Stacey,
You should not need to use cs2cs - pretty much the same capabilities
are available from the ogr2ogr command line. What command are you
using now? And what version of GDAL/OGR? With modern versions the
following command should work well:
ogr2ogr -s_srs EPSG:3857 -t_srs EPSG:4326 out.shp in.shp
EPSG:3857 should evaluate to the following PROJ.4 string.
+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0
+x_0=0.0 +y_0=0 +k=1.0 +units=m
+nadgrids=@null +wktext +no_defs
Adding " --debug on " to the commandline may be helpful to
confirm the coordinate system strings being used internally.
Best regards,
On Wed, Sep 14, 2011 at 11:11 PM, Stacy Supak <sksu...@ncsu.edu> wrote:
> Hi community,
>
> Is there a way to add a datum shift parameter to a reprojected shp in an
> ogr2ogr call?
> I am using ogr2ogr to extract a shp from a postgis database and within the
> command I am reprojecting features from google Mercator to EPSG 4326. In the
> process of going from a spherical coordinate system to an elliptical one,
> the latitude of the shp is shifted north by .18 degrees. I was informed by
> a knowledgable member of the listserve that cs2cs could solve this problem,
> but can this command work on vector data or just coordinates? If it is
> possible to use cs2cs on a shp, do I simply run the command immediately
> after the ogr2ogr command?
> Thanks,
> Stacy
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Software Developer
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