On Feb 13, 2008 12:10 AM, Hamish <[EMAIL PROTECTED]> wrote: > Dylan Beaudette wrote: > > > However-- this is starting to get into the realm of feature > > > bloat... > > > As neat as it would be to have R routines which could work directly > > > on GRASS data structures, it might be overkill considering the > > > possible amount of work. I'll keep checking around and post back > > > other ideas. > > > Well, people always seems to ask about kriging because they've heard of > it. > http://lists.osgeo.org/pipermail/grass-user/2004-May/025709.html > > (see s.surf.krig in GRASS 5 and v.surf.krige on the wiki addons page)
This does seem to come up a lot. However... <rant> This is one piece of functionality I would rather see in a specialized system-- i.e. implemented through gstat etc. Kriging is one of those semi-mystical things that gets lumped into many GIS courses, and through the magic of automated wizzards and such-- out pops a map. Unlike RST / IDW, kriging requires several important steps and decisions (variogram estimation, assessment of stationarity, etc..) which the act of using something like gstat (partially) ensures. </rant> That said-- this is one of the cases where a strong tie to R is a great thing. The use of an embedded R (per my previous comments) might facilitate these more complex operations (kriging) in a way that is not abstracted away from the wealth of good documentation (thinking gstat here). Without much trouble it would be possible to document a standard kriging exercise with the spearfish data (or the new NC data)-- such that the concern expressed in the linked thread (http://lists.osgeo.org/pipermail/grass-user/2004-May/025709.html) can be addressed. Here is one such (not necessarily the best) example: http://casoilresource.lawr.ucdavis.edu/drupal/node/438 > > > > On the other hand-- R has so many great plotting / analysis > > > routines, it would be a shame to re-implement these in GRASS if > > > they could be easily "plugged-into" via some kind of share library > > > / SWIG interface. > > Yup, it would be nice to be able to provide modules with R as the > backend versus writing/maintaining something new ourselves. > I suppose that these things really belong in a discussion on GRASS7. I'll try and keep on topic! Dylan > > > ____________________________________________________________________________________ > Looking for last minute shopping deals? > Find them fast with Yahoo! Search. > http://tools.search.yahoo.com/newsearch/category.php?category=shopping > > _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
