Olivier Bonin, researcher IFSTTAR at LVMT (Laboratoire Ville-Mobilité-Transport, Champs-sur-Marne), is defending his Accreditation to supervise research at the laboratory ThéMA.

 

The defense will take place on may the 27th at 2 pm, at the " Grand Salon" (18, rue Chifflet, UFR SLHS).

 

Olivier Bonin

 

Geography has since antiquity used cartography to describe the shape of the Earth and its population. Indeed, cartography is an analogical model of the world particularly suited to the description of shapes, spatial arrangements and spatial relationships, i.e. information of a qualitative nature, the meaning of which emerges when reading maps. The theoretical and quantitative turn in geography has seen the development of many formal and numerical modelling approaches in which, paradoxically, it is more difficult to integrate the question of the meaning of space in human activities. In this work, I propose a formal modelling framework aimed at clarifying the meaning of space. Through a phenomenological approach, I identify the different forms of perception of individuals and human communities, in order to propose general principles that are then mathematized by techniques from the sciences of complexity. Three models related to urban morphogenesis illustrate different facets of this general modelling framework aimed at giving meaning to space.

 

 

Defense jury

Alessandro Sarti, Director of Research at EHESS and joint to Collège de France

Gabriel Dupuy, Emeritus Professor at the University Paris I -

Jean-Philippe Antoni, Professor at the University of Bourgogne-Franche-Comté – TheMA

Geoffrey Caruso, Professor at the University of Luxembourg

Cyrille Bertelle, Professor at the University Le Havre – LITIS

Pierre Frankhauser, Emeritus Professor at the University of Franche Comté - ThéMA

 

Personal homepage : http://www.lvmt.fr/equipe/olivier-bonin/

 

 

Last Updated: Thursday, 09 May 2019 09:10

An article published in Nature Scientific Reports: Huge decrease of frost frequency in the Mont-Blanc Massif under climate change

 

Benjamin Pohl, Daniel Joly, Julien Pergaud, Jean-François Buonchristiani, Paul Soare & Alexandre Berger, Nature Scientific reports volume 9, Article number : 4919 (2019)

https://www.nature.com/articles/s41598-019-41398-5#Abs1           

                

This study co-signed by 5 members of the laboratory Biogéosciences (Dijon) was led in the framework of the ANR project « VIP-Mont-Blanc » about the consequences of climate change in the Mont Blanc massif. It is based on 13 models of simulated temperatures used to define the IPCC’s climate scenarios. These data have a coarse spatial resolution, i.e. grid cells of a 100 to 200 km, but have a very high temporal resolution: a daily value of minimum and maximum temperature from 1850 to 2100, amounting to 55 000 days! The algorithm developed by the Bourgogne Franche-Comté team aims at reducing this data’s spatial inaccuracy by “downscaling”. Eventually, the coupling of physical and geographical models provided very high spatio-temporal resolution climate data. At a 200 m resolution over the entire Mont Blanc massif and for 55 000 days, each of the 13 simulations were downscaled according to two scenarios, optimistic vs pessimistic.

Until the middle of the 20th century, the study shows few differences between scenarios but in the second half, strong evolutions arise. Under the pessimistic scenario, every third day will be frostless on the Mont Blanc summit in summer, with a risk of rock wall destabilization and collapse all over the range. Things will be not better in winter with very little snow in the valley.

 

Mont Blanc JC

                   Mont Blanc massif from the Brévent ; Credit photo : Jean-Christophe Foltête

Last Updated: Monday, 08 April 2019 13:17

PixScape software, devoted to the modelling of landscape visibility, is published in the journal “Transactions in GIS”

PixScape software proposes to integrate a large set of functions for modeling landscape visibility while remaining interfaced with GIS software. This software can be used to perform a complete landscape assessment by computing a wide range of original landscape metrics. It performs tangential analysis in addition to viewshed analysis, which can produce more realistic outcomes. Because landscape visibility analysis over large areas implies significant computation time, the software also integrates a multi‐resolution process intended to speed up calculations while also taking into account the cognitive abilities of human vision.

 

Yohan Sahraoui, Gilles Vuidel, Daniel Joly, Jean-Christophe Foltête. Integrated GIS software for computing landscape visibility metrics. Transactions in GIS, Wiley, 2018

DOI : 10.1111/tgis.12457

Pixscape website

pixscape

 

Last Updated: Friday, 31 August 2018 13:01
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