I've not checked for quite a while and certainly not in the latest
version. I think there used to be a bug and the tps coordinates were
(possibly) not scaled. I am stuck with teaching and cannot check right now.
I would:
1) Save both formats (even if TPS may be less useful, as the
relationship with the images is lost after after the GPA even if they
were correctly rescaled).
2) Save aligned specimens (nts) and CS.
3) Rescale manually in xls results from 2) (CS by aligned column by column).
4) Compare results from 1) with those from 3) (redo the GPA, do a matrix
corr. of Procrustes distances pairwise - r should be 1; plot CS from 3)
vs 1) and check that they are virtually identical etc.).
Good luck.
Cheers
Andrea
On 14/03/2021 05:57, Andrés Felipe Garzón Agudelo wrote:
Hello everyone, I have a couple of questions about tpsRelw and MorphoJ that
I hope someone could answer.
I performed a GPA with sliding semilandmarks in tpsRelw v 1.71, after that,
my intention was to proceed with the analysis in MorphoJ. So, I saved the
"Scaled aligned specimens" file in order to import the shape and size
information in MorphoJ. But I found something odd at this point. I saved
the "Scaled specimens" in .tps and .nts formats and the values of the
coordinates are different in the two files (i think this may be a bug).
The coordinates in the .nts file seem to make more sense, however, I don't
understand where they come from. I thought they simply would be equal to
the coordinates in the "aligned specimens" file multiplied by the centroid
size values. Could someone explain this to me?
Then I continued using the .nts file in MorphoJ. I did another GPA and
exported the centroid size values to compare them with the ones I got in
tpsRelw. They are very different and I don't understand why.
I would appreciate your comments on this. I attach the files I mentioned in
case anyone wants to take a look at them.
Best,
Felipe Garzón
GPA parameters used in tpsRelw:
- PCA align reference
- Slide semilandmarks by Chord-min BE
- Scale aligned---1
- Projection---None
- Alignment---Procrustes
--
Dr. Andrea Cardini
Researcher, Dipartimento di Scienze Chimiche e Geologiche, Università di
Modena e Reggio Emilia, Via Campi, 103 - 41125 Modena - Italy
tel. 0039 059 4223140
Adjunct Associate Professor, Centre for Forensic Anthropology, The
University of Western Australia, 35 Stirling Highway, Crawley WA 6009,
Australia
E-mail address: [email protected], [email protected]
WEBPAGE: https://sites.google.com/view/alcardini2/
or https://tinyurl.com/andreacardini
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https://tinyurl.com/yellowmorphobook
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