Title :
Deriving the anisotropic atmospheric point spread function of ASAS off-nadir images and removal of the adjacency effect
Author :
Hu, Baoxin ; Li, Xiaowen ; Strahler, Alan H.
Author_Institution :
Dept. of Geogr., Boston Univ., MA, USA
Abstract :
Because of its off-nadir viewing, the Advanced Solid-State Array Spectroradiometer (ASAS) presents a new challenge for atmospheric correction. One of the main differences between the atmospheric effect on nadir and off-nadir observations is the adjacency effect. To remove the adjacency effect on 45° viewing ASAS images, we extracted a first-order analytic approximation of the atmospheric point spread function (PSF) using the relationship between the physical quantities and the geometry of the sensor, target pixel and environmental pixel. The correction results by a Wiener filter based on the PSF demonstrate that this method of removing the adjacency effect is feasible and effective
Keywords :
Wiener filters; atmospheric optics; atmospheric techniques; geophysical signal processing; image processing; optical transfer function; remote sensing; ASAS off-nadir images; PSF; Wiener filter; adjacency effect; anisotropic atmospheric point spread function; atmospheric correction; environmental pixel; first-order analytic approximation; nadir observations; off-nadir observations; sensor geometry; target pixel; Anisotropic magnetoresistance; Atmosphere; Atmospheric modeling; Computer vision; Pixel; Remote sensing; Scattering; Sensor phenomena and characterization; Spectroradiometers; Wiener filter;
Conference_Titel :
Geoscience and Remote Sensing Symposium, 1996. IGARSS '96. 'Remote Sensing for a Sustainable Future.', International
Conference_Location :
Lincoln, NE
Print_ISBN :
0-7803-3068-4
DOI :
10.1109/IGARSS.1996.516739
