[R-sig-Geo] Distances in geoR package

[Ruben Roa]

> -----Original Message-----
> From: r-sig-geo-bounces at stat.math.ethz.ch
> [mailto:r-sig-geo-bounces at stat.math.ethz.ch]On Behalf Of giovanna jona
> lasinio
> Sent: 16 June 2005 12:59
> To: r-sig-geo at stat.math.ethz.ch
> Subject: [R-sig-Geo] Distances in geoR package
> 
> 
> Dear all, this may be a stupid question, but I wasn't able to find an
> answer in the FAQ and in the mail archive.
> I have a huge amount of  data, 644 sites for 30 different  
> times, which coordinates are expressed in decimal longitude and latitude, 
> I'd like to simply compute the empirical variogram and use "variofit" to estimate
> variogram's parameters for each time. The "variog" function uses
> euclidean distances and then it is not appropriate for lon-lat
> coordinate. Is there any way to change the distance type in 
> "variog"? Or which information are necessary to "variofit" in order to estimate
> variogram's parameters?
> 
> Thanks for any help
> Giovanna Jona Lasinio

I don't think you could do coordinate transformation in geostatistical packages.
Ernesto Jardim (on a message sent to this list the 9th of June) mentioned a package 
called spproj but today i could not find it in CRAN/bin/windows/contrib/2.0,2.1,2.2.
For coordinate transformation i use GeoConv. It is free and its author,
Eino Uikkanen, will be very glad to help you (me too). It works in batch mode 
so you can send all your 30 data files and get the output in a few seconds.
http://www.kolumbus.fi/eino.uikkanen/geoconvgb/
If all your data are all in the same UTM zone, then GeoConv will automatically identify
that zone.
Ruben