Plot discrete colormap

[YosmelyBermudez]

Hello! I need to plot a seismic horizon, and the variables are inline, xline, time and preditions, where predictions are values ​​from 0 to 3 and they will be specified in a colorbar. Attached image. How can I specify the axes? How can I plot this image? Notice that the colors of the colorbar are not in the image yet, it is just what I have in mind.

[ahuang11]

https://stackoverflow.com/questions/53360879/create-a-discrete-colorbar-in-matplotlib

or
http://holoviews.org/user_guide/Styling_Plots.html