What is top of atmosphere correction?
Top of Atmosphere (TOA) Reflectance is a unitless measurement which provides the ratio of radiation reflected to the incident solar radiation on a given surface. It that can be computed from satellite measured spectral radiance using the mean solar spectral irradiance and the solar zenith angle.
What is top of atmosphere radiance?
Radiance, Reflectance, and Top of Atmosphere (TOA) Radiance includes the radiation reflected from the surface, in addition to the radiation that bounces in from neighboring pixels, and the radiation reflected from clouds.
Which is the best method for Atmospheric correction?
Vanhellemont (2019) has published a new atmospheric correction method dedicated for aquatic applications. Atmospheric correction, cloud screening, and modeling of the bidirectional reflectance distribution are essential requirements for accurate inference of surface properties from optical satellite remote sensing.
Is the black water method used in atmospheric correction?
Even if the great majority of those algorithms relies on the “black” water method in the near infrared described above (i.e. the radiation exiting the water is nil), each algorithm has its own features according to the technical specifications of the sensor to which it will have to apply.
How are SWIR reflectance used in atmospheric correction?
Aquatic atmospheric correction algorithms assume any SWIR reflectance to be from atmospheric aerosols and subtract it from the total radiance spectra (on top of atmospheric radiance) obtained by satellites during the aerosol removal step.
Why is atmospheric correction difficult over inland water?
Atmospheric correction of satellite measurements over inland water is challenging due to many factors. Some of the major challenges include terrestrial atmospheric pollution, high turbidity, floating objects, and the adjacency effect of neighboring land pixels, which significantly raise the reflectance of water.
https://www.youtube.com/watch?v=DxeiP4b9OxE