I did recently a map of maximum temperature for specific area in Quantum GIS 1.8.0 and its interpolation. However, I was wondering if there are only two method of interpolation, apart from ‘Triangulated Irregular Network (TIN)’ or ‘Inverse Distance Weighted (IDW)’. Maybe is there any extra plugin for that?
If you will install SAGA GIS, you will have Kriging and Spline interpolation available via SEXTANTE plugin.
Okay I dug into this a little. I installed the OSGeo4W build of QGIS installed (1.8) with the Grass version it comes with.
In the Sextante tool box are all the various splines.
v.surf.xxx they are listed under.
Nearest neighbor analysis is r.resample
I see kriging is available (all the major ones) in Qgis via sda4pp How to install SDA4PP plugin for Kriging in QGIS?
So it seems most are available.