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I have a very special map to make: it's a sea bird density map. To do this, I interpolate the observation points with ordinary kriging with a variogram. As I've read, the variogram must be of "spherical" type. The default one in SAGA is linear, but one can modify the equation. My question is: which equation should I use?

Variogram equations

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    You can find the equation of the Spherical model for example here: en.wikipedia.org/wiki/Variogram#Variogram_models. I think the last option from the drop-down menu is what you're looking for. But better check for yourself, I tend to make mistakes looking at equations written in this form. – Janina Jun 14 '17 at 7:30
  • @Janina Will you post your comment as answer? Much appreciated. – Kazuhito Feb 3 '18 at 7:54
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You can find the equation of the Spherical model for example on Wikipedia:

enter image description here

I think the last option from the drop-down menu is what you're looking for.

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