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?
1 Answer
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:
(You'll see my Nugget is 0.214, Sill is 1.774, and Range is 514.4 meters).
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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. Commented Nov 2, 2019 at 6:41
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Thank you so much. This is the question: gis.stackexchange.com/questions/340315/… Commented Nov 2, 2019 at 7:10
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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?– RobCommented Nov 3, 2019 at 16:58
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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.– KazuhitoCommented Nov 3, 2019 at 21:59