I believe you are looking for the function contourLines() in package graphics.
At some point in the intervening years there was a clines package on CRAN, and if you know that you can find it at http://cran.r-project.org/src/contrib/Archive/C/clines_2.0-2.tar.gz That confirms it has been superseded by contourLines. BTW, it is Paul Murrell (two l's) we have to thank for this. On Thu, 31 May 2007, Andrew Niccolai wrote: > I realize that as of yesterday, this message thread is 4 years old but can > someone possibly post the clines function that Renaud mentions in the > posting below? That would be wonderful and most appreciated. > > Thanks, > Andrew > > > Andrew Niccolai > Doctoral Candidate > Yale School of Forestry > > > > From: Renaud Lancelot <lancelot> > Date: Fri May 30 22:37:02 2003 > > Yesterday, I posted the following: > >>> I have computed a digital terrain model from a set of points (x, y, z) >>> using the function interp() in package akima. I want to predict flooded >>> surfaces given target values of z. I can display the flooded surfaces >>> with contour() or image(), but I don't know how to get the polygons >>> delimiting the surfaces. Did anyone write a function for this purpose ? > > Many thanks to Roger Bivand, Paul Murrel, Deepayan Sarkar, Barry > Rowlingson and Thomas W Blackwell for their replies and their help. Paul > Murrel provided me with a function "clines", kindly ported to Windows by > Duncan Murdoch. This function does exactly what I need, i.e. it returns > a list of polygons corresponding to target value(s) of z. > > I wrote a function to compute (hopefully !) what I want, i.e. predicted > flooded surfaces given target values of z (managing the cases of several > independent watered surfaces, possibly with islands). Provided that Paul > Murrel agrees to share his function, I will be happy to send it to > anyone wishing to use and improve it (and debug it ;-) ). > > Best regards and thanks again, > > Renaud > > -- Brian D. Ripley, [EMAIL PROTECTED] Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595 _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
