How to plot XYZ data, so that the Z-components are plotted as large 'pixel' and have a color corresponding to their value.

I have XYZ data where X and Y are arranged in a grid like order. I want to plot the Z values, so that each position is represented by a large 'pixel' that has a color that corresponds to the Z value.

In the attached picture you can see something similar to what I want that I achived by creating a meshgrid that has an offset to the XY positions by 0.5*gridsize and using griddata to interpolate the values. Using surf and view(2), I can plot something similar to what I want, but it is actually an interpolation of the meshgrid positions and thus not exactly what my data shows. Also I want the 'pixels' only where I actually have a measurement. I could use 'linear' method in griddata instead of 'v4' but then I would not have measurements at the outermost points. The small red dots are the meshgrid positions, the white x the actual XY positions and the surface the plotted output of surf.

The code to generate the figure:

    [xg,yg] = meshgrid((min(x)-0.5*delta_x):delta_x:(max(x)+0.5*delta_x),...
    (min(y)-0.5*delta_y):delta_y:(max(y)+0.5*delta_y));
    v = griddata(x,y,z,xg,yg,'v4')

    figure(1); hold on;
    plot3(x,y,z, 'wx')
    surf(x,y,v)
    axis equal;
    view(2);

Answer 1

[dpb]

Try

scatter(x,y,25,z,'filled')

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