Talk:Variogram

Added Definition and Properties

I just added some concrete information to the page. It is still not really satisfying me. Boostat 00:04, 2 March 2007 (UTC)

Use in Optics and Image Processing

While researching contrast measurement as used in autofocus, I ran across this journal article mentioning variograms:

Variogram-based method for contrast measurement, Luis Miguel Sanchez-Brea, Francisco Jose Torcal-Milla, and Eusebio Bernabeu, Applied Optics, Vol. 46, Issue 22, pp. 5027-5033

Perhaps this might be something to integrate either into Variogram or Autofocus. This is my first encounter with the variogram so I don't know how it's applied in an image processing context.

SpareSimian 20:43, 12 July 2007 (UTC)

Add Chart

A graph of a variogram would ease its understanding (especially as far as efficiently conveying the range, sill, and nugget). I will try to put one up shortly, but if someone else already has a good example lying around (with range, sill, nugget marked), it would be copacetic if you could add it to this page. --Tekhnofiend (talk) 22:40, 10 March 2008 (UTC)

This page is only for those who want to know what the word means or who are proficient with geostatistics and can use the fomulas. For the the 95% of user, that see a variogram in an article and what to interpret it this article is of no use. — Preceding unsigned comment added by 77.0.245.187 (talk) 10:56, 16 May 2012 (UTC)

A mistake in the text

The factor 1/2 seems to be missed in the definition of the Empirical variogram —Preceding unsigned comment added by 87.68.57.32 (talk) 22:54, 3 January 2009 (UTC)

Hi,

Could you please confirm or tell us when our reservoir is affected by erosion (Unconformity Hercynian) I means some sub-reservoirs are completely eroded should I use only transformation and I keep the variogram anisotropic (as default for direction " major and minor" and range "in 03 directions major minor and vertical") see picture N1 and N2. Or default just for the eroded parts and I should identify the variogram (All values "direction and ranges") for the layers not affected the erosion (Unconformity Hercynian) see pictures N3.

[[File: ]]

[[File: ]]

[[File: ]]

Thanks in advance

email:sld_312@yahoo.fr  — Preceding unsigned comment added by Sld312 (talk • contribs) 13:34, 26 February 2011 (UTC) 

Property modeling

Hi,

Could you please confirm or tell us when our reservoir is affected by erosion (Unconformity Hercynian) I means some sub-reservoirs are completely eroded should I use only transformation and I keep the variogram anisotropic (as default for direction " major and minor" and range "in 03 directions major minor and vertical") see picture N1 and N2. Or default just for the eroded parts and I should identify the variogram (All values "direction and ranges") for the layers not affected the erosion (Unconformity Hercynian) see pictures N3.

[[File: ]]

[[File: ]]

[[File: ]]

Thanks in advance.

Please email me at sld_312@yahoo.fr — Preceding unsigned comment added by Sld312 (talk • contribs) 13:37, 26 February 2011 (UTC)

Use of English

As a biologist with a minor background in mathematics, I'd like to suggest someone edit this page so that it has a simple English introduction. I was trying to find "semivariogram" but found this perhaps excellent mathematical discussion, but a brief English introduction would be very helpful to me. I can't imagine a high school student gaining much from this page. Think encyclopedia. — Preceding unsigned comment added by Sedgehead (talk • contribs) 18:41, 14 June 2012 (UTC)

"Variogram," as well as "Semivariance" have been known as "structure function" in the turbulence-related literature. It was introduces in Kolmogorov's 1941 works [1,2] for processes and fields with "stationary increments" [1] A N. KOLMOGORODV ,Doklady Akad. Nauk SSSR, 30 (1941) 229 [2] A N. KOLMOGORODV ,Doklady Akad. Nauk SSSR, 32 (1941) 19 — Preceding unsigned comment added by 140.172.33.11 (talk) 22:40, 13 February 2013 (UTC)

Structure function supersedes Variogram and Semivariance

"Variogram," as well as "Semivariance" have been known as "structure function" in the turbulence-related literature. It was introduces in Kolmogorov's 1941 works [1,2] for processes and fields with "stationary increments" [1] A N. KOLMOGORODV ,Doklady Akad. Nauk SSSR, 30 (1941) 229 [2] A N. KOLMOGORODV ,Doklady Akad. Nauk SSSR, 32 (1941) 19 — Preceding unsigned comment added by 140.172.33.11 (talk) 22:41, 13 February 2013 (UTC)