On 11/16/2010 05:40 PM, Mark Connolly wrote:
I noticed that autofitVariogram sets boundaries for the call to
gstat::variogram along the lines of (0.35 * diag(bbox(sp)) /100) *
c(2, 4, 6, 9, 12, 15, 25, 35, 50, 65, 80, 100). Any idea of the basis
of this method?
Mark
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Hi Mark,
Those values are quite a pragmatic choice, as I (and my co-authors)
write in my paper[1]:
Any of the assumptions made may leave room for improvement of the
procedures. As a first start, and for the purpose of automated mapping
of natural ambient dose rates, they seemed appropriate.
But I'm open to a discussion on improving, do you have any concrete
ideas right now?
Paul
package maintainer of automap
[1] http://dx.doi.org/10.1016/j.cageo.2008.10.011
--
Drs. Paul Hiemstra
Department of Physical Geography
Faculty of Geosciences
University of Utrecht
Heidelberglaan 2
P.O. Box 80.115
3508 TC Utrecht
Phone: +3130 253 5773
http://intamap.geo.uu.nl/~paul
http://nl.linkedin.com/pub/paul-hiemstra/20/30b/770
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