Urban Aerodynamic Roughness Length Mapping Using Multitemporal SAR Data

Figure 1

The study area of Beijing city. (a) shows the Gaofen image of Beijing city (8 m resolution) on 12 October 2015; (b) shows the area around the Beijing meteorological tower (14 km × 14 km), where the white star represents the position of the meteorological tower, the red circles illustrate various dimension settings of the upwind sector, and the green lines intersecting with the red circles represent the upwind sectors with the opening angle of 30°, the central angle of 25°, and the various radii of 1000 m, 3000 m, 5000 m, and 7000 m.