This is a before and after of a very small TIN model, plus contour lines and elevations I did in Adobe Illustrator. The cluster of elevations was given and I laid out the triangles, contour lines and elevation labels in Illustrator CC 2017.
Contour Lines
![](https://i0.wp.com/rgbwebdev.com/wordpress/wp-content/uploads/2017/04/contourlines.png?fit=1200%2C1152)