Pole figure as dots with one point per grain information

[Rhander Altoé]

Hey guys, 

I have some EBSD data of five quartz porphyroclasts from which I want to extract CPO information and view it as dots in pole figures with one point per grain. I've been using the following code:

%%%% Create list of pole figures - Quartz      

%**************************************************************************

% Classically in MTEX you cannot mix hkls and uvws

% pole to planes can be specified by the option 'pole' or 'hkl' 

% directions are specified by the option 'uvw' 

%

PFs_Plag_hkil = [ ...

    Miller(0,0,0,1,ebsd('Quartz').CS,'hkil'),...

    Miller(1,0,-1,0,ebsd('Quartz').CS,'hkil'),...

    Miller(1,0,-1,1,ebsd('Quartz').CS,'hkil'),...

    Miller(0,1,-1,1,ebsd('Quartz').CS,'hkil'),...

    ]

PFs_Plag_uvtw = [ ...

    Miller(-1,2,-1,0,ebsd('Quartz').CS,'uvtw'),...

    ]

 

%%

 

%plot the discrete pole figure 

figure

plotPDF(ebsd('Quartz').orientations,PFs_Plag_hkil,'noSymmetry',all,'antipodal','MarkerFaceColor','black','markersize',2); 

However, this code gives me all indexed points from the EBSD data and the pole figures show thousands of points. Does anyone know how to calculate the pole figure as dots using one point per grain? 

Cheers, 

Rhander.

[Grafulha Morales Luiz]

Hi Altoe

One way is to calculate grains first, than plot the meanOrientation of those grains, check here

https://mtex-toolbox.github.io/GrainReconstruction.html

Hope this helps

Cheers

Luiz

Luiz F. G. Morales

ScopeM - ETH Zürich 

Sent from iPhone

On 24 Jun 2020, at 22:45, Rhander Altoé <rhande...@gmail.com> wrote:



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[Rhander Altoé]

Oi Luiz, 

Thanks for the hint. After calculating the grains (calcGrains) and removing small pixels, I successfully generated the pole figures as you suggested (meanOrientation) using the grain variable:

plotPDF(grains('Quartz').MeanOrientation,PFs_Plag_hkil,'noSymmetry',antipodal','MarkerFaceColor','black','markersize',2);

Now the pole figures show the orientation of the five quartz porphyroclasts as one point per grain (dots).

Abraço, 

Rhander.

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[Luiz F. G. Morales]

Oi Altoé

Que bom que funcionou :-)

abraco

Luiz

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Luiz F. G. Morales
ETH Zürich

Structural Geology and Tectonics Group

Scientific Center for Optical and Electron Microscopy (ScopeM)
HPM D 47
Otto-Stern-Weg 3
8093 Zurich, Switzerland
Phone +41 44 633 37 46

Email: luiz.m...@scopem.ethz.ch