Roughness | Roughness Length m | Energy Index % | Landscape Type |
0 | 0.0002 | 100 | Water surface |
0.5 | 0.0024 | 73 | Completely open terrain with a smooth surface, e.g. concrete runways in airports, mowed grass, etc. |
1 | 0.03 | 52 | Open agricultural area without fences and hedgerows and very scattered buildings. Only softly rounded hills |
1.5 | 0.055 | 45 | Agricultural land with some houses and 8 meter tall sheltering hedgerows with a distance of approx. 1250 meters |
2 | 0.1 | 39 | Agricultural land with some houses and 8 meter tall sheltering hedgerows with a distance of approx. 500 meters |
2.5 | 0.2 | 31 | Agricultural land with many houses, shrubs and plants, or 8 meter tall sheltering hedgerows with a distance of approx. 250 meters |
3 | 0.4 | 24 | Villages, small towns, agricultural land with many or tall sheltering hedgerows, forests and very rough and uneven terrain |
3.5 | 0.8 | 18 | Larger cities with tall buildings |