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-
AT.
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