In jgrasstools 0.78, what are the variogram models corresponding to the values
1 of the
1, it seems to be a Gaussian variogram, by looking at the source. But for mode
0, it uses the variance of the measurements and something called an "integral scale" (fields
The formula for the covariance in this mode is
variance * exp(-h^2), where
variance is the supplied variance,
exp(x) is the exponential function, and
h^2 is the square of the distance between the points (the distance in each axis is "normalized" by the integral scale).
What variogram model is this? The formula for the exponential variogram model is more complex, according to Wikipedia. I also did not find a corresponding formula in Isaaks & Srivastava's An Introduction to Applied Geostatistics either.