Hi all,

Related question to this.
I am trying to extract vertexwise surface area values in an ascii files. For that I am doing

mri_surf2surf --hemi ?h --srcsubject <subject dir> area --src_type curv --trgsubject fsaverage --trgsurfval XYZ-area --trg_type curv
mris_convert -c XYZ-area ?h.white XYZ-area.asc

However I am getting surface area values for some vertices as negative.
1) Am I following correct steps while writing vertex-wise values in ascii files?
2) Aren't values of surface-area supposed to be non-negative?

I am not sure what I am missing here. For some reason I am not able to post questions to freesurfer support list by myself.

Thanks for the help.

-Sabin

On Friday, April 11, 2014 3:18 PM, Jonathan Holt <whatsdac@umich.edu> wrote:

I’m trying to find a way to extract thickness values at each vertex for a given subject, and as a part of that process I need to ensure that each subject has been mapped to a common area, such that their vertices have a direct correspondence, but I’m not entirely sure how to go about it.

I’ve started with mris_preproc but the output is an mgh, which I’m not sure is useful for my endeavor.
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