Hello Bill, There seems to be several instances in Pro (or MapInfo technology in general) where true spherical geometry is not used. As previously discussed on the list, buffers (even specially Spherical ones) are also not based on true spherical geometry.
Regards, Warren Vick Europa Technologies Ltd. http://www.europa-tech.com -----Original Message----- From: Bill Thoen [mailto:[EMAIL PROTECTED]] Sent: Friday, August 09, 2002 4:17 PM To: Gary Schwartz Cc: MapInfo-L Subject: Re: MI-L Voronoi in MIPro 7.0 After a second look, I think maybe you are right. There are still some problems. Voronoi polygons are created by connecting the centers of Delauney triangles, and it appears that this is not happening with MapInfo's Voronoi function. I'm going to poke at this a bit more... Gary Schwartz wrote: > > Has anyone taken a close look at the Voronoi polygons generated by MI > Pro 7.0? It looks to me like they are incorrect. The line segments > that comprise the polygons should perpendicularly bisect the lines > connecting the nearest neighbor points. However, they clearly do not. > Is MapInfo using cartesian geometry to create these instead of > spherical? Any ideas? > > Thanks, > Gary. > > -- > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Gary Schwartz > Director of Software Development > Mapping Analytics > 2 Graham Road West > Ithaca, NY 14850 > (585) 271-6490 > [EMAIL PROTECTED] > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > --------------------------------------------------------------------- > List hosting provided by Directions Magazine | www.directionsmag.com | > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > Message number: 2440 -- - Bill Thoen ------------------------------------------------------------ GISnet, 1401 Walnut St., Suite C, Boulder, CO 80302 tel: 303-786-9961, fax: 303-443-4856 mailto:[EMAIL PROTECTED], http://www.gisnet.com ------------------------------------------------------------ --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 2443 --------------------------------------------------------------------- List hosting provided by Directions Magazine | www.directionsmag.com | To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] Message number: 2449
