[R-sig-Geo] gstat distance on a non-spherical Earth?

[Edzer Pebesma]

see:

https://svn.52north.org/svn/geostatistics/main/gstat/pkg/src/gcdist.c

On 08/11/2012 04:40 PM, Martin Ivanov wrote:
> Hello,
> 
> The interpolation routines of gstat use great circle distance in km as
> units for the distance between two  points of unprojected data. My
> question is, if the datum is not a sphere, how is distance in gstat defined
> for unprojected data? For example, how does gstat calculate the "great
> cirlce distance" between two points on the WGS84 datum?
> 
> Best regards,
> 
> 

-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de