FIRST
INTERNATIONAL SYMPOSIUM ON ROBUST STATISTICS AND FUZZY TECHNIQUES IN
GEODESY AND GIS, ZURICH, SWITZERLAND, MARCH 12-16, 2001
The
'First International Symposium on Robust Statistics and Fuzzy
Techniques in Geodesy and GIS' took place at the Swiss Federal
Institute of Technology (ETH) in Zurich, Switzerland, from March
12-16, 2001. It was initiated by the members of the Special Study
Group (SSG) 4.190 of the International Association of Geodesy (IAG) on
'Non-probabilistic assessment in geodetic data analysis'. It was
organized by Prof. A. Carosio, ETH Zurich,, and Dr. H. Kutterer, DGFI
Munich, chairman of the SSG. Nearly 60 participants from 15 countries
attended the symposium.
The
program of the meeting consisted of applications of robust statistics
and fuzzy theory, mainly in the fields of geodetic engineering,
deformation analysis, geographic information systems, satellite-based
positioning (GPS),
and
photogrammetry. Therefore five technical sessions and a panel
discussion were organized. In advance, two tutorials were given on
robust statistics (A. Carosio) and on fuzzy logic (H. Kutterer, S. Schön)
on monday, March 12.
The
symposium was opened on tuesday, March 13, with a welcome address by
Prof. B. Heck, University of Karlsruhe, president of the IAG section
IV. Two invited lectures followed. The first one was presented by
Prof. F. Hampel, ETH Zurich, who considered both the historical
development of robust statistics and recent mathematical problems. The
second one was given by Prof. R. Viertl, Technical University of
Vienna, who motivated the non-precision approach and showed the
application of statistical methods to non-precise data based on the
extension principle of fuzzy theory. H. Kutterer gave the last lecture
in this session on a general viewpoint of uncertainty assessment.
In
the technical session on geodetic engineering four talks were focussed
on robust statistics: kinematic positioning (Y. Yang), the BIBER
estimator (F. Wicki), and the reliability of robust estimators (M.
Berber, S. Hekimoglu). One talk considered the use of interval
mathematics for the measurement uncertainties (S. Schön). L. Soukup
discussed 'least squares without minimization'.
The
second technical session on deformation analysis showed a variety of
different assessment methods: a conic fitting algorithm (O. Akyilmaz),
inference on deformation measures like strain tensors (J. Cai), fuzzy
deformation analysis (K. Heine), Plucker coordinates (R. Jurisch),
artificial neural networks (J. B. Miima), modelling alternatives in
deformation measurements (D. Rossikopoulos), and maximum correlation
adjustment (F.
Neitzel).
The
third session which was on Geographic Information Systems (GIS)
consisted of four talks, three using fuzzy logic (G. Joos, S. Keller,
E. Stefanakis) and one on robust estimation techniques (E. Kanani).
The following session was dedicated to GPS data processing and
analysis: real-time prediction of failures (C. Dacheng), robust
techniques (A. Wieser, Y. Yang), and fuzzy methods (S. Leinen, H.
Kutterer).
The
last technical session of the symposium was on photogrammetry, remote
sensing, and image processing. F. Sanso discussed the Wiener-Kolmogorov
prediction problem with the application to digital terrain models. L.
Mussio considered semantic ambiguity questions for pattern
recognition. M. Scaioni showed the use of the LMS estimator for
outlier rejection in automatic aerial triangulation.
The
last day of the symposium started with an introductory talk by F.
Sanso on the challenges for the IAG in data analysis in the fields of
geodesy and GIS, especially regarding the modelling of uncertainty by
probabilistic and
non-probabilistic
techniques. A panel discussion on data analysis within IAG closed the
symposium.
The
proceedings of the symposium are published as Report No. 295 of the
Institute of Geodesy and Photogrammetry of the Swiss Federal Institute
of Technology Zurich (ETH). Further information can be found on the
website of the IAG SSG 4.190. The address is www.dgfi.badw.de/ssg4.190.
Last but not least a warm thanks goes to the local committee around A.
Carosio at the ETH Zurich for the excellent organization of the
symposium.
H.
Kutterer
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