680 Lab 5 - Disjunctive / Indicator kriging
Objective: The lab's main objective is check out
(ArcGIS Geostatistical Analyst's) facilities for disjunctive
and indicator kriging.
(You can try R or Surfer instead if you like.)
Just one data set this time (like the W&O example):
- Broom's Barn Farm - exchangable potassium
Look for indicator, disjunctive and probability kriging in the interface and
software documentation. ("Hermite Polynomials" is not indexed
but there is an option for "Gaussian kernel" in step 2 of the
G-wizard that might be acomplishing the same thing.)
Looking around in there should give you the "lay of the land".
What are the apparent differences?
Then, take the facilites for a spin using the threshold that
W&O suggest, 25 mg/l. Try all three indicator, disjunctive and probability
kriging. What outputs do they give you?
Compare a prediction map result with a contoured (or reclassifyed) surface from
ordinary kriging w.r.t. the critical value. Do you see any difference?
Report what you've found.
A brief (maximum 5 pages) report addressing your assessment
of the technique.
Due: in two weeks.