50
Fig. 2.7 The height scale of thermal measurements in a densely built-up area
Fig. 2.6 Thermal and humidity measures on the horizontal scale in a densely built-up area
• In the Urban Canopy Layer there is little variation in temperature with height,
while there is a discontinuity near roof level both horizontally and vertically.
Consequently, if a meaningful spatial average is sought, sensors should be well
above mean roof level. The recommended height is >1.5z H (where z H is mean
height of the roughness elements), so that the mixing of roof and canyon air is
accomplished (see Fig. 2.7).
G. Baranka et al.