[R-sig-Geo] gstat error
edzer.pebesma at uni-muenster.de
Sat Oct 15 17:11:29 CEST 2011
As you gave practically no information besides the error message, why
don't you simply try that.
Another possible cause is using a Gaussian variogram model with zero nugget.
On 10/15/2011 04:48 PM, Sandeep Patil wrote:
> I did check the data once again and did not find any such points .
> Should i remove points that are very close to each other i.e
> replace them with a single point ?
> On Sat, Oct 15, 2011 at 4:14 AM, Edzer Pebesma
> <edzer.pebesma at uni-muenster.de <mailto:edzer.pebesma at uni-muenster.de>>
> The most common cause is that you have multiple observations at
> single locations. You can use function zerodist to figure out
> whether this is the case.
> On 10/14/2011 06:11 PM, Sandeep Patil wrote:
> I am running a Kriging cross validation in Automap. I get the
> "chfactor.c", line 130: singular matrix in function LDLfactor()
> I did check out the troubleshooting part of gstat manual which
> suggested two possible reasons
> during simulation, when an observation falls almost exactly at a
> lation location. Solution: increase the value of zero
> when two observations occur at identical location occur and
> or average=0 was dened in a data denition. Solution: remove the
> noaverage, or add average=1
> Can someone elaborate what exactly is to be done in the above
> two options
> as i am finding it a bit cryptic.
> Edzer Pebesma
> Institute for Geoinformatics (ifgi), University of Münster
> Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
> 8333081, Fax: +49 251 8339763 <tel:%2B49%20251%208339763>
> <http://www.52north.org/geostatistics> e.pebesma at wwu.de
> <mailto:e.pebesma at wwu.de>
> R-sig-Geo mailing list
> R-sig-Geo at r-project.org <mailto:R-sig-Geo at r-project.org>
> Sandeep R Patil
> Graduate Student
> M.S (Hydrological Sciences)
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
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