-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
Thanks a lot Nikhil The functions seem to do what I need, but I am looking into the package adehabitat as suggested by Mathieu and it seems to be ideal for the purpose. Thanks a lot, Rainer On 30/07/10 17:22, Mathieu Basille wrote: > Hello, > > Have you considered using the 'adehabitat' package? It presents classes > and tools for the analysis of trajectories, and automagically computes > absolute and relative angles. I'm not that familiar with polylines (in > ArcGIS or sp) so that I don't have a working example at hand, but you'd > have to extract coordinates of the polylines to build a ltraj object > (using as.ltraj), keeping the ID of the line as the ID of the ltraj, and > with 'typeII = FALSE' which means that you don't have the exact date. > > In the end, an object of class ltraj is a list with a data frame for > each element of the list (for you a line), which gives you both kind of > angles among other variables (dx, dy, dist, etc.). > > Hope this helps, > Mathieu. > > > Le 30/07/2010 03:33, Rainer M Krug a écrit : > Hi > > a friend of mine wants (needs?) to determine the angle between segments > in an ESRI polyline (line vector feature). As there does not seem to be > an easy way in ArcGIS 9.2, I thought about askeng here: > > Is there way of calculating these angles between the different line > segments in R (after importing the line feature into R)? > > Thanks, > > Rainer > >> _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo - -- Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Natural Sciences Building Office Suite 2039 Stellenbosch University Main Campus, Merriman Avenue Stellenbosch South Africa Tel: +33 - (0)9 53 10 27 44 Cell: +27 - (0)8 39 47 90 42 Fax (SA): +27 - (0)8 65 16 27 82 Fax (D) : +49 - (0)3 21 21 25 22 44 Fax (FR): +33 - (0)9 58 10 27 44 email: rai...@krugs.de Skype: RMkrug -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkxa5ZkACgkQoYgNqgF2egpMbgCeMlPf346ToUfWsoWKkY0TiboO OVsAn36YYFOrWk25g8uC9lEs4N0TVevt =HRWJ -----END PGP SIGNATURE----- _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
