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Figure 4: Measured BRDF values in the principal plane at cross-polarization. Within a row the incident zenith angle fj W 
was varied, the rows differ in measured polarization state (sp resp. ps) and measured sample. Measurements are indicated e 
by error-bars, the solid line gives the result of a lambertian assumption (seperately fitted constants aS”, af’ for each eT 
sample). Negative viewing zenith angles correspond to backward scattering direction. 9 
  
782 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B3. Amsterdam 2000.