International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B1. Istanbul 2004 
  
Wavelngth = 0.8 micron - PBU4 
View Zenith Angle 
     
0.0 100 200 300 400 500 600 700 
Illumination Zenith Angle 
Figure 8. Contour plot of directional reflectance versus 
illumination and viewing angles at 0.8 um for PBU4 sand. 
6. CONCLUDING REMARKS 
In this paper a set of laboratory multiangular observations have 
been presented in order to retrieve BRDF of sand. A detailed 
description of the developed instrument has been given with 
particular reference to the calibration procedure to take account 
for the angular behaviour of the white standard employed as 
reference measurement. 
The need to improve the modelling of BRDF of natural surface 
has arisen from the analysis of preliminary results, together with 
the possibility to consider a not collimated radiation source and 
to extend the range of viewing zenith angles. 
Future investigations will regard the effects of atmosphere on 
the retrieval of reflectance from multiangle remote sensing data. 
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