A5081343469- Data Management and Algorithms
- Geographic Information Systems Studies
- Geological and Geochemical Analysis
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Geological Studies and Exploration
- Geological formations and processes
- Geomagnetism and Paleomagnetism Studies
- earthquake and tectonic studies
- 3D Modeling in Geospatial Applications
- High-pressure geophysics and materials
- Advanced Computational Techniques and Applications
- Constraint Satisfaction and Optimization
- Geological Modeling and Analysis
- Cellular Automata and Applications
- Soil Geostatistics and Mapping
- Urban Design and Spatial Analysis
- Distributed and Parallel Computing Systems
- Geological and Geophysical Studies Worldwide
- Marine Biology and Ecology Research
- Land Use and Ecosystem Services
- Wildlife-Road Interactions and Conservation
- Hydrology and Watershed Management Studies
- Soil erosion and sediment transport
Institut de Recherche de l’École Navale
2004-2019
École nationale supérieure de techniques avancées Bretagne
2019
École Navale
2004-2018
ParisTech
2016
Hydrothermal circulation at ultramafic‐hosted sites supports a large variety of high‐ and low‐temperature hydrothermal vents associated ecosystems. The discovery abundant fossil vesicomyid thyasirid shell accumulations the ridge crest, approximately 2.5 km east active Rainbow vent field on Mid‐Atlantic Ridge (MAR, 36°13′N), increased our knowledge regarding diversity communities slow spreading ridges. Bivalve molluscs family Vesicomyidae were represented by genus Phreagena . Here we present...
Multibeam bathymetry data obtained along a 2400 km long section of the Mid‐Atlantic Ridge (MAR) from 15°N to Azores platform (40°N) and satellite‐derived gravity were used calculate mantle Bouguer anomaly (MBA) this portion MAR. Both sets determine relations between anomalies topographic variations discuss these in terms thermal difference. A long‐wavelength influence hot spot is characterized by gentle, continuous slope average ridge axial depth general gradient along‐axis MBA profile. This...
Abstract Defining a model for the representation and analysis of spatio‐temporal dynamics remains an open domain in geographical information sciences. In this article we investigate graph‐based dedicated to managing extracting sets entities related space time. The approach is based on spatial temporal local relations between neighboring during consecutive times. allows us extract connected distant time over long periods large spaces. From GIS concepts qualitative reasoning time, combine...
After reduction to correct for the topography, spreading rate, latitude, and lineation azimuth effects, axial magnetic anomalies amplitudes are compared with bathymetric, gravity, seismological, geochemical data along a 2600‐km‐long section of Mid‐Atlantic Ridge axis between 20°N 40°N. Significant results obtained at two different scales, regional one (>100 km) related sublithospheric thermal perturbations such as those associated hotspots local (<100 ridge segmentation. At scale,...
Abstract Spreading processes at the axes of fast spreading ridges are mainly controlled by magmatic activity, whereas tectonic activity dominates further away from axis. High‐resolution near‐bottom bathymetry data, photographs, videos, and human observations submersible surveys used to develop a detailed analysis 16°N segment East Pacific Rise (EPR). These data evaluate how highly segment, close hot spot, affects nucleation evolution faulting patterns impacts evaluation strain within 2 km...
A better understanding of the relationship between structure and functions urban suburban spaces is one avenues research still open for geographical information science. The presented in this paper develops several graph-based metrics whose objective to characterize some local global structural properties that reflect way overall building layout can be cross-related road layout. Such are modeled as an aggregation parcels, buildings, networks. We introduce computational measures (Ratio...
The search for the most appropriate GIS data model to integrate, manipulate and analyse spatio-temporal raises several research questions about conceptualisation of geographic spaces. Although there is now a general consensus that many environmental phenomena require field object conceptualisations provide comprehensive representation, still need better integration these dual representations space within formal database. presented in this paper introduces hybrid representation data. whole...
Triangular Irregular Network (TIN) and Regular Square Grid (RSG) are widely used for representing 2.5 dimensional spatial data. However, these models not defined from the topographic properties of terrain (i.e., ridge lines, valley saddle points, etc.). This paper introduces a three-step feature-based approach extraction on scattered elevation data modeled by TIN. Firstly, segmentation process extracts homogeneous morphological areas bounded critical lines points. Secondly, points displaced...
This paper introduces a graph-based and structural model for the representation of land spaces. We develop spatial that integrates three complementary abstractions (i.e., parcels, buildings, roads) provide representation. The modeling approach retains different categories topological relations between buildings roads, thus generating graphs whose properties are evaluated computed using operators. union these generates connected graph where closely associated to parcels road network, then...
Pocket Panorama, an original client-server application, provides mapping data and 3D terrain visualizations to a handheld pocket PC. The PC acts as client server PC, which contains all performs display manipulations. visualization displayed on the uses GPS positions transmitted by All exchanges use HTTP protocol remain independent of network connection used. Within United States, networked can automatically obtain high resolution maps or aerial photography around its position with single...
The aim of this work is the characterization seafloor using bathymetric images segmentation. bathy-metric image considered as set oriented wave profiles generated, in general, by unidirectional currents (water flows constantly one direction) where each profile can be viewed superposition fast oscillations (ripples) and slow (sand waves). Due to texture multicomponent aspects image, performed an adaptive mutliresolution decomposition based on multivariate empirical mode (MEMD) technique. MEMD...
The experimental research developed in this paper introduces a hybrid temporal GIS representation for studying the dynamics of coastal seabed. approach is based on dual data model that combines object and field views space. first concept one an object-field defined as which each location associated to or more geographic objects type. second key field-object with internal heterogeneity conceptualized field. main idea behind provide flexible supports evolutions. A series spatio-temporal...
This paper describes a Java application, Target 3D, that creates an interactive VRML model to visualize real terrain configurations. The application requires input elevation grid and texture drape on the framework, which can be provided by freeware MICRODEM program from wide variety of grid, raster, vector map data. most important feature this is users interactively add target models scene, allows recreating reality in detail. To deliver landscape visualization, uses client–side architecture...