ausblenden:
Schlagwörter:
-
Zusammenfassung:
Atmospheric aerosols affect the absorption and dispersion of light through the atmosphere. The role of aerosols on accurate satellite images is generally expressed by the trajectory of the modulation transfer function (MTF) of aerosols. In this research, the MTF of aerosols has been estimated under different weather conditions in the atmosphere of Tehran, in Iran, for some case studies during 2021. The main aim of this research is to provide a model to be used for different times and weather conditions in the Tehran urban area. This will need for the accurate design of the cargo and the selection of the sensor and channel. The required meteorological data were derived from the European Center for Weather Forecasting (ECMWF) and radiosonde data. The small angle approximation (SAA) method has been used to estimate the MTF of aerosols. The results for three different modes of the dominant aerosols including dust, urban aerosols, and the combination of both types, show that in a hypothetical imaging system, at the Nyquist frequency, the MTF value varies from the minimum of 0.5 in autumn to 0.65 in summer. This drastic change is probably caused by the increase in air pollution in Tehran during mid-autumn and the dominance of urban aerosols.
