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Télédétection par analyse de retours d’onde LiDAR et spectrométrie à hautes résolutions des espaces sensibles en environnement côtier

Abstract : Coastal dunes are ecosystems of high ecological interest as well as coastal defenses against marine-related hazards, especially in the current climate change and coastal erosion context. The understanding of dune morphology and the dynamics of its components allows to apprehend its functioning and enables to provide a pertinent and durable coastal zone management. The hyperspectral imagery is a technique allowing the passive observation of optical properties of a surface scene constituents. This method is particularly adapted for covering large geographical areas, with an appropriate spatial scale for observing the coastal features. The LiDAR (Light Detection And Ranging) remote sensing is an active method measuring the Earth’s topography. The full-waveform LiDAR, in addition to provide data on the surface elevation, allows to acquire data on the density and light diffusion power of an observed scene features. Therefore, simultaneous acquisition of both data types should improve the monitoring of Earth’s surfaces. In order to compare and process the data from both types of remote sensing method, a pre-processing step of geometric and radiometric corrections should be applied to the hyperspectral images and full-waveform LiDAR data. Following this step, two applications on the hyperspectral/LiDAR data coupling were developed for the estimation on the vegetation distribution over two coastal dunes systems on the island of Noirmoutier, Vendée, France. The first application built up a mapping methodology for the dune vegetation, from a habitat to a specie scale, in order to discuss the species distribution as well as assessing their impact on the dune morphology evolution. The second application, a complete procedure of vegetation habitats was developed, combining the chemical and the light diffusion properties of the dune surfaces.
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Submitted on : Friday, June 2, 2017 - 2:17:03 PM
Last modification on : Tuesday, October 6, 2020 - 11:40:05 AM
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  • HAL Id : tel-01532088, version 1

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Antoine Ba. Télédétection par analyse de retours d’onde LiDAR et spectrométrie à hautes résolutions des espaces sensibles en environnement côtier. Sciences de la Terre. Université de Nantes Faculté des sciences et des techniques, 2017. Français. ⟨tel-01532088⟩

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