spatial resolution for a pixel is a 6 x 7 km? at nadir. The 
POLDER has nine spectral channels, namely 443, 443P, 
490, 565, 670P, 763, 765, 865P, 910 nm. The 443P, 670P 
and 865P means polarized channels (Deschamps et al., 
1994). 
In this paper, POLDER's 1-path data set (level-1 
products) are analyzed. This product is corrected based 
on POLDER grid coordinates with 6.2 x 6.2 km? spatial 
resolution. Figure 2(a) shows a single satellite path 
image called the "1-path image" which was obtained on 
November 18, 1996 (Path #287). This image is produced 
by Mex. Mex is a very convenient graphics tool for 
POLDER products (Mezdari, 1997). The 1-path image is 
used to select local areas of interest. A 1-path data set of 
POLDER level-1 product includes all the directional and 
non-directional parameters for each pixel. 
Figure 2(b) shows a color composite image of POLDER 
210° 
  
(a) 1-Path image (Path #287) 
    
     
  
Azimuth Angle 
(Scene #25) over the Sahara in West Africa in false color 
composite image. A channel 443P normalized radiance 
image as Red, 670P as green, and 865P as blue is 
assigned in the image respectively. These directional 
data are extracted from the 1-path data set. Then the 
observation geometry based on the solar zenith angle 
(0,), the view zenith angle (0) and the relative azimuth 
angle (¢-¢,) is overlapped on the image, where ¢ and ¢, 
are the view and solar azimuth angle respectively. These 
non-directional data are included in the 1-path data set. 
3. DATA ANALYSIS 
Assuming an atmosphere - ground surface model, the 
theoretical reflectance and polarization values are 
computed by the doubling and adding method (Hansen et 
al., 1974). Then we will explain the observed reflectance 
and polarization feature against the viewing angles in a 
target area by using the theoretical values . 
[ ]:Solar Zenith Angle 
180° 
   
300° 330° 
(b) Color composite image of Path #287 - Scene #25, Sahara 
(Red:443p, Green:670p, Blue:865p) 
Figure 2 ADEOS / POLDER's normarized radiance images. 
44 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998 
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