Re: [MORPHMET] Looking for software to place landmarks on 3d data

[Vera Moitinho]

Dear Grace,

I'm sending you the link to download Landmark software + manual
.
This version of the software used to work well.
Hope this helps!

Best,
Vera


On Tue, May 2, 2017 at 6:53 PM, Grace C.  wrote:

> Hi all,
>
> I am attempting to analyze 3D data reconstructed from CT scans (.ply
> files). Can anyone recommend a program to help me place landmarks on these
> data?
>
> I tried to download Landmark Editor, but it seems like the download links
> on the IDAV website are no longer functioning. I found an archived version
> of the software online, but it constantly crashes when I import my data. Is
> this the only free software that can be used to apply landmark points to 3D
> data?
>
> Thanks in advance!
> - Grace
>
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[MORPHMET] Re: Looking for software to place landmarks on 3d data

[terrielsimmons]

Hi Grace,

You can use 3D Slicer or Meshlab to place points on 3D models--both are 
free.

Terrie

On Tuesday, May 9, 2017 at 7:26:04 AM UTC-4, Grace Capshaw wrote:
>
> Hi all, 
>
> I am attempting to analyze 3D data reconstructed from CT scans (.ply 
> files). Can anyone recommend a program to help me place landmarks on these 
> data? 
>
> I tried to download Landmark Editor, but it seems like the download links 
> on the IDAV website are no longer functioning. I found an archived version 
> of the software online, but it constantly crashes when I import my data. Is 
> this the only free software that can be used to apply landmark points to 3D 
> data? 
>
> Thanks in advance! 
> - Grace

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[MORPHMET] number of landmarks and sample size

[Lea Wolter]

Hello everyone,

I am new in the field of geometric morphometrics and have a question for my 
bachelor thesis.
 
I am not sure how many landmarks I should use at most in regard to the sample 
size. I have a sample of about 22 individuals per population or maybe a bit 
less (using sternum and epigyne of spiders) with 5 populations. 
I have read a paper in which they use 18 landmarks with an even lower sample 
size (3 populations with 20 individuals, 1 with 10). But I have also heard that 
I should use twice as much individuals per population as land marks... 

Maybe there is some mathematical formula for it to know if it would be 
statistically significant? Could you recommend some paper?

Because of the symmetry of the epigyne I am now thinking of using just one half 
of it for setting landmarks (so I get 5 instead of 9 landmarks). For the 
sternum I thought about 7 or 9 landmarks, so at most I would also get 18 
landmarks like in the paper. 

I would also like to use two type specimens in the analysis, but I have just 
this one individual per population... would it be totally nonesens in a 
statistical point of view?

Thanks very much for your help!

Best regards
Lea

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