Pixel Size Scan Size Photo Scale 
1:5 000 1:10 000 1:25 000 1:50 000 
12.5 micron 320 / 960 Mb 0.09 0.18 0.46 0.92 
25 micron 80 / 240 Mb 0.11 0.22 0.51 1.09 
50 micron 20 / 60 Mb 0.13 0.26 0.61 1.28 
100 micron 4/12Mb 0.15 0.30 087 2.50 
Spot height accuracy specification of 0.15 0.30 0.76 1.52 
QDPI 
  
  
Table 3: VituoZo Digital Elevation Model accuracy for different photoscales and pixel sizes 
5. CONCLUSIONS 
The findings of the previous tests can be combined to find 
allowable combinations of flying height, pixel size and 
compression ratios which meet the map specifications. The 
results will be used by the authors for further theoretical studies 
to explain the observed relationships and to derive compression 
methods which are more suited than those used in this study. 
6. REFERENCES 
Cock D. and Brooke G., 1995  Gayndah Benchmark - Final 
Report. VirtuoZo Systems, Brisbane 1995. 
Kubik K., 1993 3-D Object Reconstruction. | AUSIA '93 
International Colloquium, Wuhan, China, 19-22 October 1993. 
Wallace, G., 1991 The JPEG Still Picture Compression 
Standard. Communications of the ACM, Vol 34. No 4, p 31-44 
Z. Zhang, X. Wu, K. Kubik, 1995 Developments of Automated 
Mapping in PR China. AEROSENSE 95 - SPIE 
Aerospace/Defence Sensing and Dual-Use Photonics, Orlando, 
April 1995 
206 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B2. Vienna 1996 
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