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Subject: Evaluating body length using tps landmark coordinates
Date: Tue, 10 Feb 2009 05:43:02 -0800 (PST)
From: Henrik Kusche <[email protected]>
To: morphmet <[email protected]>
Dear all,
using tpsdig2 I created an extensive tps-dataset that encodes body
shape in a fish species complex in terms of pixel units. Instead of
using the ruler tool in tpsdig2 I placed two additional landmarks,
(let´s say LM a and LM b respectively) beyond the fish body whose
distance on the original photo is equal to 10 centimeters (a ruler was
photographed below the fish).
Among others I have two landmarks LM x and LM y ( LM x at the tip of
the snout and LM y at the base of the tail fin respectively) that
define the body length of the fish.
My problem is that I would like to use the 2 "10cm-scaling landmarks"
thus LM a and LM b as a length reference that permit me to assess the
distance between LM x and LM y, thus the body length of the fish.
I would be very happy if someone of you could help me with this problem.
Best wishes, Henrik
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