stem3(X, Y, Value)
[Xm,Ym] = ndgrid(X,Y);
Vm = griddata(X, Y, Value, Xm, Ym);
contour3(Xm, Ym, Vm)
I used contour3 here to demonstrate the problems. Experiment with surfc and contour.
Your data do not easily lend themselves to a contour plot. You will need to work with your data a bit to get a better representation.