Edzer, Not to deflate Cesar's project, but from our past email exchanges you are aware that I have been very pleased with the standalone version of your gstat program and feel that it interfaces wonderfully with GRASS 6.x; I would highly recommend this approach to anyone. Also, for those who may not be aware, use of the R gstat package is usable with GRASS GIS as well. This is not to say that the gstat-GRASS interface employs a modern GUI; it does not, but the interface is straightforward and very usable.
I also look forward to seeing the results of Cesar's development project. Regards, Tom Edzer J. Pebesma wrote: > Cesar Martinez Izquierdo wrote: > >> Hello list, >> we are trying to implement spatial interpolations (IDW and several types >> of Kriging) in our open source GIS application, which is written in Java. >> >> We plan to use JRI to connect with R from Java, and then use the >> features of "gstat" R-package to calculate the interpolations. >> >> However, we don't want R to draw the results of interpolations, we just >> want to get the raw result which we will draw in our GIS client. >> >> Now, the questions: >> - Do you think gstat is the best R package for this task? >> >> > As the author, I will refrain from commenting on this. It has a large > user base, a code that has been open source and stable for a long time, > and it has several options not found in other packages, notably block > kriging, cokriging, and kriging in a local neighbourhood with an > efficient search algorithm (quadtrees) for huge/massive data sets. > >> I've read that it doesn't allow not-projected data. Is there a package >> which provides similar algorithms and works with not-projected data? >> >> > Recently, this functionality has been added, only the quadtree algorithm > does not work in this case; I'm still in doubt whether quadtrees are > useful on a sphere. Consider this code somewhat experimental, but I'm > willing to help debug it if needed. It does, for example not check > whether covariance functions provided are positive definite on a sphere, > and has little (if any) functions specifically dedicated for this > purpose. It does compute great circle distances though. > > Another package that seems to deal with unprojected coordinates that you > may want to look into is package fields. > >> - Do you have some documentation regarding this topics (more exactly: >> documentation about how to get the results of a kriging, etc with JRI)? >> >> >> > Perhaps the JGR user interface is an example? > > I'm very interested in your developments and experiences; please keep > me/us updated on this mailing list. > -- > Edzer > >> Any comments and suggestions are welcome. >> >> Regards, >> >> >> > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > -- Thomas E Adams National Weather Service Ohio River Forecast Center 1901 South State Route 134 Wilmington, OH 45177 EMAIL: [EMAIL PROTECTED] VOICE: 937-383-0528 FAX: 937-383-0033 _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
