Dear All ? I am mapping forest site productivity for one of most important species in one of the oldest forests in the world, Hyrcanian Forests, Iran. Dear All, I used rose plot function written by Jon Graham (http://www.math.umt.edu/graham/stat544/) and found there is an anisotropy in the variogram for kriging and I included the anisotropy in variogram fitting. Dear All, I want to investigate the anisotropy for cokriging and if there is anisotropy, I want to consider it for cokriging. I search many textbooks and also in the internet and found NOTHING for anisotropy for cokriging. I would be very grateful if ANYONE can help me how can I study the anisotropy for cokriging and include it the model. Another question is about argument cressie=T in gstat package. For krige function in gstat package there is cressie=T, if there are outliers. For my data, it seems there are some outliers and I want to include cressie=T for variogram for fitting cokriging. I did not see any argument in gstat function. I would be extremely grateful for any help Thanks and regards Jalil ********************************** Seyed Jalil Alavi, Ph.D Assistant Professor in Statistical Ecology Dept. of Forestry Faculty of Natural Resources Tarbiat Modares University P.O.Box 46417-76489 Noor Mazandaran Iran Mobile Phone Number 00989111580097 Tel:0098(122)6253101-3 http://www.modares.ac.ir/en/Schools/nat/Academic_Staff/~j.alavi
Anisotropy for Cokriging
2 messages · Seyed Jalil Alavi, Edzer Pebesma
1 day later
On 08/01/16 19:52, Seyed Jalil Alavi wrote:
Dear All ? I am mapping forest site productivity for one of most important species in one of the oldest forests in the world, Hyrcanian Forests, Iran. Dear All, I used rose plot function written by Jon Graham (http://www.math.umt.edu/graham/stat544/) and found there is an anisotropy in the variogram for kriging and I included the anisotropy in variogram fitting. Dear All, I want to investigate the anisotropy for cokriging and if there is anisotropy, I want to consider it for cokriging. I search many textbooks and also in the internet and found NOTHING for anisotropy for cokriging. I would be very grateful if ANYONE can help me how can I study the anisotropy for cokriging and include it the model.
There's nothing special to it, except that very few people actually do it. Under the linear model of coregionalisation, the range ellipse (or ellipsoid) has to be identical for all direct and cross variograms.
Another question is about argument cressie=T in gstat package. For krige function in gstat package there is cressie=T, if there are outliers. For my data, it seems there are some outliers and I want to include cressie=T for variogram for fitting cokriging. I did not see any argument in gstat function.
It is only defined (and implemented) for direct variograms, not for cross variograms.
I would be extremely grateful for any help Thanks and regards Jalil ********************************** Seyed Jalil Alavi, Ph.D Assistant Professor in Statistical Ecology Dept. of Forestry Faculty of Natural Resources Tarbiat Modares University P.O.Box 46417-76489 Noor Mazandaran Iran Mobile Phone Number 00989111580097 Tel:0098(122)6253101-3 http://www.modares.ac.ir/en/Schools/nat/Academic_Staff/~j.alavi [[alternative HTML version deleted]]
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Edzer Pebesma Institute for Geoinformatics (ifgi), University of M?nster Heisenbergstra?e 2, 48149 M?nster, Germany; +49 251 83 33081 Journal of Statistical Software: http://www.jstatsoft.org/ Computers & Geosciences: http://elsevier.com/locate/cageo/ Spatial Statistics Society http://www.spatialstatistics.info -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 490 bytes Desc: OpenPGP digital signature URL: <https://stat.ethz.ch/pipermail/r-sig-geo/attachments/20160110/9fc102d6/attachment.bin>