| Autor: |
Sylvain G. Leblanc, Petri Pellikka, D. J. King |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Remote Sensing Reviews. 19:259-291 |
| ISSN: |
0275-7257 |
| DOI: |
10.1080/02757250009532422 |
| Popis: |
Bidirectional effects in airborne remote sensing data are governed by land surface reflectance characteristics, atmospheric scattering and the sun‐object‐sensor angular relationship. These factors introduce brightness variations in the data that render quantitative analysis more difficult. On the other hand, bidirectional reflectance distribution functions (BRDF) of land surfaces provide information about the physical characteristics of the surface. This study has two objectives. The first is to reduce brightness variations in aerial false colour imagery using empirical methods. The second is to test if bidirectional effects must be modelled using sample data only for the land surface type under analysis or can another surrogate land cover type, which may be easier to sample in the imagery, be used. The method is based on multiple view angle imaging of two reference land surfaces using highly overlapping stereo frame format imagery. Reduction of BRDF effects includes derivation of a quantification factor ... |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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