TETROFOR - Remote sensing of tropical vegetations

Keywords
LiDAR
THR images
Time series
Drone
Tropical rainforests
Mangroves
Savanas

To characterise the role of natural tropical vegetation as a reservoir of biodiversity and an essential component in the regulation of biogeochemical (water, carbon) and energy cycles on a global scale.

This theme brings together research actions that implement remote sensing tools and ad hoc methodological developments.
Remote sensing approaches are generally based on the use of passive or active signals of high resolution (temporal, spatial or spectral). LiDAR (terrestrial or airborne) plays a predominant role among these tools, thanks to the unique link it establishes between tree architecture and stand organisation, as well as its potential for quantifying carbon acquisition and allocation. Our approaches are also based on (i) mapping of tropical forests at different scales (local, regional) using multi-sensor, multi-temporal and multi-spatial resolution approaches, (ii) canopy modelling (based on archi-FSPM models or 3D digitisation) and (iii) modelling of radiative transfer, both from a functional (photosynthesis, allocation, etc.) and instrumental (sensor sensitivity, cal/val) perspective.

We are involved in research projects, impact studies, development studies, or sensitivity studies, through services for public or private partners. This involves producing vegetation maps or providing field data or compatible population models for radiative transfer modelling. Our main projects are in Central Africa (LMI Dycofac) and in French Guiana (Labex CEBA) but also in New Caledonia, India and Thailand. Access to ground truth data relies on plot networks developed in partnership with local institutions. We regularly mobilise close remote sensing equipment (6 drones, 5 qualified pilots, 3 TLS scanners, 1 UAV-LS scanner, DGNSS systems), a spectroradiometer, canopy climbing equipment and trained climbers. We also have an archive of airborne and/or satellite images in our regions of intervention allowing us to develop analyses of cover dynamics.

Acronym Title Duration
ADMIREPartenariat pour l’Analyse des DynaMIques de REforestation et de la résilience forestière (ADMIRE)
Project PI: Philippe BIRNBAUM 
2021 - 2024
AFRIFIREDéterminants et impacts du régime des feux en Afrique tropicale
Project PI: Charly FAVIER (ISEM)  / Maxime REJOU-MECHAIN 
2021 - 2022
BIOMASSBIOMASS
Project PI: Ludovic VILLARD (CESBIO)  
2021 - 2022
DESSFORDegraded Stable States in Tropical Forests
Project PI: Maxime REJOU-MECHAIN 
2021 - 2024
ForestScanNew technology for characterising forest structure and biomass at ‘Super Sites’ for EO cal/val across the tropics
Project PI: Mat DISNEY (UCL)  
2021 - 2023
PhenobsTowards a phenology observatory in French Guiana to study climate-vegetation feedbacks and the diversity of plant strategies
Project PI: Nicolas BARBIER 
2020 - 2022
PROFEAACPROmouvoir et Formaliser l’Exploitation Artisanale du bois d’œuvre en Afrique Centrale par une approche multi-scalaire : gestion territorialisée de la ressource, gouvernance de la filière, promotion des demandes de sciages légaux
Project PI: Guillaume LESCUYER (CIFOR - Cirad)  
2019 - 2023
ReliquesFragmentation des forets sur substrats ultramafiques en Nouvelle Calédonie
Project PI: Philippe BIRNBAUM / Nicolas BARBIER 
2019 - 2022
Sé2CoulSéries Sentinel pour les couverts ligneux
Project PI: Pierre COUTERON / Raffaele GAETANO (CIRAD)  
2020 - 2023
Tall TreesA 3D perspective on the effects of topography and wind on forest height and dynamics
Project PI: David COOMES (Cambridge University)  
2019 - 2023

BADOURDINE Colette 2019 - 2022. Mapping tropical forest diversity from multi- and hyper-spectral imagery. Ecole doctorale : GAIA / Université de Montpellier. Dir : PELISSIER Raphaël / Co-dir. : VINCENT Grégoire

BALL James 2019 - 2023. Utilisation de la télédétection pour comprendre la phénologie foliaire et la productivité des forêts tropicales. Ecole doctorale : University of Cambridge / University of Cambridge. Dir : COOMES David / Co-dir. : VINCENT Grégoire

HUERTAS GARCIA Claudia 2018 - 2021. Le sujet de doctorat est le suivant : .. Ecole doctorale : GAIA / Université de Montpellier. Dir : VINCENT Grégoire / Co-dir. : PELISSIER Raphaël

MOFACK Gislain 2018 - 2021. Ses recherches portent sur la prise en compte des interactions et de la plasticité phénotypique des arbres dans l'estimation de la biomasse et du stock de carbone, à l'aide de l'outil LiDAR terrestre.. Ecole doctorale : Sciences de la Vie, Santé et Environnement / Université de Yaoundé I, Cameroun. Dir : COUTERON Pierre / Co-dir. : SONKE Bonaventure

SAGANG TAKOUGOUM Le-Bienfaiteur 2018 - 2021. Etude de la dynamique du contact forêt- savane dans un écosystème de savane tropicale boisée de la région du Centre Cameroun. Université de Yaoundé I, Cameroun. Dir : BARBIER Nicolas / Co-dir. : SONKE Bonaventure

  • JB Feret (Tetis MPL),
  • D Coomes (Cambridge U),
  • S Saatchi (NASA JPL),
  • R Valbuena (Wales University),
  • J Chanussot (GIPSA Grenoble),
  • M Disney (UCL),
  • V Deblauwe (CBI),
  • B Sonké (LaboSYstE, ENS-Univ Yaoundé I),
  • JP Gastellu Etchegorry, T Le Toan (Cesbio),
  • H Poilvé (Airbus DS),
  • M Herold (WUR),
  • T Stévart (MBG),
  • S Gourlet Fleury, E Forni (CIRAD Forêts et Sociétés).