Full text: XVIIIth Congress (Part B3)

     
  
  
  
  
   
  
  
   
  
  
  
  
  
  
  
  
   
    
  
  
  
  
  
   
  
  
  
  
  
   
   
   
   
  
  
  
  
  
  
  
  
  
  
  
  
   
  
  
  
   
  
  
  
  
  
  
  
  
  
  
  
     
  
    
     
   
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
pixel size 30 um 15 um pixel size 30 um 15 um 
# matched points / 15.0 10.9 # matched points / 15.0 10.9 
photo photo 
# image points / photo 590 490 # image points / photo 490 120 
# block points 5022 5557 # block points 4168 1034 
# points / Gruber area 18.7 5.2 # points / Gruber area 21.7 5.4 
Co [HM] 9.4 7.5 Co [pm] 8.8 6.5 
Oo [pixel] 0.31 0.5 de [pixel] 0.31 0.43 
c, [cm] 14.5 12.3 o, [cm] 2.9 2.1 
Empirical results: Empirical results: 
# check points 16 16 # check points 68 68 
ux [em] ([o.]) 5.4 (0.4) 4.0 (0.3) ux [em] ([o.]) 0.9 (0.3) 0.9 (0.4) 
uy [em] ([o.]) 7.4 (0.5) 7.2 (0.6) uy [cm] ([o.]) 0.8 (0.3) 1.0 (0.5) 
uz [cm] ([o.]) 11.8 (0.8) || 16.0 (1.3) pz [cm] ([o.]) 5.1 (1.7) 2.9 (1.4) 
Theoretical accuracy: Theoretical accuracy: 
Check points: Check points: 
ox [em] ([o.]) 8.8 (0.6) 7.6 (0.6) ox [em] ([o.]) 2.9(1.0) || 2.4 (1.15) 
oy [em] ([o.]) 10.5 (0.7) 8.8 (0.7) oy [em] ([o.]) 2.7 (0.9) 2.3 (1.1) 
cz [em] ([o.]) 23.5 (1.6) | 20.1 (1.6) oz [em] ([o.]) 6.8 (2.3) 5.0 (2.4) 
Orientation parameters: Orientation parameters: 
co [mgrd] 3.2 2.9 Co[Mgrd] 6.5 5.3 
os[mgrd] 3.2 3.0 os[mgrd] 7.6 5.1 
ox[mgrd] 1.3 1.2 ox[mgrd] 2.4 2.6 
o [em] ([o.]) 11.5(0.8) | 10.7 (0.6) o [em] ([o.]) 4.4 (1.5) 3.2 (1.5) 
oy[em] ([o.]) 12.7 (0.7) || 11.4 (0.7) oy[em] ([o.]) 3.4 (1.2) 3.3 (1.6) 
cz[em] ([o.]) 6.3 (1.6) 5.9 (1.6) cz[em] ([o.]) 3.2 (1.1) 1.9 (0.9) 
net comp. time / image 5.7 min net comp. time / image 3.9 min 
  
  
  
  
  
     
   
      
     
    
   
   
    
Table 2: Block "Vaihingen/Enz" (photo scale : 1:16000) 
  
  
  
  
  
Figure 12: Index map of block "Vaihingen/Enz" 
at approximately 9 - 10 minutes per image. It is to be 
kept in mind that the net computation time refers to a 
rather old processor which has been practically 
replaced by the R4400 with 250 MHz. That processor 
gives at least 2 times better performance, Also, the net 
computation time for the block "Vaihingen/Enz" is high 
because of the 5 side strips and the related large number 
of tie point areas. Note that the net computation time for 
the block "Texas DOT" is in the order of 4 minutes per 
image. Thus, we can expect an overall time performance 
412 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996 
  
Table 3: Block "Texas DOT* (photo scale : 1:3300) 
  
  
x 5 2 Em Yemen X 
  
  
  
Figure 13: Index map of block “Texas DOT“ 
of say 5 - 6 minutes per image presuming the power of 
today’s workstations and a fully automatic procedure in 
the batch processes of the system. Since computer 
performance is steadily improved in remarkably short 
time cycles, such numbers can be reduced quite easily. 
In general, the estimate of the overall time performance 
per image represents an order of magnitude, but it is 
very promising for the economical benefit of automatic 
digital aerial triangulation being implemented in MATCH- 
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