Papers by Olivier Brunaux
Industrial Crops and Products, Mar 1, 2023
HAL (Le Centre pour la Communication Scientifique Directe), 2022
Systems Dependability Assessment, 2015
HAL (Le Centre pour la Communication Scientifique Directe), 2015
Junctionless Field-Effect Transistors, 2019
The xls file contains one readme and two datasets derived from two forest surveys : "inventa... more The xls file contains one readme and two datasets derived from two forest surveys : "inventaire papetier" inventory done by CTFT between 1974 and 1976 (coded "pap"), and "inventaire habitat" inventory done by ONF between 2006 and 2013 (coded "hab").The datasets include plots coordinates and areas, estimates of mean wood specific gravity (WSG) for each plots, and the number of trees per DBH classes for each plots
Virtual Reality Headsets - A Theoretical and Pragmatic Approach, 2017
Methods in Historical Ecology, 2020
In addition to other remote sensing methods, LiDAR has been used for many years in temperate regi... more In addition to other remote sensing methods, LiDAR has been used for many years in temperate regions or open tropical agricultural landscapes to detect signs of past human activities. The improvement of sensors, and therefore of LiDAR’s ability to penetrate dense vegetation, allows us now to produce digital elevation models (DEMs) that are precise enough to reveal topographic artefacts over large tropical rainforest tracts. We discuss here the requirements for producing such DEMs and detail how they can be used to detect particular landscape-scale pre-Columbian features known as ring-ditched sites in French Guiana.
HAL (Le Centre pour la Communication Scientifique Directe), 2022
Le Centre pour la Communication Scientifique Directe - HAL - memSIC, 2004
The topics addressed throughout this volume deal mainly with the biological and ecological aspect... more The topics addressed throughout this volume deal mainly with the biological and ecological aspects of sustainable forest management, leaving aside the specific sociological and economical context of French Guiana, which cannot be easily extrapolated to other tropical regions. The chapters reflect several shifts in the concerns of the scientific communities working at Paracou since the beginning of the project. The Paracou experiment was aimed primarily at providing concrete answers to the National Forest Office (ONF), which manages most of the 80,600 km 2 of tropical rainforests that cover the department. The accumulation of data on the growth and demography of trees, and their analysis in order to feed models of forest dynamics, has shed considerable light on the potential of the forest as regards the quantity and species of timber that could, or could not, be recovered after logging for the first time. It also allowed to point out the existence of disturbance thresholds that cannot be exceeded without significant modification of the floristic composition and structure of the stands. In this sense, it can be said that the initiators of Paracou have fulfilled their objectives. Over time, however, an awareness of the potential value of the genetic, specific and functional diversity of ecosystems both widened and constrained the objectives of management plans (Leslie, 1997, Mankin, 1998, Mengin-Lecreulx, 2000, Dutrève et al., 2001), and enlarged the set of questions addressed to researchers. This led several teams from INRA, MNHN, ENGREF, IRD, and more recently CNRS and the University of Lyon, in collaboration with CIRAD, to profit from the existence of a large area of more than 50,000 mapped and historically known trees to develop research programs dealing with: • the regeneration potential and the temperament of the main tree species, on the basis of extensive surveys, and in situ and greenhouse experiments;
Malgre son immensite et sa forte diversite, la foret guyanaise abrite une ressource en bois dispe... more Malgre son immensite et sa forte diversite, la foret guyanaise abrite une ressource en bois dispersee et fragile. Assurer une exploitation durable implique donc de trouver un equilibre entre prelevements et potentialites du milieu. Grâce a leurs efforts conjoints, gestionnaires forestiers et chercheurs ont pu etablir les bases d'une sylviculture adaptee a la Guyane, garantissant cet equilibre aussi bien que le maintien des fonctionnalites ecologiques de la foret. (Resume d'auteur)
This .csv file contains all data to repeat the distance sampling study on animal detection presen... more This .csv file contains all data to repeat the distance sampling study on animal detection presented in the associated paper. Perpendicular distance data were not truncated at 50 m
In addition to other remote sensing methods, LiDAR has been used for many years in temperate regi... more In addition to other remote sensing methods, LiDAR has been used for many years in temperate regions or open tropical agricultural landscapes to detect signs of past human activities. The improvement of sensors, and therefore of LiDAR’s ability to penetrate dense vegetation, allows us now to produce digital elevation models (DEMs) that are precise enough to reveal topographic artefacts over large tropical rainforest tracts. We discuss here the requirements for producing such DEMs and detail how they can be used to detect particular landscape-scale pre-Columbian features known as ring-ditched sites in French Guiana.
Monitoring the logging impacts is essential to ensuring the sustainability of forest management u... more Monitoring the logging impacts is essential to ensuring the sustainability of forest management under a certification process. Control tools need to be put in place in order to achieve these objectives. The use of remote sensing to detect canopy gaps in tropical rainforests is an attractive alternative to ground surveys, which are laborious to carry out and lack precision. In French Guiana, detection of logging-related gaps using very high spatial resolution optical satellite images produced by the SPOT 5 sensor is carried out by ONF (French National Forestry Agency). Gaps are detected using an automatic segmentation method. The principle of the automation is to model the forest's signature and calculate a divergence between that theoretical signature and the image histogram in order to detect gaps that constitute a deterioration of forest cover. This tool has been used to assess the quality of logging operations at different scales: forests, blocks, local (onehectare- pixels). ...
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Papers by Olivier Brunaux