Influences of the window size of moderate resolution imaging spectroradiometer (MODIS) aerosol optical thickness (AOT) values on particulate matter (PM10) motoring in Klang Valley, Malaysia

摘要

Remote sensing has been shown to be a useful tool inretrievalaerosol optical thickness (AOT) in particulate matter (PM) pollution monitoring.In this study, daily AOT data retrieved frommoderate resolution IMAGING spectroradiometer(MODIS) and the amount of PM10measured at eight air quality monitoring ground stations in Klang Valley from 2004 to 2006 were used. The AOT values consisted of three different average window sizes (WS):(3 × 3) pixels, (5´5) pixels and (7 × 7) pixels.PM10mass concentrationconsists of real-time(hourly) and 24 h mean.Linear correlation coefficients (LCC) were used to determine thebest validation result. Bestvalidation results were obtained between AOT WS in (5× 5) pixels and PM10mass in 24 h mean.The LCCs in dry season were acquired higher than those in rainy season.The validation results in rainy season were improved when nonlinear correlation coefficients (NLCC) with polynomial equation were used for analysis.This study reveals that the correlation coefficients are dependent on time and location.