2

Is there a possibility to define the range-value or display the Variogram when you call the SAGA-Kriging-Module from QGIS? Maybe by using the python console?

enter image description here

1

In the Kriging (e.g. OK) dialogue window, the Variogram Model option (default: a + b * x as shown in your posted picture) requires your direct input of the equation.

Some models (Exp, Sph) use Range, whose input parameters are defined as:

  • a: Nugget
  • b: Difference between Sill and Nugget (i.e. s-n)
  • c: Range

(Note that the meaning of b in the linear model a + b * x is the slope).

For example, to use popular Spherical Model (which equation is a + b * ifelse(x > c, 1, 1.5 * x / c - 0.5 * x^3 / c^3)), simply write it into the Variogram Model option window with your own parameters like below:

enter image description here

(You'll see my Nugget is 0.214, Sill is 1.774, and Range is 514.4 meters).

4
  • sorry. I am struggling to find a solution. I thought you might be able to help if I put that into your notice. I apologize. – bibinwilson Nov 2 '19 at 6:41
  • Thank you so much. This is the question: gis.stackexchange.com/questions/340315/… – bibinwilson Nov 2 '19 at 7:10
  • Thank you ver much, you solved my Problem. Btw is there a possibility to build a variogramm using QGIS or call the saga variogramm from QGIS? – Rob Nov 3 '19 at 16:58
  • 1
    @Rob I'm glad. As far as I know you will need to run R through the Processing Toolbox to build variograms in QGIS. Perhaps you can post your question. – Kazuhito Nov 3 '19 at 21:59

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.