Are those 2D or 3D landmarks? The tps programs are mostly for just 2D landmarks (tpsSmall is the exception). The reason the tps programs do not specify the maximum numbers of landmarks and specimens is that dynamic memory allocation methods are used so there is no fixed limit - other than available memory and time. I have never tried anything like 4k subjects so I do not know how well the tps programs will do with such large datasets.
If these are human data sets then I suspect that the variation in shape is so small that one only needs to obtain an approximation to the overall consensus configuration in order to obtain aligned configurations suitable for statistical analyses. You could probably just do a GPA on a random subject of subjectsand then align all subjectsto this consensus. That implies much less computation than a full GPA of 4k subjects. I suspect that the morpheus software will be much better at handling such large data sets than the tps programs. The tps programs cannot align point clouds or polygonal meshes. The programs are free so you can just try them. Can't you download them at home and try them to see how they work for your type of data? You will then be better able to decide which programs are worth the effort of getting special permission. ----------------------- F. James Rohlf State University of New York, Stony Brook, NY 11794-5245 www: http://life.bio.sunysb.edu/ee/rohlf > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of > [EMAIL PROTECTED] > Sent: Monday, December 08, 2003 11:52 AM > To: [EMAIL PROTECTED] > Subject: RE: tpsSmall update > > > I have to get special persmission to install any software on > my computer, so I haven't been able to download any of this > type of freeware yet. I hope to soon. I am trying to > determine which I should start with and I could use your help. > > Will any of these packages or modules (like Morpheus or the tps > modules) allow me to do Procrustes (least squares) alignment > of 72 landmarks on 4,431 subjects? I mean a full general > procrustes (all landmarks-all subjects simultaneously). If > this is too large a data set, does anyone know what the > landmark and subject limits are? I have been reading the > websites and the documentation that exists, but I haven't > seen anything with details like this. Also will any of this > software permit me to align point clouds or polygonal meshes > with 100,000 points or polygons or more? > > Thank you for any help you can provide, > > Kathleen M. Robinette, Ph.D. > Principal Research Anthropologist > Air Force Research Laboratory > > > == > Replies will be sent to list. > For more information see > http://life.bio.sunysb.edu/morph/morphmet.html> . > == Replies will be sent to list. For more information see http://life.bio.sunysb.edu/morph/morphmet.html.
