جستجوی مقالات مرتبط با کلیدواژه « atmospheric correction » در نشریات گروه « عمران »
تکرار جستجوی کلیدواژه «atmospheric correction» در نشریات گروه «فنی و مهندسی»-
A fuzzy predictive model is The atmospheric gases, aerosols and clouds scatter and absorb solar radiation and can modulate the reflected radiation from the earth. Therefore, the atmosphere contributes to the at-sensor radiance. So, one of the requirements for extracting reliable spectral information is to first compensate for atmospheric effects. Therefore, Atmospheric correction is a most important preprocessing step required in many remote sensing applications. There is a plethora of methods available, from simple to complex, which addresses correction and calibration issues. Some of the most accurate and severe methods are physically-based models, which require atmospheric data coincident with remote sensing data acquisition. Preparation of these data is difficult and expensive. In this study, a physical based algorithm proposed which provide partial information about atmosphere from GPS radio occultation profile. The method is provided to two global steps: in first step, atmospheric parameters are calculated using radiative transfer model. Then, in second step, calculated parameters are used for atmospheric correction. The results of the atmospheric correction process are evaluated by checking the level of spectral information using entropy criterion and comparing the computed at-surface reflectance with in-situ surface reflectance measurements. The results show the improvement of atmospheric corrected surface reflectance based on GPS radio occultation. Also, the information content criterion shows higher spectral content in images resulting from the proposed method.Keywords: Atmospheric Correction, Radiative Transfer Code, surface Reflectance, MODTRAN Code}
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Due to absorption and scattering by gases and aerosols, the reflected radiance from ground surface changes when passing through the atmosphere before getting captured by the remote satellites. The absolute image atmospheric correction is the prepossessing step that reducesatmospheric effects. These corrections improve satellite image quality and increase processing performance of such images. Many absolute image atmospheric correction methods use radiative transfer code procedures. In this paper, the potential of two well-known code 6S and MODTRAN5 in absolute imageatmospheric correction of TM images was studied. Atmospheric correction results investigated via visual inspection of Top of Atmosphere (TOA) and surface reflectance values were extracted by two methods.Also the quantity of information variation in spectral images was investigated by Entropy, Range and Standard deviation criteria. The results clearly show that correction of atmospheric effects in visible spectrum and infrared spectrum appears with negative and positive signs respectively. Also the differences between utilized codes illustrated in surface reflectance were observed in infrared spectrum. Moreover, both codes (6S and MODTRAN5) improve quality of imageregarding TOA reflectance image with 12% and 23% in Mean Range and 5% and 6% in Entropy respectively.Keywords: Atmospheric correction, 6S code, MODTRAN5 code, Surface reflectance, TOA}
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