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
Alternatively, we could analyse simple and lobed leaves separately.
Thank you a lot for your help.
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
-------- Original message --------
From: 'Tina Klenovšek' via MORPHMET <firstname.lastname@example.org>
Date: 3/12/18 10:56 AM (GMT-10:00)
Subject: [MORPHMET] digitizing very variable leaves
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...
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
MORPHMET may be accessed via its webpage at http://www.morphometrics.org
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