[R-sig-Geo] Weird experimental 3D spatiotemporal variogram

[Edzer Pebesma]

Piero,

from the orientation of your graph, I could not see very well what
happens at zero-time, zero-space lag.

Did you compute a pure-time variogram, i.e. with zero space distance?
This one should have a missing zero-value, unless you have duplicate
measurements.

On 01/10/2013 03:20 PM, Piero Campalani wrote:
> Dear list,
> 
> I am predicting PM measurements on a spatiotemporal grid with monthly
> intervals in time.
> At modeling time, I am looking at the experimental 3D variograms
> (`wireframes`) but I see that weird decreasing behavior in time (see
> wireframes_2008-1.eps for January 2008): there is a peak at 0 time lags,
> then correlation in time is much higher over different days.
> How can I interpret such variogram?
> Would it mean that there is a very high spatial variability for values on
> the same day, whereas temporal variability is significantly lower?
> 
> Thanks for any hint,
> (I can provide implementation details in case of need)
> 
> Piero
> 
> 
> 
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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.52north.org/geostatistics      e.pebesma at wwu.de