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ASAS nadir-view image acquired in solar principal plane 19-June-1990 (09:38 local time) over ponderosa pine site, Oregon Transect. |
| Mean bi-directional reflectance factors (BRF) per stand, per view zenith angle. Greater chlorophyll absorption (around ~550-700 nm) and BRF anisotropy (throughout) observed in dense stand. | |
| Normalized Difference Vegetation Index (NDVI) shows sensitivity to view zenith angle in dense stand, yet is relatively constant in sparse stand. |
- BRF shape and anisotropy both influenced by stand structure.
- Off-nadir NDVI biased (vs. nadir) in denser stands.