CSTB team: Complex Systems and Translational Bioinformatics

Catherine Guth Former Projects

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Projects

Modeling, Simulation and Validation of Complex Dynamic Systems

(Strasbourg 1995-2000)
Work carried out in the LSIIT Remote Sensing team (URA CNRS, 1871) under the direction of Professor M. Raffy. I particularly focused my attention on the modeling, simulation and validation of complex dynamic systems with the study of their integration into decision-making systems. The objective was to model the spatio-temporal evolution of the processes involved in the study of the environment knowing that the current methods of modeling such as the differential equations adapted to the description of the physics are inoperative to describe the problems related to the life sciences. Two fundamental areas of life study were chosen. I co-supervised both works. First, a study on the simulation of watershed erosion by automated networks was carried out during a course of DEA in collaboration with C. Roquin, geomorphologist, in charge of research at the CNRS. The second work was applied to the modeling and simulation of the spatial dynamics of vegetation over large regions. It started with P. Dubé's DEA training course in collaboration with the University of Montreal. It continued with the thesis work of C. Lett in collaboration with J.M. Walter (MC in Plant Ecology). With C. Lett we have developed a per-hole model with a spatialization perspective. Two conceptual approaches to spatialization have been implemented: the first is spatially oriented and carried out using cellular automata, the second is oriented to the individual and carried out using an object design model. Tests of sensitivity of the models to initial conditions, parameter values ​​and boundary conditions were performed. The results of simulations related to the two conceptual approaches were approved by experts in the field. These simulations clearly show the emergence of a forest stand, whereas only local interactions between individuals (trees) are explicitly given. The temporal evolutions of specific land surfaces and the spatial distributions of trees differ, which shows the importance of the initial choice of the spatialization model. This work has given rise to several publications, 2 of which I am the co-author. [1], [2], [12]

Distribution of Image Processing Algorithms for Remote Sensing

(Detached National Expert at the Commission of the European Communities (CEC), Joint Research Center (JRC), Ispra Institute in Italy, Institute for Systems and Informatics Engineering and Institute for Remote Sensing Applications, 1991-94)
The T.Node comes from the Esprit search programs. It is a distributed memory MIMD type computer consisting of a reconfigurable network of transputers, with the Hélios operating system. I have shown that it is possible to implement a set of cooperating tasks for a real application on T.Node by distributing image processing algorithms for remote sensing. I maintained the quality of the sequential version, the graphical interface to visualize the intermediate results and improved the computation time despite the handicaps related to the initializations and the communications of the chosen application. This work and results were reported in a national journal with editorial committee, three international audience conferences with selection committee, an internal report. They were demonstrated at 2 international audience conferences. [4], [6], [7], [8], [13], [14]

Formal specification and development of a database of complex objects. Application to Remote Sensing Objects

(Strasbourg 1984-89)
PhD thesis supervised by Jean-François Dufourd.
This work resulted in a prototype database for managing information on satellite imagery. It was conducted in collaboration with the Scientific Center of IBM-France Paris and the Scientific Space Remote Sensing Group (GSTS) under the direction of Professor François Becker. It was the subject of an ATP CNES-CNRS contract. It gave rise to several international communications and a presentation at NASA's Goddard Flight Center in Washington. [3], [5], [9], [10], [11]

Study of architectures, parallel algorithms for graphic processing and image processing

(Strasbourg 1984)
Workshop of DEA under the direction of Professor Jean-Claude Lafon.

Co-supervision

  • Post-PhD
    • Nicolas Dondainas (97-98) : Coupling of high and low resolution satellite data for the study of desertification in the Mediterranean Basin within the framework of the European project CAMELEO.
  • PhD
    • Christophe Lett (96-99) : Modeling and simulation of the dynamics of forest ecosystems: from aggregated models to individual spatial models.
    • Emmanuel Meyer (98-2000) : Development of spherical discrete geometry and applications. Giving up after 2 years.
  • Training course Master 2 (ex DEA)
    • Matthieu Ferry (95-96) : Simulation of watershed erosion by automaton networks.
    • Parick Dubé (95-96) : First work and prototype on cellular automata and simulation. This work will be taken up by C. Lett.
    • Stéphane Hetzel (97-98) : Study of the parallelisation of cellular automata and application to a simulation algorithm of forest dynamics.
    • Emmanuel Meyer (97-98) : Study of the structure of forest canopies using digitized zenithal hemispherical photographs.
  • Training course Master 2 (ex DESS)
    • In 1993, during my delegation in Ispra, I supervised the 3rd cycle training course and the 3 months of extension of Mr. Mayer Dagobert, student registered at DESS de Télédétection, Paris VI

