Vz = Vg (z/zg)^α
Vz = Kecepatan angin di ketinggian tertentu (dicari)
Vg = Kecepatan angin di ketinggian referensi
z = Ketinggian titik ukur yang dicari
zg = Ketinggian titik ukur referensi
α = Konstanta
| Terrain category | Terrain description | Gradient height (m) | Roughness length (m) | Mean speed exponent (α) | Gust speed exponent (β) |
| 1 | open sea, ice, tundra, desert | 250 | 0.001 | 0.11 | 0.07 |
| 2 | open country with low scrub | 300 | 0.03 | 0.15 | 0.09 |
| 3 | suburban area, small town | 400 | 0.3 | 0.25 | 0.14 |
| 4 | city centres, tall buildings | 500 | 3 | 0.36 | 0.2 |
Sumber : Architectural Aerodynamics, Aynsley
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