How to reshape latitude, longitude and data of not regularly-spaced vectors into 2-D matrix to plot a pcolorm?

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I have latitude, longitude and data vectors of size 7631 that are not equally spaced.
I want to plot a pcolorm of the data at the given latitude and longitude.
Since my data is not regularly-spaced I have a hard time being able to do a pcolorm.
I thought it would work with latitude, longitude and data as vectors but it does not work properly.
I am converting data from a x-y grid to a lat-lon grid. I want to reproduce the figure on the x-y grid below on the geo-referenced map.
% Load latitude, longitude & data
ncpolarm('lat',66); hold on;
%pcolorm(latitude,longitude,data); %NOT WORKING
Figure on my original x-y grid that I want to convert on a georeferenced map:
Georeferrenced map on which I want to do a pcolorm of my data.
Thank you

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