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 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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