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Questions tagged [covariogram]

Covariogram is a variogram/plot of the covariance or the extremal coefficient functions and the practical range estimated fitting a Gaussian (or can be a max-stable random) field with the composite-likelihood or by using the weighted least square method.

Covariogram is a variogram/plot of the covariance or the extremal coefficient functions and the practical range estimated fitting a Gaussian (or can be a max-stable random) field with the composite-likelihood or by using the weighted least square method.

Example from upenn university

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Equation of 'Spherical model' used to fit an experimental variogram in R

I was wondering what sets of equations are used to fit an experimental variogram when I choose it to be a spherical model. For instance, I used the following parameters of a spherical model: model psill range 1 Nug 5384.346 0.0000 2 …
ToNoY
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How to fit model with semivariogram using gstat in R?

I have a csv file file contains atmospheric PM10 concentration data of 1 march,12.00 pm.please, download. I want to draw a semivariogram using gstat package in R. I tried to write these code in R. but with these data, I cant fit the model. …
Orpheus
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R_number of pairs for each lag in a Variogram

I am using geoR package for spatial interpolation of rainfall. I have to tell that I am quite new to geostatistics. Thanks to some video tutorials in youtube, I understood (well, I think so) the theory behind variogram. As per my understanding, the…
rm167
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Why does variogram always plots 15 points in R?

I would like to plot a variable number of points as my sample size increases. However, for some reason the "variogram" function only plots 15 points every time. I checked to make sure that the size of the data I'm passing "variogram" was varying…
makansij
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R Error in chol.default(A) krigeST from gstat package

I am working with an hourly dataset of air temperature, recorded at ~200 stations over a relatively small area. I chose a space-time variogram (e.g. sum-metric) to fit my data and am now trying to make predictions over my same stations in order to…
Francesco Tonini
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Creating a semivariogram in R starting from a GeoTiff file

I'm trying to create a semivariogram in R, giving it data from a raster coming from a GeoTif file. The version of Rstudio I'm running is the "Elsbeth Geranium" Release (7d165dcf, 2022-12-03) for Windows and my OS is windows 10 home. The variogram…
MJHorst
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Cross variogram negative : flip upside down

Using the "Cokriging" method, I first did a cross variogram. However, I had a negative relationship between my two variables taken, which led to the variogram crossed upside down. I was wondering if it was possible to overthrow it so that it would…
Vulraan
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Ways to plot 3D variogram

I am trying to plot 3D variogram of porosity taking X and Y as coordinates and z as time. Can someone help me out to find a way to plot 3D variogram? I have tried with GSTools, pykridge, GStat.
Noor Ul huda Choudhary
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How to build a variogram for soil properties

I'm a new user of R, which I use in my studies in digital soil mapping. I have my data, as you can see in my .csv file. There are columns SN (sample number), SAND, SILT, CLAY, OM (Organic Matter). I am trying to create a variogram for each property.…
Dimitris K
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How can i access to semivariogram in python with my information through scikit-gstat library?

I want to generate a semivariogram (exponential, gaussian, spherical) in python with regard to excel's information which has X, Y (need to calculate h), and EC in those mentioned places, please localize this in the Scikit-gstat…
Hosein
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plotting semivariograms with non-nlme package models

I am trying to plot a semivariogram of my model residuals for a generalised mixed effect model in R. Doing this for a mixed effect model with normal distribution is straightforward with the nlme package, and using the quakes dataset as an…
willbutdontwanna
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Variogram manual calculation

I have a question about variograms please. In fact, I only have points with their Z(pi) values and the distances between them. (For example a point p1(z(p1),d(p1,p2), d(p1,p3),.., d(p1,pn))) I want to estimate the variogram for those having a…
roger
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Variogram in R with distance in km

I'm doing a spatial analysis on my data and I have their localization in terms of longitude and latitude. I calculated the sample variogram in R with geoR and gstat but what I get is the sample variogram with the distance in grades (longitude and…
AliceW
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Variogram plot for Sill, Nugget, Range

I'm working on Temporal-spatio data. Data is in STFDF structure. I'm at the stage where applying variogram and try to determine Nugget, Sill, and Range from variogram plot that should look like this . something like this: However when I plot my…
Reta
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Covariogram Method for a Binary Image in R

I am trying to obtain a covariogram plot in order to calculate some values over it. Here is the work which is done before; Quantitative Analysis of Banded Structures in Dual-Phase Steels Just read the 2. page, that will be enough to understand the…
EMI
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