Investigation on the dynamics of artificial surface reflectance under field condition

Reflectance of typical artificial surfaces, such as road and roof is usually believed to be invariant in a short period of time due to their physical and chemical stability. To examine its variability, reflectance of asphalt, concrete, walkway slab, asphalt roof paper and color plate is measured using dual-beam method. A preprocessing procedure is performed to remove possible errors caused by non-target factors. Measurement results show that reflectance of these targets are relatively stable when sun elevation condition is large and change rapidly when sun elevation is close to 0 °. This result provides useful information about reflectance variation of typical urban surfaces under changing field condition and may benefit reflectance modeling studies on similar targets.