| Title | Effect of Atmospheric Correction and Viewing Angle Restriction on AVHRR Data Composites |
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| Author | Cihlar, J; Huang, F |
| Source | Canadian Journal of Remote Sensing 20, 2, 1994 p. 132-137 |
| Year | 1994 |
| Alt Series | Earth Sciences Sector, Contribution Series 20041205 |
| Alt Series | RESORS 1101416 |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Abstract | This 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. |
| GEOSCAN ID | 218007 |
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