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 -- Dr Renaud Lancelot, v?t?rinaire CIRAD, D?partement Elevage et M?decine V?t?rinaire (CIRAD-Emvt) Programme Productions Animales http://www.cirad.fr/fr/pg_recherche/page.php?id=14 ISRA-LNERV tel +221 832 49 02 BP 2057 Dakar-Hann fax +221 821 18 79 (CIRAD) Senegal e-mail renaud.lancelot_at_cirad.fr _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
