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TitleEffect of Atmospheric Correction and Viewing Angle Restriction on AVHRR Data Composites
AuthorCihlar, J; Huang, F
SourceCanadian Journal of Remote Sensing 20, 2, 1994 p. 132-137
Alt SeriesEarth Sciences Sector, Contribution Series 20041205
Alt SeriesRESORS 1101416
Mediapaper; on-line; digital
File formatpdf
AbstractThis paper discusses the effect of two processing parameters on 10-day composites of AVHRR data prepared using a maximum NDVI criterion, namely correction for atmospheric effects and constraining the maximum permissible satellite viewing angle. Images of Canadian landmass from two growing season periods were used. It is found that atmospheric correction carried out prior to compositing increased residual bidirectional effects by selecting pixels from higher viewing angles. The combined effect of atmospheric correction and angular constraint also shifted selected pixels to higher viewing angles (especially backscatter), at the expense of high forescatter and high backscatter angles. The results thus indicate that if bidirectional reflectance effects are to be reduced in the final composites, atmospheric corrections should be performed after the compositing step. Combining atmospheric correction with angular restriction for compositing is an undesirable option because of the shift to higher view zenith angles and the increased probability of cloud contamination, in addition to a more likely appearance of edges from adjacent input images in the composite.

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