RE: what happens if data with semilandmarks are re-superimposed

[F. James Rohlf]

The reason I did not add the sliding semilandmarks method to the other tps
programs right away was that it was not necessary (although it would be
convenient). My expectation was that people would use tpsRelw to slide and
then save the aligned specimens to a file and use it in the other tps
programs. 

I will at some point replicate the method to the other tps programs but
right now I am busy with what will be version 2.0 of tpsDig. It will then
handle large image files and provide many new features. I hope it will be
ready in a few weeks but it depends on what problems and/or distractions
arise.

-------------------------------------------------
F. James Rohlf -SUNY Stony Brook, NY 11794-5245
FAX: 1-631-632-7626 www: http://life.bio.sunysb.edu/ee/rohlf

 

> -----Original Message-----
> From: [EMAIL PROTECTED] 
> [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
> Sent: Monday, September 20, 2004 9:36 AM
> To: [EMAIL PROTECTED]
> Subject: what happens if data with semilandmarks are re-superimposed
> 
> 
> Dear morphometricians,
> I take the chance offered by the topic discussed in the last 
> few messages to ask a similar question.
> Sliding semilandmarks are, for now, implemented only in 
> TPSrelw (among programs of the TPS-series). I was wondering 
> whether semilandmark data superimposed with TPSrelw could 
> then be used in other TPS-series programs (or in Morpheus). I 
> am concerned that a second superimposition, which does not 
> take into account the difference between semilandmarks and 
> 'traditional' landmarks, may affect results. I tried and 
> compared results checking the correlation between distance 
> matrices obtained with and without re-superimposition. No 
> difference was evident. Thus, it should not matter. However, 
> I'd like to have your comments about this.
> Your advice is always greatly appreciated. Thanks a lot.
> Best
> 
> Andrea
> 
> ==
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> http://life.bio.sunysb.edu/morph/morphmet.html.
> 

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