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.







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.







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)