| Terrain
Roughness |
| Zo
(m) |
| Classification |
| Description |
| .0002 |
| Very smooth |
| Water,pavement |
| .03 |
| open |
| Prairie or farm |
| .25 |
| Rough |
| High crops |
| .5 |
| Very rough |
|
|
| Scattered |
|
| bldgs/orchards |
|
| >2 |
| Chaotic |
| Towns/forests |