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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B1. Istanbul 2004
Figure 9. Resolution pattern — bar target and Siemens star.
Interpolated (left image) and restored image (right image)
To quantify the resolution and the results of restoration we
investigate modulation of different resolution patterns (see
figure 10). A convenient approach is the analysis of radial
modulation of the Siemens star.
Figure 10. Analysis of modulation from Siemens star (left)
with radial modulation analysis for one circle (right)
The diameter of the star in pixel is proportional to
circumference of a circle and can be analysed in relation to
image pixel. Different diameter realize variable spatial
frequencies. The evaluation of the modulation for different
radii gives a quantitative prediction for the resolution.
1.D 1 SIEGE II
x
OR * restored dota zs
Et +. (somp=5em)
3
| m A
c0 —
C p
> N -
n \ 4
wo E À
à
c 04F- = =
dw :
original data original data
l- (samp=2.5em} « sam 4
Ql erac ais on Ca Le Ee cbt A EE
0.0 0.2 0.4 0.6 0.8 1.0
Frequency [lp/ pixel]
Figure 11. Evaluation of the modulation from Siemens star
In figure 11 the measured data from modulation analysis are
shown. The measured data are in a good accordance to a fit on
a Gaussian. The original data are sampled on 5 cm and 2.5 cm.
The analyses of the Gaussian parameter o (which is 0.5 pixel
for the 5 cm data) shows the expected factor of two between
both measures. The influence of restoration before rectification
provide an improvement in cand therefore in resolution,
which is also a factor of two. Using resolution definition like in
chapter 2.4 the MRD is in the range of 7.5 cm for the original
data and better than one pixel for the restored data.
CONCLUSION
The given results from the Rheintal test mission show the large
potential of ADS40. The results will be reconfirmed by another
test flight, that will be flown in the Vaihingen/Enz test site,
maintained from Institute for Photogrammetry (ifp). Besides
the verification of resolution potential a second focus 1s laid on
the analysis of the maximum geometric accuracy, which will be
evaluated from independent check points in object space. In
this context especially the influence of different IMU quality
for subsequent data processing is investigated.
ACKNOWLEDGEMENTS
The authors would like to thank Werner Schneider, Susanne
Becker and Mathias Schneider for preparation and evaluation
of the data.
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