Development Of A Terrestrial Aerosol Measurements Using Digital Cameras
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Date
2016-09
Authors
Wong, Chow Jeng
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Abstract
Atmospheric aerosols with diameters less than 10 μm (PM10) are a major component of air pollution that threatens our health and our environment. Currently, distribution of air quality monitoring stations does not provide enough coverage for all areas. In addition, the public does not have direct nor immediate access to air quality information in order to take precaution against long exposure to high concentrations of atmospheric aerosols. The aim of this study is to develop a terrestrial aerosol measurement using the digital camera to determine the concentration of PM10. Five digital cameras with different sensor types, sensor resolutions and sensor sizes were used as the remote sensing sensors in this study. The radiometric response function for these five digital camera sensors have been determined and used to measure the irradiance recorded in digital photographs. A newly developed algorithm was used to convert the multispectral pixel values acquired from the five different digital cameras into quantitative values of PM10 concentration. As the PM10 concentration increases, the reflectance of the diffused sunlight which interacted with the atmospheric aerosols also increases. This algorithm was developed based on the regression analysis of the measured PM10 concentration and the reflectance of the diffused sunlight which interacted with the atmospheric aerosols. The measured PM10 concentration values from this algorithm had been validated by correlating it with the PM10 concentration values measured by a DustTrakTM meter. The results of this study showed that the newly developed algorithms applied to the respective digital cameras, produced a high correlation coefficient (R2) and low root-mean-square error (RMS) between the DustTrakTM meter measurements and the estimated PM10 concentration measurements
by the digital cameras. Both the DSLR cameras have the highest accuracy in determining PM10 concentration whereby the CCD DSLR camera has the value of R2 = 0.8304, RMS = 16.0 and the CMOS DSLR camera has the value of R2 = 0.8424, RMS = 17.0. Future work can be replicated by using different types of mobile phone cameras.
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Develop a terrestrial aerosol measurement using the digital camera , to determine the concentration of PM10.