[GRASS5] Re: [GRASSweb-list]File radii.c

[John Gillette]

I don't know for sure, BUT:
on page http://www.mentorsoftwareinc.com/cc/gistips/TIPS0899.HTM
down where it says "Meridional Radius of Curvature" is the exact formula
out of "radii.c". Quote: "essentially, the radius of curvature, at a specific latitude ...".

See also http://williams.best.vwh.net/ellipsoid/node1.html which has a nice
picture showning the parametric latitude and phi, the geodetic latitude.  
On the next page,
http://williams.best.vwh.net/ellipsoid/node2.html, in equation 3, the 
Meridional Radius of Curvature shows up.

So, it looks like you are calculating the Meridional Radius of Curvature
as a function of GEODETIC LATITUDE.

John


> -----Original Message-----
> From: grass5-admin at grass.itc.it [mailto:grass5-admin at grass.itc.it]On
> Behalf Of Markus Neteler
> Sent: Friday, September 30, 2005 10:02 AM
> To: Helmut Kempelmann
> Cc: grass5 developers list
> Subject: [GRASS5] Re: [GRASSweb-list]File radii.c
> 
> 
> A FWD from Weblist:
> 
> On Mon, Sep 12, 2005 at 01:53:37PM +0200, Helmut Kempelmann wrote:
> > Dear Sirs,
> > 
> > I think, all "lon"s in the file "radii.c" should read as "lat".
> > 
> > 
> > regards,
> >  Kempelmann
> > 
> > Elektroniksystem- und Logistik GmbH
> > Dep VT - I, Dr. Helmut Kempelmann
> > Einsteinstrasse 174
> > D-81675 Muenchen
> > Tel +49 (89) 9216 - 24 94
> > Fax +49 (89) 9216 - 16 - 24 94
> > e-mail Helmut.Kempelmann at esg.de
> > 
> 
> lib/gis/radii.c
> 
> can anyone confirm this?
> 
> Markus
> 
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