On Mon, 16 Jun 2003, Dieter Menne wrote: > Dear R-Listers, > > I have spatial data on an equidistant rectangular grid, similar to > topographic data. I know that there are quite a few R-packages or base > functions that provide nice iso-contours plot, but I don't want a plot, just > the smoothed isocontour line of ONE level (e.g. 10 mm). > > Data sets are large, so it would be preferable if the availability of > regular grid data could be exploited, and the fact that I only need ONE > isocontour line. Polynomial fits are not adequate, but loess works nicely > for the plots. Akima/interp might be a little too general, and if I remember > Brian Ripley's comments correctly, the coefficients are "only for internal > use". > > Can someone suggest me a package? > A similar question:
https://www.stat.math.ethz.ch/pipermail/r-help/2003-May/032907.html was asked by Renaud Lancelot in late May. The source package for clines is at: http://www.stat.auckland.ac.nz/~paul/R/clines_1.0.tar.gz which returns chosen contours from an input matrix as used in contour(). Roger > > Dieter Menne > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > -- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Breiviksveien 40, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93 e-mail: [EMAIL PROTECTED] ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