Publications

  • Papers
    • International journals with reviewing committee
      • [1] C. Lett, C. Silber (Guth), N. Barret,Comparison of a cellular automata network and an individual-based model for the simulation of forest dynamics. Ecollogical Modelling, 1999, 121:277-293
      • [2] C. Lett, C. Silber (Guth), P. Dubé, J.-M. Walter, M. Raffy, Forest dynamics : a spatial gap model simulated on a cellular automata network. Canadian Journal of Remote Sensing, 1999 25(4), 403-411
    • National journals with reviewing committee
      • [3] C. Silber (Guth), Conception et réalisation d'une base de données en télédétection, Revue de la Société Française de Photogrammétrie et de Télédétection, Bulletin n°115, 1989
      • [4] C. Silber, D. Heidrich, P. Bierlaire, Parallélisation du logiciel de pré-traitement d'images satellite NOAA-AVHRR, La lettre du Transputer et des Calculateurs Parallèles, n° 20, December 1993
  • Conferences, congresses and symposia (international conferences with refereed and published acts)
    • International Congresses with Selection Committee**
      • [5] J.-F. Dufourd, C. Silber (Guth), Bases de données et télédétection, IGARSS (International Geoscience And Remote Sensing Symposium) (The Remote Sensing Society, IEEE, U.R.S.I.), Edinburgh, September 1988
      • [6] C. Silber (Guth), D. Heidrich, P. Bierlaire, Processing of AVHRR Imagery using the T.Node Parallel Computer, IGARSS'93 (The Remote Sensing Society, IEEE, U.R.S.I.), Tokyo, August 1993
      • [7] P. Bierlaire, C. Silber (Guth), M. Sharman, Operational Use of Remote Sensing Data for Agricultural Monitoring over Europe, IMAGE'COM 93, Bordeaux, March 1993
      • [8] P. Bierlaire, C. Silber (Guth), M. Sharman, Operational near real-time monitoring of European Agriculture using Satellite and Vectorial Information, EGIS'93 (European Conference and exhibition on Geographical Information Systems), Gênes, March-April 1993
    • National Conferences with Selection Committee
      • [9] C. Silber (Guth), J.-F. Dufourd, Une méthode pour spécifier les objets et les transactions d'une base de données, INFORSID, La Rochelle, June 1988
  • Others
    • Seminars
      • [10] C. Silber (Guth), A Pilot Database System for Handling Satellite and In-Situ Data for Climatic Studies, séminaire interne, NASA, Goddard Space Flight Center, Washington, July 1987
    • Symposium
      • [11] J.-F. Dufourd, C. Silber (Guth) J. Korcak, Bases de données et télédétection, poster présenté au colloque "La recherche et les satellites à haute résolution spatiale : Spot,Landsat,...", Programme National Télédétection Spatiale, SPOT-Image,Orléans, January 1989
      • [12] C. Lett, C. Silber (Guth), P. Dubé, J.-M. Walter, M. Raffy, A spatial model of forets dynamics using a cellular automata network, Actes de l'atelier international Changement d'échelle et modélisation en foresterie : apport de la télédétection et des SIGs, 19-21 mars 1998, Montréal, p. 141-151
    • International publications without selection committee
      • [13] C. Silber (Guth), Recherche d'algorithmes de parallélisation et implémentation 'Space' sur la machine parallèle Supernode (T.Node 64 Transputers), Publication EUR 14807 FR, Office for Official Publications of the European Communities, Luxembourg, 1992
    • Demonstrations of results at international congresses
      • [14] Demonstration of the Space program implemented on a parallel computer, SUPERCOMPUTING, Paris, February 1992
      • [15] Demonstration of the Space program implemented on a parallel computer, TRANSPUTERS'92, Arc et Senans, May 1992
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