Hi,
When I use the Geostatistical Wizard, I set some parameters, which confused me a lot.
Thanks a lot!
This workflow is really only suggested when you know that the new datasets will have the same general structure. Applying the same parameters to datasets that are different (ie, the presence and absence of trends) is not a good idea.
As for trend removal, the idea is to first do a very basic polynomial interpolation to remove the general trends, then you do kriging on the autocorrelation that is left over. The idea is that there is a general trend in the data, but there is also correlated variability around that trend. Trend removal takes care of the first part, and kriging takes care of the second part. In essence, you are interpolating twice, but the first time is only for general trends in the data.
Hi, Erik
I have another question for Kringing Geostatistical Wizard. Can I set the lower and upper values for the results of Kriging interpolation? Thanks!
No, you cannot control the maximum (or minimum) value of the interpolation. Whatever the maximum is (if there even is a maximum) will come from the kriging equations. These equations are constructed based on all the provided parameters, and the maximum/minimum will be whatever the equations say they are.
In fact, if we could detect the maximum and minimum, my life would be a lot easier. Currently, we symbolize geostatistical layers based on the min/max of the input data, not the actual interpolation. If we knew the min/max of the interpolation, we could symbolize the geostatistical layer based on these values. If you have ever noticed that geostatistical layers often look very different after being exported to raster, it is because of this issue. If we could detect the min/max of the geostatistical layer, we could make the symbology closely match the raster.
Thanks a lot. Yes, I find the the range of geostatistical layer is different from the raster one. So now I am thinking if I can set the range of geostatistiacal layer. What I mean is that I got the geostatistiacal layers, and I will set the range of these geostatistiacal layers, for example the minimum is 0, then I can use GA Layer To Points tool to get the values of the points, which supposed to be larger than 0.
What I seem to have stumbled across so far is that you can use Geostatistical Analyst/Explore Data to get an insight into the spatial distribution of point vector data and you can convert raster layers into geostatistical layers using the Geostatistical Wizard in Geostatistical Analyst. Then you can use these Geostatistical Layers as input to the Geostatistical Tools in Arc ToolBox. Am I right so far?