Intrusion Variogram - Derive Variance

When modeling intrusions and employing the variography, there is a "variance" reported at the top - how is this variance calculated? The data to model my intrusion is categorical so where numbers are coming is a mystery.
My only guess it is something to do with the interval lengths?


  • Hi Michael,

    For the intrusion tool Leapfrog generates numeric, volume points along the drillhole trace; zero values at the contact, positive values internally, and negative values externally. The variance number you see there is the variance of the clipped volume / value points. In this particular intrusive / categoric context there probably isn't that much value in the number since it is a global statistic from system generated values.

    David Watkins