> >translated my GPS coordinates to UTM coordinates and then to pixels to
> >insert it in a data base to place several symbols in my my.
> >
> >Al symbols have a displacement. As you can see in
> >www.nusvirtual.com/selectiva (click link to see de map) small yellow
> >rectangles are in the correct position but blue symbols are the
> >displaced ones.
> >
> >UTM coordinates are completely correct, I placed it manually over the
> >map but when mapserver place them they are incorrect.
> >
> >Someone could indicate me why appears this displacement?
> >
> >Thank you.
> >
> >Nuri
>
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