Urban Aerodynamic Roughness Length Mapping Using Multitemporal SAR Data

Figure 11

The ALOS PALSAR image on 27 April 2010 and the retrieved aerodynamic roughness length. (a) The ALOS PALSAR image, (b) the retrieved aerodynamic roughness length in the 30° direction, and (c) the retrieved aerodynamic roughness length in the 330° direction. The arrow indicates the wind direction, that is, the central angle of the upwind sector. Stars A and B indicate two examples of aerodynamic roughness estimation.

(a) ALOS PALSAR image on April 27, 2010 (the same extent with Figure 1(a))

(b) The map in the 30° direction (with the opening angle 15–45°)

(c) The map in the of 330° direction (with the opening angle 315–345°)