Thanks to everyone who answered. Dear Dr. Rohlf, I assumed great variability would be a problem. I was thinking the best way of digitizing would be to draw a curve on the outline of each leaf (simple and lobed leaves). Resample curves by length with approx. 40 landmarks. Then append curves to landmarks. Two landmarks, the leaf tip and base, would be fixed others could be defined as semi-landmarks. Is this sensible? Alternatively, we could analyse simple and lobed leaves separately. Thank you a lot for your help.
Tina From: f.james.rohlf [mailto:f.james.ro...@stonybrook.edu] Sent: Wednesday, March 14, 2018 3:59 AM To: Tina Klenovšek Subject: Re: [MORPHMET] digitizing very variable leaves An assumption of the usual GMM methods is that shape variation is "small". I think these leaves exceed this quite a bit! Another problem is landmarks. How to match leaves with and without lobes? __________________ F. James Rohlf, Distinguished Prof. Emeritus Dept. Anthropology and Ecology & Evolution Stonybrook University -------- Original message -------- From: 'Tina Klenovšek' via MORPHMET <morphmet@morphometrics.org> Date: 3/12/18 10:56 AM (GMT-10:00) To: morphmet@morphometrics.org Subject: [MORPHMET] digitizing very variable leaves Hello everyone, we would like to digitize tree leaves that are very variable (from simple oval to strongly lobed on one tree). 1.) I am wondering if TpsDig can do some kind of automatic digitizing like the LeafAnalyser software: http://www.plant-image-analysis.org/software/leaf-gp, which evenly distributes a defined number of landmarks on the leaf outline... LeafAnalyser does not seem flexible or precise enough. Or I can’t use it properly. Any experience? 2.) Is it possible/sensible to put objects that are so differently shaped (photos attached) into the same group or is it better to analyse simple and lobed leaves separately? I apologize if similar questions have been already answered... Kind regards, Tina [cid:image002.jpg@01D3BA4C.D9433EA0] doc. dr. Tina Klenovšek, koordinatorica doktorskega študijskega programa Ekološke znanosti Univerza v Mariboru | University of Maribor Fakulteta za naravoslovje in matematiko Faculty of Natural Sciences and Mathematics Koroška cesta 160, 2000 Maribor, Slovenija T: +386 41 808 366 E: tina.klenov...@um.si<mailto:ime.prii...@um.si>, www.fnm.um.si<http://www.fnm.uni-mb.si> -- MORPHMET may be accessed via its webpage at http://www.morphometrics.org --- You received this message because you are subscribed to the Google Groups "MORPHMET" group. To unsubscribe from this group and stop receiving emails from it, send an email to morphmet+unsubscr...@morphometrics.org.
