And if you scan your plots you can import them as images into OSX Stereonet, then trace the circles. --- Dr. Andy R. Bobyarchick | Geologist Associate Professor of Earth Sciences Tectonics and Applied Geophysics Laboratories Director M.S. Earth Sciences Graduate Coordinator Department of Geography and Earth Sciences University of North Carolina Charlotte McEniry 308 | +1.704.687.5998 AndyBobyarchick(at)uncc(dot)edu -- From: Francesca Meneghini <[log in to unmask]<mailto:[log in to unmask]>> Reply-To: "Tectonics & structural geology discussion list <[log in to unmask]<mailto:[log in to unmask]>>" <[log in to unmask]<mailto:[log in to unmask]>> Date: Tue, 10 Jan 2012 12:34:26 +0100 To: "Tectonics & structural geology discussion list <[log in to unmask]<mailto:[log in to unmask]>>" <[log in to unmask]<mailto:[log in to unmask]>> Subject: Re: digitize great circles Hi Andrea, I am using OSXSTEREONET on my Mac(Allmendinger's Stereonet softwares, download at http://www.geo.cornell.edu/geology/faculty/RWA/programs/ or http://homepage.mac.com/nfcd/work/programs.html) . It works really well. Ciao Francesca On 10 January 2012 11:45, Andrea Bistacchi <[log in to unmask]<mailto:[log in to unmask]>> wrote: Dear All, due to some unlucky event, I need to recover some orientation data that I just have as great circles in stereoplots. Basically I'd like to digitize the great circles and get back the Azimuth/Dip data. Could anyone help me to find a useful software tool? Thanks very much in advance! Andrea Bistacchi Andrea Bistacchi Dipartimento di Scienze Geologiche e Geotecnologie Universita' degli Studi di Milano Bicocca Piazza della Scienza, 4 20126 Milano [log in to unmask]<mailto:[log in to unmask]> -- Un vero viaggio di scoperta non è cercare nuove terre, ma avere nuovi occhi - M. Proust ><><><><><><>< Francesca Meneghini, PhD Dipartimento di Scienze della Terra Università di Pisa Via S. Maria 53 56126 Pisa ITALY tel: 0039 050 2215814 e-mail: [log in to unmask]<mailto:[log in to unmask]> http://academic.sun.ac.za/earthSci/people/meneghini.htm ><><><><><><><