-------- Original Message --------
Subject: Re:Scale
Date: Sat, 17 May 2008 09:28:25 -0700 (PDT)
From: thimacek <[EMAIL PROTECTED]>
To: morphmet <[email protected]>
Alexandra,
scale is irrelevant for the analysis of shape itself, but if you wish
to use centroid size as a measure of size (maybe to test for allometry
or something like that), you'll have to include some measure of scale.
If you have some object of known size in the images (like a ruler, for
example), you can include a 'scale factor' in the TPS files. If you're
using TPSdig, the program includes an option to do so, which involves
defining the known length in the image and the real length that it
corresponds to.
Hope that helps,
Thiago
> -------- Original Message --------
> Subject: Scale
> Date: Fri, 16 May 2008 16:05:16 -0700 (PDT)
> From: Alexandra Herrera M.
> Reply-To: [EMAIL PROTECTED]
> To: [email protected]
>
> Hi everybody, we want to construct a file to do TPS analysis. We have
> images of several museum specimens, taken at different magnifications.
> Do we need to put all the images at the same scale, or this is an
> unnecessary step? We are a little worried that different magnifications
> can have an effect on the computation of the geometric scale and the
> centroid. Thanks in advance,
>
> Alexandra
>
> Alexandra Herrera Martinez
> Biology Department
> University of Puerto Rico
> San Juan,PR 00931-3360
> P.O. Box 23360
> U.S.A.
>
>
>
>
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