Variations in solar irradiance caused by solar cycle affect the temporal stability of ETM+ (LS7) ToA reflectance values at pseudo-invariant calibration sites (PICS)

The aim of this study is to quantify the impact of the effect of long-term solar cycle variations in solar irradiance on the accuracy and temporal stability of ToA reflectance values from Enhanced Thematic Mapper Plus (ETM+/L7) sensor images. We used 1382 ETM+ scenes corresponding to five Pseudo-Inv...

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Bibliographic Details
Published in:International journal of remote sensing 2024-08, Vol.45 (16), p.5530-5543
Main Authors: Müller, Jonathan Gil, Vibrans, Alexander Christian
Format: Article
Language:English
Subjects:
Accuracy
Atmospheric correction
Calibration
Image enhancement
image pre-processing
Invariants
Irradiance
Optical remote sensing
Radiometric correction
Reflectance
Solar cycle
Solar effects
Solar irradiance
solar radiation
Solar spectra
Spectral bands
Spectral Irradiance Monitor (SIM)
Stability
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Summary:The aim of this study is to quantify the impact of the effect of long-term solar cycle variations in solar irradiance on the accuracy and temporal stability of ToA reflectance values from Enhanced Thematic Mapper Plus (ETM+/L7) sensor images. We used 1382 ETM+ scenes corresponding to five Pseudo-Invariant Calibration Sites (PICS), obtained between 2003 and 2020. Solar irradiance data from the Spectral Irradiance Monitor (SIM/SORCE) were used to calculate daily values of mean exoatmospheric solar irradiance (ESUN), implemented in the radiometric correction of ToA reflectance. Enhanced temporal stability coefficients and variance tests were calculated to evaluate the stability of the time series obtained. The results indicate that the use of daily SIM/SORCE solar spectra has a significant impact (alpha 0.05). We concluded that considering the effects of solar cycles during the radiometric calibration of multispectral sensors contributes to improving the long-term stability of ToA reflectance products.
ISSN:0143-1161
1366-5901
DOI:10.1080/01431161.2024.2371085