| Autor: |
Rees, W. G., Steel, A. M. |
| Předmět: |
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| Zdroj: |
International Journal of Remote Sensing; 10/20/2001, Vol. 22 Issue 15, p3015-3026, 12p, 1 Black and White Photograph, 2 Diagrams, 3 Charts, 1 Graph |
| Abstrakt: |
This paper presents a quantitative investigation of the relative importance of variations in incidence angle, land cover type, month of the year, and the presence or otherwise of a wet snow cover, in modulating the C-band VV backscattering coefficient from upland terrain in Scotland. We show that, provided the contributions from incidence angle and land cover are modelled, the uncertainty in a backscatter measurement can be reduced to approximately 1 dB. At this level of precision, a difference can be observed from a snow-covered area in the case of heather and rough grass, the two dominant upland vegetation types. Over heather-covered areas, a wet snow cover typically reduces the backscatter by 2 dB whereas over rough grass it is increased by about 1 dB. Densely forested areas exhibit no significant change in backscattering coefficient as a result of a wet snow cover, a result in accordance with previous research. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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