What is the different between these variogram

classic Classic list List threaded Threaded
4 messages Options
Reply | Threaded
Open this post in threaded view
|

What is the different between these variogram

aoygeo
This post was updated on .
Hi

I'm PhD. student in Khon Kaen University,Thailand. I now to doing research in spatial variability in some important chemical properties of salt-affected soil in Thailand using geostatistics.I'm new for this knowledge In ILWIS.  I have some problem about variogram. I collected soil in grid sampling (5m in 25*25 grid) and I use semivariogram to analyse with the data. The problem is the semivariogram  looks strange.This is  variogram of my some data.it's didn't fit (figure b and c) with the empirical semivarigram.Is it possible to fit or not? what does it mean from this semivariogram?  and for figure a. the data fit with power model ,How can I calculate Nugget/sill to see the spatial correlation? because the parameter for this power model are nugget, slope and power . anybody can help me ? thank you ^^
Reply | Threaded
Open this post in threaded view
|

Re: What is the different between these variogram

Edzer Pebesma
Administrator
Hi,

I'm not familiar with the semivariogram functions in Ilwis. Figure b
looks worrying -- there seems to be no suggestion of spatial
correlation, so the one fitted might be true, but anything else (pure
nugget, no nugget) as well. Maybe you can vary the width or cutoff
distance settings?

For specialized help, you might want to try an Ilwis mailing list / forum.

Best regards,

On 12/29/2011 03:24 PM, aoygeo wrote:

> Hi
>
> I'm PhD. student in Khon Kaen University,Thailand. I now to doing research
> in spatial variability in some important chemical properties of
> salt-affected soil in Thailand using geostatistics.I'm new for this
> knowledge In ILWIS.  I have some problem about variogram. I collected soil
> in grid sampling (5m in 25*25 grid) and I use semivariogram to analyse with
> the data. The problem is the semivariogram  looks strange.This is  variogram
> of my some data.it's didn't fit (figure b and c) with the empirical
> semivarigram.Is it possible to fit or not? what does it mean from this
> semivariogram?  and for figure a. the data fit with power model ,How can I
> calculate Nugget/sill to see the spatial correlation? because the parameter
> for this power model are nugget, slope and power . anybody can help me ?
> thank you ^^
>
> --
> View this message in context: http://geostatistics.forum.52north.org/What-is-the-different-between-these-variogram-tp3618913p3618913.html
> Sent from the 52° North - Geostatistics Community Forum mailing list archive at Nabble.com.
> _______________________________________________
> Geostatistics mailing list
> [hidden email]
> http://list.52north.org/mailman/listinfo/geostatistics
> http://geostatistics.forum.52north.org

--
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      [hidden email]
_______________________________________________
Geostatistics mailing list
[hidden email]
http://list.52north.org/mailman/listinfo/geostatistics
http://geostatistics.forum.52north.org
Reply | Threaded
Open this post in threaded view
|

Re: What is the different between these variogram

aoygeo
Dear Sir

"vary the width or cutoff
distance settings" you mean that I have to try to vary width or cutoff the lag distance right?. but anyway I'll try an Ilwis mailing list / forum.Thank you very much sir.You give me a big help ^^.

Best regard,
Reply | Threaded
Open this post in threaded view
|

hs_123

hs_123
This post has NOT been accepted by the mailing list yet.
Get healthy life 番組名は「美味しい水にはワケがある 進化した飲料水"MCMのめぐみ"」「約100種類ものミネラルが凝縮された天然サプリメントMCMを天然水に溶かし込んだ「MCMのめぐみ」。新しい水の価値を求める人々の間で、今注目を集めている。この進化したボトルウォーター&ウォーターサーバー に、どんな秘密が隠されているのか。開発者や愛飲者の証言などによって、その秘密を解き明かしていく。」