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Gregoire Mariethoz research group

Remote Sensing, Geostatistics, Hydrology


University of Lausanne (UNIL)

UNSW Australia


Current group members:

Gregoire Mariethoz (Prof. Assistant, UNIL)

Lionel Benoit (PhD Candidate, UNIL)

Mathieu Gravey (PhD Candidate, UNIL)

Luiz Gustavo Rasera (PhD Candidate, UNIL)

Inigo Irarrazaval  (PhD Candidate, UNIL)

Elisa Giaccone (PhD Candidate, UNIL, main supervisor: Christophe Lambiel)

James Thornton (PhD Candidate, University of Neuchatel, main supervisor: Philip Brunner)

Moctar Dembele (PhD Candidate, UNIL, main supervisor: Bettina Schaefli)

Qiyu Chen (PhD Candidate, UNIL / China University of Geosciences)

Juan Carlos Castilla (PhD Candidate, UNSW)




The main research interests of the research group reside in the development of stochastic methods that characterize the spatial and temporal variability inherent to hydrological systems. We develop numerical techniques using high-order, nonparametric statistics. These allow us to analyze complex datasets such as remote sensing data or the outputs of complex models (climate models or flow/transport models). The work pursued is at the frontier between Earth modeling and computer science, with a strong emphasis on stochastic models, training images and example-based modeling.


One contribution has been the development of numerical methods that offer improved possibilities to integrate different kinds of data, especially those using the semi-qualitative concept of a training image. These include algorithms to perform reconstructions and stochastic simulations, broadly known as MPS. Please check out the book on this topic.


The main keywords of our research themes are:

Remote Sensing (Image processing, gap-filling, data fusion, statistical downscaling, pattern analysis, rainfall measurement and uncertainty quantification, climate change indicators)

Geostatistics (Multiple-point geostatistics as well as variogram-based geostatistics, training images, model inference, spatial variability, texture synthesis, parallel computing)

Hydrology (Spatio-temporal rainfall analysis, rainfall-runoff modeling, rainfall measurement, time series analysis, water resources management using Agent-Based Models)

Hydrogeology (Aquifer heterogeneity, flow and transport modeling, inverse problems, pore-scale models, karst infiltration processes, groundwater usage optimization).


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If you are interested in doing research in an area related to the topics described above, do not hesitate to take contact. We regularly welcome external researchers who come to Lausanne to join our group for periods ranging from months to years. Switzerland offers a range of scholarship opportunities to support top-ranking students.

If you have or want to apply for funding to do a PhD at the University of Lausanne, please check out enrollment requirements here: https://www.unil.ch/immat/en/home/menuinst/futurs-doctorants.html.