1.5
| —e— fixed parameter filter | A
= tT | t adaptive filter M Hie
xr ——-
T Sl eT
Pa
wu o5 |}
0
0.25 0.5 0.75 1 1.25 1.5
Filtering parameter y
Fig.13 Error characteristics of the adaptive filter
and the fixed parameter filter(S/N=40dB).
30 L i
{ '
25 | — dà without filter .
| » =X= wfixed parameter filter à
20 | | —o— adaptive filter | 0
Error(%)
70 60 50 40 30 20
S/N(dB)
Fig.14 Error characteristics against S/N.
50 — ew
|
|
|
|
|
il 9
1 Piel 256
CC —
Fig.15 The results of 3-D analysis.
f e Steep model
Normal model
ice Rlat model
Error(%)
Q = ND Wa Mo Jobo
Fig.16 The error against
the imaging angle parameter, B/H.
remeron
| —Steep model |
| e=Normal model
[| Flat Model -
1 Pixel ^us 280
Fig.17 The central cross section
of terrain models.
4.CONCLUSION
The correlation coefficient analysis method is
susceptible to noise in the flat land, conversely it
is insensible with noise in the steep region like a
top of mountain. Accordingly, we can obtain more
accurate height data using adaptive filter which
automatically select some different characteristic
filters fitting to geographical features. Although
the proposed method is the simple algorithm, it is
effective to get accurate data.
In the correlation analysis method, it is very
important to decide to the imaging angle of
satellite system. We can consider that more
accuracy terrain data is restored under the most
suitable imaging angle and the best size of the
correlation window.
Consequently, by using the proposed method, we
can improve the performance of the system
without expanding the optical aperture.
REFERENCE
[1]M. Lehner, 1995. The photogrammetric Eval-
uation of MOMS-02 mode 3 data (Mexico,
Ethiopia). Proceeding of SPIE Conference on
Remote Sensing and Reconstruction for 3-D
Objects and Scene, pp.102-114.
[2]R. Nagura, 1992. High resolution stereo
imaging and data compression.Proceedings of
the Central Symposium of the 'International
Space Year' Conference, pp.907-912.
[3]R. Nagura, 1991. Conceptual study on
forthcoming very high resolution visible and
near infrared radiometers. Asian Conference on
Remote Sensing, pp.E-3-1_E-3-6.
314 International Archives of Photogrammetry and Remote Sensing. Vol. XXXII, Part 7, Budapest, 1998
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