[R-sig-Geo] GSTAT - singular in meters not km

[Edzer Pebesma]

Hi Zev, it is hard to see what happens without seeing your data or R 
commands.

Is it possible that you passed an unrealistic value for the range 
parameter, as starting value for the variogram model argument of 
fit.variogram?
--
Edzer

Zev Ross wrote:
> Hi All,
>
> I'm fitting variograms in GSTAT with fit.variogram and I was surprised 
> to find that all my fits were singular. I experimented with converting 
> the data to unprojected data (decimal degrees) and with dividing my X 
> and Y coordinates, which are in meters, by 1000 (to get KM). In both 
> cases the fitting procedure worked with no singularity. Based on the 
> numbers of pairs the bins appeared to be about the same so it appears 
> to be a matter of the coordinates themselves.
>
> I'd prefer not to have to convert the coordinates back and forth 
> between meters and KM, any suggestions?
>
> Zev
>
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-- 
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.springer.com/978-0-387-78170-9 e.pebesma at wwu.de