# Landmarking/Semi-Landmarking Query

**URL:** <https://discourse.slicer.org/t/landmarking-semi-landmarking-query/42690>\
**Category:** SlicerMorph\
**Created:** [April 25, 2025, 4:18pm UTC](https://discourse.slicer.org/t/landmarking-semi-landmarking-query/42690 "2025-04-25T16:18:57Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![elg67](https://avatars.discourse-cdn.com/v4/letter/e/ecb155/32.png) [@elg67](https://discourse.slicer.org/u/elg67)\
**Post date:** [April 25, 2025, 4:18pm UTC](https://discourse.slicer.org/t/landmarking-semi-landmarking-query/42690/1 "2025-04-25T16:18:57Z")

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![155432_craniumsemilandmarks](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/0/2/0265be97552acb2e1167dcf96b9ca84f6a1e4947.jpeg)  
 ![155432_shouldergirdlesemilandmarks](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/2/8/285768e4f92a850ea95e5ac5ef3df46dd5f86630.jpeg)  
 ![155432_pelvissemilandmarks](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/9/4/94e84a8c606ed96784a867b7bc4d1d6fedcc83a1.jpeg)

Hiya! I’m currently trying to place landmarks on crania, scapulae, clavicles and pelvises to analyse co-variation in shape. I’ve placed landmarks manually on all samples and have started creating semi-landmarks between points using the curve function (as I didn’t think the PseudoLM generator gave an accurate representation of the shape). Is there any way I could perform a General Procrustes Analysis/compare the landmark position between samples on these points using 3DSlicer?

(Fixed landmarks are magenta, Semi-Landmarks are salmon pink)

Thanks!

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [April 25, 2025, 4:31pm UTC](https://discourse.slicer.org/t/landmarking-semi-landmarking-query/42690/2 "2025-04-25T16:31:52Z")

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Labels are in the way, so I can’t quite tell what your lms are. Regardless, there is GPA module in SlicerMorph that you can use. Note that it doesn’t do the sliding of the semiLMs.