Team geostat

Overall Objectives
Scientific Foundations
Application Domains
New Results
Contracts and Grants with Industry

Section: Scientific Foundations

International context

GEOSTAT is easily situated in the landscape of other methodologies developped for more than 20 years, for example what we call the canonical formalism in this document, and which is also known under the name multifractal formalism . These approaches are fundamentally based on statistical assumptions whose origins can be traced back since the seminal works by Kolmogorov in 1941  [39] . Some of the fundamental steps in the development of purely statistical approaches to turbulence are:

The study of signals in which a hierarchy of geometric structures is evidenced goes far beyond the single domain of fully developped turbulence; it is fundamentally related to signals and systems (universality classes in critical systems) in which the values of singularity exponents give access to global properties of the signal: there is a comon attractor leading the dynamics; note that one important point is the correct evaluation of these exponents. This defines a wide area of research in itself, and justifies the approach undertaken in GEOSTAT; henceforth, geometric structures related to singularity exponents have been studied in geophysical signals of different types  [58] , [29] , in the study of clouds  [21] , [56] , pluviometry  [61] , and in Oceanography  [70] , to take only few examples. More generally, the geometrical super-structures computed in the framework of the MMF, and their physical signifiance in the analysis of dynamics, clears the path for new research in many domains were complex signals are available: natural images  [48] , [72] , time series (including biological data)  [37] , [44] , trafic in networks  [55] , econometric data  [47] , [62] , [75] , [77][5] .


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