Hi all, I'm working on a dataset with points spaced 2km in one direction (N-S), and 8 km in E-W one. Usually, working on data points equally spaced in all directions, I calculate the omnidirectional variogram, choosing the right lag value, and then calculate the directional ones using the same lag used for the omnidirectional variogram, in order to assess if spatial anisotropy exist, and then get the anisotropy ratio. My doubts are: 1) Is this procedure still valid in this case? Or I have to choose different lag values for directional variogram in N-S and E-W directions? 2) Using different lag values for different directions can I obtain a correct evaluation of anisotropy ratio? 3) More generally, "must" be the lag distance for directional variograms always the same of the omnidirectional one?
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