Unfortunately, a glaring weakness in Matlab plotting functions is surface plots directly from scattered data...you'll have to try to interpolate enough to grid it to use any of the builtins (in base product, anyway, there could be something in some toolbox I'm unaware of).
There's example at https://www.mathworks.com/help/matlab/visualize/representing-a-matrix-as-a-surface.html bottom half of page. Good luck.
If you have access, TecPlot is much more powerful in this regard.
