3D semi-landmark analysis
-- Forwarded message --
From: *Erik Otarola-Castillo* mailto:eotar...@iastate.edu>>
Date: Wed, Dec 30, 2009 at 12:34 PM
Subject: Re: 3D semi-landmark analysis
To: morphmet@morphometrics.org <mailto:morphmet@morphometrics.org>
Francois,
Yes, if you are interested in quantifying and comparing
three-dimensional semi-landmarks, you would need to let the 3D
semilandmarks slide along their tangent directions (either along curves
or surfaces) during the GPA procedure to obtain correct estimates of
shape. The procedure is outlined in Gunz et al. 2005 (Semilandmarks in
three dimensions).
I believe Green and Bookstein’s Edgewarp software allows one to do this,
and it is freely available.
Dean Adams and I have recently developed an R routine for a general GPA
that allows superimposition of 2D or 3D landmark data. The landmarks can
represent locations of anatomical points, semilandmarks on curves, and
semilandmarks on surfaces. We are currently testing and packaging our
routine, and should have it available by February 1^st 2010.
Cheers,
Erik
On Thu, Dec 17, 2009 at 3:51 PM, morphmet
mailto:morphmet_modera...@morphometrics.org>> wrote:
Original Message ----
Subject: 3D semi-landmark analysis
Date: Thu, 17 Dec 2009 17:16:02 GMT
From: Francois Gould mailto:fgou...@jhmi.edu>>
To: morphmet mailto:morphmet@morphometrics.org>>
Dear list,
I'm trying to figure out how to analyze 3D semilandmarks on a surface
(specifically, a semi-landmark digitization of articular surfaces).
If I
understand things correctly, it is best to include a sliding algorithm
in the Procrustes fitting stage (when all the semilandmark
configurations are being translated, rotated and scaled). Am I correct
in thinking this? And does anyone know of any software that
incorporates
sliding in a plane for 3D semilandmarks?
Thank you.
Yours,
Francois Gould MSc
Graduate Student
Center for Functional anatomy and Evolution,
Johns Hopkins, Baltimore
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_
Erik Otárola-Castillo
Ecology and Evolutionary Biology Graduate Program
253 Bessey Hall
Iowa State University
Ames, IA 50011-1050
Phone 631-796-7331
http://www.public.iastate.edu/~eotarola/homepage.html
__
--
_
Erik Otárola-Castillo
Ecology and Evolutionary Biology Graduate Program
253 Bessey Hall
Iowa State University
Ames, IA 50011-1050
Phone 631-796-7331
http://www.public.iastate.edu/~eotarola/homepage.html
__
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Replies will be sent to the list.
For more information visit http://www.morphometrics.org
Re: 3D semi-landmark analysis
Original Message Subject: Re: 3D semi-landmark analysis Date: Thu, 17 Dec 2009 22:18:59 GMT From: gcass...@mail.unlu.edu.ar To: morphmet@morphometrics.org References: <4b2a99c7.1020...@morphometrics.org> Dear Francois, I think that resample free software may be useful for 3D semilandmarks. Take a look at the NYCEP Morphometrics Group http://www.nycep.org/nmg/programs.html Saludos Lic. Guillermo CASSINI Dto. Ciencias Básicas Universidad Nacional de Luján Argentina Original Message Subject: 3D semi-landmark analysis Date: Thu, 17 Dec 2009 17:16:02 GMT From: Francois Gould To: morphmet Dear list, I'm trying to figure out how to analyze 3D semilandmarks on a surface (specifically, a semi-landmark digitization of articular surfaces). If I understand things correctly, it is best to include a sliding algorithm in the Procrustes fitting stage (when all the semilandmark configurations are being translated, rotated and scaled). Am I correct in thinking this? And does anyone know of any software that incorporates sliding in a plane for 3D semilandmarks? Thank you. Yours, Francois Gould MSc Graduate Student Center for Functional anatomy and Evolution, Johns Hopkins, Baltimore -- Replies will be sent to the list. For more information visit http://www.morphometrics.org __ Information from ESET Mail Security, version of virus signature database 4697 (20091217) __ The message was checked by ESET Mail Security. http://www.eset.com __ Information from ESET Mail Security, version of virus signature database 4697 (20091217) __ The message was checked by ESET Mail Security. http://www.eset.com -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
3D semi-landmark analysis
Original Message Subject: 3D semi-landmark analysis Date: Thu, 17 Dec 2009 17:16:02 GMT From: Francois Gould To: morphmet Dear list, I'm trying to figure out how to analyze 3D semilandmarks on a surface (specifically, a semi-landmark digitization of articular surfaces). If I understand things correctly, it is best to include a sliding algorithm in the Procrustes fitting stage (when all the semilandmark configurations are being translated, rotated and scaled). Am I correct in thinking this? And does anyone know of any software that incorporates sliding in a plane for 3D semilandmarks? Thank you. Yours, Francois Gould MSc Graduate Student Center for Functional anatomy and Evolution, Johns Hopkins, Baltimore -- Replies will be sent to the list. For more information visit http://www.morphometrics.org
