RE: sliding semilandmark issue - tpselw

[morphmet_moderator]

----- Forwarded message from "F. James Rohlf" -----

Date: Sat, 22 Sep 2012 18:40:34 -0400
From: "F. James Rohlf"
Reply-To: "F. James Rohlf"
Subject: RE: sliding semilandmark issue - tpselw
To: morphmet@morphometrics.org

The points slide along tangent vectors. It is a simple procedure that can get in trouble when the curve is not smooth or points are too far apart.

-------------
F. James Rohlf, E&E Stony Brook University
Sent from my mobile device

morphmet_modera...@morphometrics.org wrote:

----- Forwarded message from Eric Wilberg  -----

     Date: Fri, 21 Sep 2012 12:55:00 -0400
      From: Eric Wilberg
      Reply-To: Eric Wilberg
      Subject: sliding semilandmark issue - tpselw
      To: morphmet@morphometrics.org

While recently running an anlaysis in tpsrelw including sliding
semilandmarks, I noticed that the posterior-most one or two
semilandmarks on a curve were sliding past the anchor landmark on some
specimens. I thought the anchor points were supposed to be the
boundaries of the curve, thus the semilandmarks shouldn't be able to
slide past them. I went back and checked and these specimens were
digitized properly. Is this likely a problem with my data set or am I
misunderstanding what the anchor points are for?  Any help would be much
appreciated.

~Eric
eric.wilb...@uni.edu

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

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