[mapserver-users] convert projection from UTM to WGS84 using proj

Mon May 21 02:43:34 PDT 2012

Hi,

Ogr2ogr is your tool for converting shapefiles. There must be something wrong in the predefined EPSG parameteres.  Give projections as +proj strings and you will have a full control over what happens. An example about conversion from EPSG:2393 into EPSG:3067

ogr2ogr -f "ESRI Shapefile" -s_srs "+proj=tmerc +lat_0=0 +lon_0=27 +k=1 +x_0=3500000 +y_0=0 +ellps=intl +towgs84=-96.0617,-82.4278,-121.7535,4.80107,0.34543,-1.37646,1.4964 +units=m" -t_srs "+proj=utm +zone=35 +ellps=GRS80 +units=m +towgs84=0,0,0,0 +no_defs" target.shp original.shp

Mapserver takes the parameters from the text file named "epsg" and it is easy to edit by hand. However, ogr2ogr does not use that file. Therefore you did not see any difference after your edits.

-Jukka Rahkonen-

Murat Beyhan wrote:

> Hi,

> is cs2cs a tool for converting shape data and
are there any example for this purpose
actually I added +x_0=500000. to ogr2ogr command but doesn't cahaged the
result :(

On Fri, 2012-05-18 at 14:00 +0200, Jørn Vegard Røsnes wrote:
> Hi,
>
> I lost your previous email, so this is just by memory.
> I'm not an projection expert, but here we go :-)
>
> Regarding 3dg offset:
> In your .prj file there is an false easting=500000, so maybe it helps adding +x_0=500000.
> http://proj.maptools.org/gen_parms.html
> Se also +towgs84 in the same link and .prj file, and adjust accordingly.
>
> Maybe a shot in the dark because 3dg = 333958,33m (40 075,017km / 360dg).
> I think you're near the solution.
>
> See also
> http://spatialreference.org/
> http://spatialreference.org/ref/epsg/4230/
>
> kind regards
> Jørn-Vegard Røsnes
>
> ----- Original Message -----
> > From: "Jørn Vegard Røsnes" <jorn at spacetec.no>
> > To: "Murat Beyhan" <beyhan at deprem.gov.tr>
> > Cc: "mapserver-users" <mapserver-users at lists.osgeo.org>
> > Sent: Wednesday, 16 May, 2012 11:21:22 AM
> > Subject: Re: [mapserver-users] convert projection from UTM to WGS84 using proj
> >
> > Hi,
> > maybe something like this:
> >
> > ogr2ogr -s_srs epsg:4230 -t_srs epsg:4326  <dest shapefile> <source
> > shapefile>
> >
> > http://www.gdal.org/ogr2ogr.html
> >
> > kind regards
> > Jørn-Vegard Røsnes
> >
> > ----- Original Message -----
> > > From: "Murat Beyhan" <beyhan at deprem.gov.tr>
> > > To: "mapserver-users" <mapserver-users at lists.osgeo.org>
> > > Sent: Wednesday, 16 May, 2012 10:41:39 AM
> > > Subject: [mapserver-users] convert projection from UTM to WGS84
> > > using proj
> > >
> > > Dear friends,
> > > I'm sorry, I'm not good at GIS applications but I wondering about
> > > conversion between various projection or datum of the data files.
> > >
> > > data.shp data.shx data.dbf and data.prj files are available.
> > >
> > > shpdump data.shp gives following
> > >
> > > Shape:0 (ArcZ)  nVertices=4, nParts=1
> > >   Bounds:(  513275.786, 4006041.761, 0, 0)
> > >       to (  513345.812, 4006078.182, 0, 0)
> > >      (  513275.786, 4006078.182, 0, 0) Ring
> > >      (  513301.130, 4006064.906, 0, 0)
> > >      (  513321.636, 4006053.249, 0, 0)
> > >      (  513345.812, 4006041.761, 0, 0)
> > > ...
> > >
> > >
> > >
> > >
> > >
> > > data.prj as follows
> > >
> > > PROJCS["(UTM)Universal Transvers Merkator 3�",GEOGCS["EUROPEAN
> > > 1950",DATUM["European_Datum_1950",SPHEROID["International",6378388.00000000,297.00000000],
> > > TOWGS84[-87.00000000,-98.00000000,-121.00000000,0.00000000,0.00000000,0.00000000,0.00000000]],
> > > PRIMEM["Greenwich",0.00000000],UNIT["Degree",0.01745329],AUTHORITY["EPSG","4230"]],PROJECTION["TRANSVERSE_MERCATOR"],
> > > PARAMETER["SCALE_FACTOR",1.00000000],PARAMETER["CENTRAL_MERIDIAN",36.00000000],PARAMETER["LATITUDE_OF_ORIGIN",0.00000000],
> > > PARAMETER["FALSE_EASTING",500000.00000000],PARAMETER["FALSE_NORTHING",0.00000000],UNIT["meter",1.00000000]]
> > >
> > >
> > > using these data How to convert a file which is created using
> > > european_datum_1950 to WGS84 (World Geodetic System 1984)
> > > or where I have to start to understand these method of applications
> > > using PROJ4.
> > > Thanks
> > > muratB
> > >
> > >
> > > --
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> > > _______________________________________________
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> > >
> >
>
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Murat BEYHAN

Jeofizik Y.Müh.
T.C. Başbakanlık
Afet ve Acil Durum Yönetimi Başkanlığı
Deprem Dairesi Başkanlığı
Eskişehir Yolu 12. Km.
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Tel: 312 2872680-1556
email:beyhan at deprem.gov.tr

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