[R-sig-Geo] Help to estimate Anisotropy Parameters

[Jon Olav Skoien]

Mario,

The issue with the current version of intamap is that the anisotropy 
detection method is too slow and too memory consuming for larger data 
sets. The old version used a method based on the akima package, but this 
was discontinued because of incompatible licenses (akima is strictly 
non-commercial). If your use is non-commercial (you seem to email from a 
university), you might be able to use an old version of intamap, as the 
later changes to the package does not affect analyses. You might need 
Rtools or devtools to install the tar-file if you are on Windows, 
although I dont think it is necessary.

 > 
download.file("http://cran.r-project.org/src/contrib/Archive/intamap/intamap_1.3-23.tar.gz", 
"intamap_1.3-23.tar.gz")
 > install.packages("intamap_1.3-23.tar.gz", repos = NULL, type = "source")

There is a promising candidate for replacement, but we are still waiting 
for a bug fix in that package.

Best wishes,
Jon

On 15-Apr-14 17:12, Mario Montecinos Carvajal wrote:
> Dear fellow user of R
>
> I need a Little help
>
> I am trying to estimate Anisotropy parameters, from a large data set (13
> thousand data) that have Anistropy. All of these for correct the
> coordinates, allowing use of a directional Variogram for estimate the
> parameters that will be used for do a kriging.
>
> For  small data set of the same place, I use estimateAnistropy() function,
> from package intaMap, but the code of these function not allow working with
> large data set (function estimateAnisotropySc(), that is used for
> estimateAnistropy() function, have restriccion of size of data set) and
> moreover show of error of "Slope tensors estimation error. Override
> anisotropy estimation"
>
> Any help of suggestion will be very well received.
>
> Regards
>
>
>
>
>
>


-- 
Jon Olav Skøien
Joint Research Centre - European Commission
Institute for Environment and Sustainability (IES)
Land Resource Management Unit

Via Fermi 2749, TP 440,  I-21027 Ispra (VA), ITALY

jon.skoien at jrc.ec.europa.eu
Tel:  +39 0332 789205

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