DSS 
the 
GPS 
the 
ping 
rtant 
  
  
OUTIL DILLLILLILLLDLDPLLPLLLLLLLLLTITTLTÓITITOITTILLLLILTIITASA4I) ILI. 
8 
Figure 3 shows the same image after passing all 
procedures of flight attitude failure corrections ( 
pitch, yaw, roll). In this image, the average 
compression rate was controlled to be constantly 
about 18 whereas the Q-factor of JPEG based 
compression method varied between 50 and 200. 
Figure 4 Image of an open- cut mining 
Figure 4 is an image of an open coal pit taken by 
WAAC in October 1995. Again, the ground pixel 
size from a flight altitude of 3000m is about Imxl1m. 
  
173 
With WAOSS's interface maximum data rate of 
500kBit/s the compression is necessary. To avoid 
the compression noise in the reconstructed images, 
higher interface data rates have to be implemented 
which leads us to the advantage of WAAC for 
airborne experiments. 
The image size is about 5kmx8,5km. For this image 
no compression was applied. The camera was 
working in the 8bit normalised mode[2]. The dark 
coal band and the bright clouds cause a radiometric 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B1. Vienna 1996