Terrain Modelling from contour lines in Rhino - Tutorial

This video tutorial goes through the step of how to create a 3d terrain model from a series of contour lines in Rhino. I have included the timestamps below so you can skip ahead to any relevant sections:

0:20 - Vertically spacing out the contour lines
2:28 - Using the Patch command to apply a surface over the top of our contour lines
3:10 - Patch surface options and terrain accuracy
5:20 - Trimming the edges of the terrain to match the site
6:05 - Making the terrain surface into a 3d object