Error Analysis of Retrieved Aerosol Optical Depth Due to Adjacency Effect for ROCSAT-2 RSI Bands

The adjacency effect (AE), caused by the scattering of reflected radiance from an inhomogeneous surface, is known to introduce a blurring effect on remotely sensed data, especially for high spatial resolution data. The retrieval of aerosol optical depth (AOD) by the dark target (DT) method usually n...

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Bibliographic Details
Published in:TAO : Terrestrial, atmospheric, and oceanic sciences atmospheric, and oceanic sciences, 2005-03, Vol.16 (1), p.241-250
Main Author: 劉建慧(Chien-Hui Liu)
Format: Article
Language:English
Subjects:
Aerosol effects
Aerosol models
Aerosol optical depth
Aerosols
Airborne particulates
Atmospheric correction
Atmospheric models
Blurring
Error analysis
Errors
Industrial areas
Optical analysis
Radiance
Reflectance
Remote sensing
Resolution
Retrieval
Sky
Spatial data
Spatial discrimination
Spatial resolution
Spectral bands
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Summary:The adjacency effect (AE), caused by the scattering of reflected radiance from an inhomogeneous surface, is known to introduce a blurring effect on remotely sensed data, especially for high spatial resolution data. The retrieval of aerosol optical depth (AOD) by the dark target (DT) method usually neglects the AE. Hence, significant errors may be induced in aerosol retrieval. In this study, the errors of retrieved AOD due to AE by the DT method for very high spatial resolution data of 8 m in the multi-spectral bands of ROCSAT-2 RSI are investigated. A fast, accurate simple atmospheric correction model is applied. Target size is considered the same as the spatial resolution. The errors are mainly studied for both low and medium contrasts, in both clear and hazy skies for both continental and urban aerosol models. The results indicate that for the continental model, AE may cause significant retrieval errors for AOD over DTs for medium contrast in both skies in blue and red bands. Error becomes negligible if the inhomogeneous surface is for low contrast in clear sky. It is larger for the urban model where there is more absorption than for the continental model, due to the less sensitivity of top-of-atmosphere reflectance to AOD for DTs in inhomogeneous surfaces. This suggests that AE be considered for medium contrast in both skies, especially for urban-industrial regions for ROCSAT-2 RSI.
ISSN:1017-0839
2311-7680
DOI:10.3319/TAO.2005.16.1.241(A)