[Proj] Can I convert the ellipsoids using Proj?

[Cleo Drakos]

Thanks Davide and all of you guys : Noel,  Jose, and Alain

All of you provided very nice response to my question.
>From yours kind support, my problem is now solved.
Thanks again.

cleo


On Wed, Aug 20, 2014 at 5:18 PM, Davide Cesari <dcesari at arpa.emr.it> wrote:

> On 20/08/2014 09:37, Cleo Drakos wrote:
> > Dear Noel and Alain
> >
> > Thanks for your nice answers.
> >
> > So, while calling the cs2cs, where can I input the lat, lon and
> elevation?
> >
> > cs2cs -f %.9f +a=6378136.30 +rf=298.257 +proj=latlong +towgs84=0,0,0 +to
> > +a=6378137 +rf=298.25722356 +proj=latlong +towgs84=0,0,0
> >
> > cleo
>
> Dear Cleo,
>         with the command line indicated above, lon lat and optional
> altitude
> should be provided in standard input, i.e. typed by keyboard; on linux
> and unix-like systems shell (and probably DOS command line as well), you
> can take standard input from a text file with the syntax:
>
> cs2cs ... < filenamewithlonandlat
>
> Alternatively, the cs2cs command can receive as an extra argument the
> name of a file containing the coordinates, I suggest you to experiment
> with all the variations. Notice that the order of the coordinate is lon
> lat, not lat lon, but there are switches to change this as well as other
> formal aspects of cs2cs behavior, please refer to the cs2cs/proj
> documentation.
>
>         Davide
> >
> >
> > On Wed, Aug 20, 2014 at 3:37 PM, Alain Orsoni <Alain.Orsoni at ign.fr
> > <mailto:Alain.Orsoni at ign.fr>> wrote:
> >
> >     Cleo,
> >
> >     If I understand correctly you have latitude, longitude, elevation
> >     (considered as heigth above ellipsoid) and geoid (considered as
> >     height above geoid).
> >     If so, you have to input only latitude longitude and elevation in
> >     proj4. Heigth above geoid remains the same whatever the ellipsoid
> >     you use, it is just the height of the geoid above the ellipsoid
> >     which changes when you change ellipsoid.
> >     The elevation above ellipsoid will change because of the change of
> >     ellipsoid dimensions.
> ...
>
>
> --
> ============================= Davide Cesari ============================
> Dott**(0.5) Davide Cesari
> ARPA-Emilia Romagna, Servizio IdroMeteoClima
> NWP modelling - Modellistica numerica previsionale
> Tel. +39 051525926
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