Map restoration: latest advances.

in: Proc. 28th Gocad Meeting, Nancy

Abstract

In geology, most of the tectonic deformations might be described by a combination of two main models of deformation: exural slip and shear. These two end-models have been used to develop di erent map restoration methods. In exural slip context, the restoration is often based on a parameterization of the surface. In this paper, two main aspects to improve the applicability of map restoration are presented. Through a sensitivity study on subdivision surfaces, we show that the mesh resolution has to adapted to the complexity of the model to show consistent results. This study also exhibits that the strain is sensitive to the location of the seed of the parameterization, which is the point from which restoration is initiated. Therefore, we propose the user to provide the seed location. If not, we also introduce a new method to make map restoration independent on the seed location: several seed locations are set on the geological horizon to compute restoration realizations, and the resulting restoration vectors are averaged. It also highlights the importance of the pin vector orientation. Another proposal is to restore back not to a at geometry as usually performed, but to a target paleotopography. Paleotopography may indeed be available for instance from facies information, and in uences restoration results. This new method combines two parameterizations, and uses a matching of the target topography and the geological horizon in parametric space.

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    BibTeX Reference

    @INPROCEEDINGS{121_lallier,
        author = { Lallier, Florent and Durand-Riard, Pauline and Titeux, Marc-Olivier and Caumon, Guillaume },
         title = { Map restoration: latest advances. },
     booktitle = { Proc. 28th Gocad Meeting, Nancy },
          year = { 2008 },
      abstract = { In geology, most of the tectonic deformations might be described by a combination of two main
    models of deformation: 
    exural slip and shear. These two end-models have been used to develop
    dierent map restoration methods. In 
    exural slip context, the restoration is often based on a
    parameterization of the surface. In this paper, two main aspects to improve the applicability of
    map restoration are presented.
    Through a sensitivity study on subdivision surfaces, we show that the mesh resolution has to
    adapted to the complexity of the model to show consistent results. This study also exhibits that the
    strain is sensitive to the location of the seed of the parameterization, which is the point from which
    restoration is initiated. Therefore, we propose the user to provide the seed location. If not, we also
    introduce a new method to make map restoration independent on the seed location: several seed
    locations are set on the geological horizon to compute restoration realizations, and the resulting
    restoration vectors are averaged. It also highlights the importance of the pin vector orientation.
    Another proposal is to restore back not to a 
    at geometry as usually performed, but to a target
    paleotopography. Paleotopography may indeed be available for instance from facies information,
    and in
    uences restoration results. This new method combines two parameterizations, and uses a
    matching of the target topography and the geological horizon in parametric space. }
    }