How to interpret variogram

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How to interpret variogram

aoygeo
I'm a very new Geostatistics. I'm now trying to interpret the variogram graph. I use variogram to study spatial variability in Salt affected soil in Northeast thailand.The variogram graph we have to fix nugget sill and range in ILWIS but How can I fit the variogram in my data.If I can fit my variogram what is the nugget, sill and range? for example if the nugget is 0 or 5 what does it mean?  sill 20 or 100 what does it mean? range 5 or 500 what does it mean? please recommend me about this problem
Thank you in advance
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Re: How to interpret variogram

Daniel Nüst - 52N
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Am 30.11.2011 17:48, schrieb aoygeo:
> I'm a very new Geostatistics. I'm now trying to interpret the variogram
> graph. I use variogram to study spatial variability in Salt affected soil in
> Northeast thailand.The variogram graph we have to fix nugget sill and range
> in ILWIS but How can I fit the variogram in my data.If I can fit my
> variogram what is the nugget, sill and range? for example if the nugget is 0
> or 5 what does it mean?  sill 20 or 100 what does it mean? range 5 or 500
> what does it mean? please recommend me about this problem

There are more experienced statistitcians on the list, so I expect
you'll get some more advice soon. Until then, maybe the explanation of
terms can help you a little bit:

http://en.wikipedia.org/wiki/Variogram#Variogram_parameters

HTH,
Daniel

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Re: How to interpret variogram

Paul Hiemstra-2
On 12/01/2011 01:19 PM, Daniel Nüst wrote:

> Am 30.11.2011 17:48, schrieb aoygeo:
>> I'm a very new Geostatistics. I'm now trying to interpret the variogram
>> graph. I use variogram to study spatial variability in Salt affected soil in
>> Northeast thailand.The variogram graph we have to fix nugget sill and range
>> in ILWIS but How can I fit the variogram in my data.If I can fit my
>> variogram what is the nugget, sill and range? for example if the nugget is 0
>> or 5 what does it mean?  sill 20 or 100 what does it mean? range 5 or 500
>> what does it mean? please recommend me about this problem
> There are more experienced statistitcians on the list, so I expect
> you'll get some more advice soon. Until then, maybe the explanation of
> terms can help you a little bit:
>
> http://en.wikipedia.org/wiki/Variogram#Variogram_parameters
>
> HTH,
> Daniel
>
The link that Daniel provided provides an nice introduction to the
variogram. However, I would recommend you pick up a (geo)statistics text
book and read that. This kind of book offers a better description than
the wiki page, and offers more context. Some good textbooks are:

- Plane answers to complex questions, Christensen (very math heavy, no
real focus on variograms as such, more on linear models)
- Applied spatial data analysis with R, Pebesma and others (includes a
section on geostatistics)
- Principles of geographical information systems, Burrough and McDonnel
(has a low level introduction of geostats, not the most accurate in
terms of equations though)

As for some self promotion, earlier this year I wrote a report on
interpolation of evaporation. This report includes a section which
introduces the interpolation techniques used (kriging, idw, etc), this
might prove to be insightfull for you (and it is freely available :)).
You can find the report here:

http://www.numbertheory.nl/files/report_evap.pdf

regards,
Paul

--
Paul Hiemstra, Ph.D.
Global Climate Division
Royal Netherlands Meteorological Institute (KNMI)
Wilhelminalaan 10 | 3732 GK | De Bilt | Kamer B 3.39
P.O. Box 201 | 3730 AE | De Bilt
tel: +31 30 2206 494

http://intamap.geo.uu.nl/~paul
http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770

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Re: How to interpret variogram

aoygeo
Thank you very much for your informations.I'll try to understand it now ^^
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