missing landmarks in 3D

Thu, 23 May 2013 23:51:00 -0700


----- Forwarded message from Daniela Sanfelice <[email protected]> -----

Date: Thu, 23 May 2013 13:36:14 -0400
From: Daniela Sanfelice <[email protected]>
Reply-To: Daniela Sanfelice <[email protected]>
Subject: missing landmarks in 3D
To: [email protected]

Dear morphometricians,

I have the  same question as Diego about missing landmarks in a 3D dataset. I know that OSymm()  can estimate the coordinates for missing landmarks from their bilateral homologues in 3D, but I am still not familiar with R...

If some of you know other ways, please let me know...

Thank you very much!

Cheers, Daniela Sanfelice ([email protected])

----- Forwarded message from Diego Astua de Moraes <[email protected]> -----

Date: Wed, 22 May 2013 09:50:23 -0400
From: Diego Astua de Moraes <[email protected]>
Reply-To: Diego Astua de Moraes <[email protected]>
Subject: Missing landmarks in 3D
To: [email protected]

This may be obvious to several here, but as this is our first work with 3D lmks, I probably missed an easy step.
Is there a straightforward way to obtain a landmark by reflecting its symmetric through the saggital plane (I want to replace a missing lmk that is present on the other side). I can do that easily in 2D by translating and rotating the midline so that it matches the x or y axis, and the obtain the reflected lmk, but I don´t deal that well with 3D translations and rotations...
I would like to do that on my landmark set before "gluing" the dorsal and ventral datasets on DVLR. DVLR does provide the option of a missing landmark but it is still missing the the combined view...
In time, I am only going through this because my sample size for this particular taxon is really small and every specimen matters, and because the missing landmark is a different one in each specimen (meaning I cannot simply discard that lmk...).
Thanks
Diego

Diego Astúa de Moraes, D.Sc.
Laboratório de Mastozoologia
Departamento de Zoologia, Universidade Federal de Pernambuco
Av. Professor Moraes Rego, s/n. Cidade Universitária 
50670-420 Recife, PE, Brasil.
Te./Fax: (81) 2126-8353
email: [email protected] / [email protected]
http://www.ufpe.br/mastozoologia/



----- End forwarded message -----



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