[OSRS-PROJ] geod API?

[Gerald I. Evenden]

I have to admit that when I put *geod* into PROJ.4 it was kind of a
throwaway
item.  Lot'sa people wanted geodesic distances to I included it.  The
algorithm
used is not very good but good to a cm or two at most large distances.
Also,
the algorithm is a horror mathematically.

I recommend the geodesic procedure available from the Nat'l Geodetic Survey
as I believe it to be more accurate and certainly cleaner mathematically
(although it is recursive).  They have a FORTRAN version which very cleanly
converts to C with f2c.
__________________________________________________
Jerry Evenden and the Low Riders, Katie and  Daisy May
gevenden at capecod.net  http://www.capecod.net/~gevenden
----- Original Message -----
From: David L Smith <david.l.smith at larc.nasa.gov>
To: <osrs-proj at remotesensing.org>
Sent: Tuesday, May 02, 2000 10:43 AM
Subject: [OSRS-PROJ] geod API?


> Has anyone wrapped the geodetic distance calculations in geod with an API?
> I'm just starting to use the PROJ system, and can't find any .ps or .pdf
> documentation that mentions the geod program; and while the PROJ library
is
> doing a great job, I'm also interested in the ellipsoidal geodetic
distance
> calculation that geod uses.
>
> Thanks much,
> -dave
>
> David L. Smith
>   e-mail: david.l.smith at larc.nasa.gov

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