I have 45 cores from 3 fields and I also have Veris P4000 Vis-NIR spectra up to 100 cm deep at those 45 locations.

I would like to take calibration samples from the cores but the question is from which depths?

The final aim is to be able to predict the soil in all depths in all of the 45 cores and then interpolate them in 3 dimensions making a cube map of the field.

I am thinking about Latin Hypercube on the spectra of each of the 45 cores and then take let's say 3-4 calibration soil samples to do lab analysis on.

Any suggestions?

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