# Tagged Questions

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### R gstat how to predict onto exsisting grid

The example in gstat package manual shows how to predict onto a 100x100 grid. I would like to know how to predict onto a grid matching an existing grid in asc format. How can I use an existing grid to ...
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### Interpreting gstat fit.variogram - partial sill vs sill [duplicate]

How do I interpret the output of fit.variogram. If you compare the plot to the output in the picture, it seems that 77 is the nugget and 207498 is the range. But I don't understand where the 197 comes ...
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### How do you constrain variogram estimates to be a percentage?

I am interpolating soil texture data with GeoR and ARCGIS. The ordinary kriging process is straight forward and GeoR facilitates cross validation. Has anyone else produced variogram parameters, nugget ...
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### Is there an intuitive interpretation of a negative variogram “nugget” value?

A variogram plots the variance of the difference between sample pairs on a field (any dimensionality) against spatial separation (the "lag") of those samples. The extrapolation from observed ...
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### Creating a variogram for geographical data

I want to create a covariogram for a certain field R distributed on a geographical area. Which sort of packages are available to calculate covariogram. Also the distance metric is geographical ...
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### Creating model variogram from experimental variogram

I have this data consisting of the variance for different distance, I mean experimental variogram. How can I create a model variogram from this in matlab
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### Creating variogram for a 10,000 set data

I am trying to create a variogram for a data set with 10,000 points. However, if I try to actually calculate the distance of each point with the other then I will have 10,000*9999/2 pairs. Out of ...
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### Analyzing ratios or numerator/denominator, with weights, measured over time at irregular intervals

I have gathered information on the rate increases allowed by a government regulator over about 17 years. As background, utilities in this area must apply to the regulator if they wish to raise their ...
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### Correlation of elevation data and elevation uncertainty as a function of range in a DEM

I would like to ask a question to experts on spatial statistics: I have a gridded Digital Elevation Model (DEM) which provides terrain elevation (z) at cartesian coordinates (x,y). Together with the ...