[Proj] Geod: I need a little guide

[Paul Selormey]

Thanks for the information. Yes, I thought it was a geoid-ellipsoid
conversion program.

Best regards,
Paul.

----- Original Message ----- 
From: "Gerald Evenden" <gerald.evenden at verizon.net>
To: <proj at remotesensing.org>
Sent: Monday, April 26, 2004 3:52 AM
Subject: Re: [Proj] Geod: I need a little guide


> As I have been informed that *geod* is the geodesic program I will make
> some comments:
> 
> 1) there is a geod.1 file giving a brief explanation of usage.
> 
> 2) ellipsoid parameters are selected in the same manner as for program
>      *proj*.  For example, +ellps=besset, or +a=, +es=, +rf=, +R=, etc.
> 
> 3) "forward" of "direct" input consists of lon, lat, azimuth and 
> distance and
>      the result is the lon-lat of the point and back azimuth.
> 
> 4) Inverse input consists of lon_1, lat_1, lon_2, lat_2 and the distance
>     between the points is returned as well as the azimuth from point 1 
> and
>     back azimuth from point 2.  Execute geod as "invgeod" or "geod -I 
> ..."
> 
> 5) There are a couple of other options.
> 
> If you could be more detailed in your needs I could perhaps suggest
> an appropriate usage script.
> 
> Note: the name "geod" is short for geodesic which is synonymous with
> "great circle" or shortest distance between two points on the sphere or
> ellipsoid.  The request seems related to the geoid---a completely 
> different
> animal.
> 
> On Apr 25, 2004, at 6:56 AM, Paul Selormey wrote:
> 
> > Hello All,
> > I need a little guide on the geod program, even the command options.
> >
> > In particular, any guide on the implementations? Is it based the
> > WGS84 EGM96 model?
> >
> > Anyone knows the EGM96 binary file format in Geotrans?
> > (the "egm96.grd" file) - I managed some format after reading
> > the Geoid conversion sources, but do not know if it is the 
> > complete/true
> > picture.
> >
> > Best regards,
> > Paul.
> _____________________________________
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> 
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