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Monitoring of Riverine Aquatic Vegetation Using Satellite PlanetScope Imagery: Feasibility, Limitations and Prospects
No full textInternational audienceSpectral interference induced by the water and the spatial resolution of many satellite images (≥ 10 m) limit the efficiency of remote sensing for monitoring riverine aquatic plant stands. In this study, the potential of using PlanetScope satellite images (3 m in spatial resolution, ~daily acquisition) for monitoring seasonal and interannual aquatic vegetation surface area was evaluated. Airborne images (≤ 0.2 m) acquired on four dates on three aquatic plant stands were used to create, through visual interpretation, reference maps indicating whether the pixels of each PlanetScope image acquired at ±8 days correspond to aquatic vegetation or nonvegetated aquatic areas. For each PlanetScope image, the green normalized difference vegetation index (GNDVI) was calculated and centred on the mean (GNDVI centred ) to distinguish aquatic vegetation from nonvegetated aquatic areas while minimizing variations in their spectral signature over time. Reference maps from the date when aquatic vegetation was the least developed were used to calculate the GNDVI centred classification threshold. To reduce classification errors from radiometric inconsistencies, the frequency at which pixels of PlanetScope images acquired at ±8 days from airborne images were classified as aquatic vegetation was also calculated. Aquatic vegetation was then empirically defined as pixels with a frequency ≥ 85%. Although the classification of PlanetScope images indicates that low abundances of aquatic vegetation cannot be detected, our results show that large changes in stand surface area can be monitored using a multidate classification threshold, thus providing new opportunities for the monitoring of riverine aquatic vegetation on large scales
Déploiement et Maillage de stations instrumentées en IoT sur le territoire pour diverses études_AG AnaEE 2026 "ECOLOGGING"
No full textInternational audienceIn this poster, we present the deployments of the different types of instrumented stations developed within the framework of the "ECOLOGGING” project, carried out during the year 2024/2025, as well as the main developments, the results obtained, and the conclusions. The “ECOLOGGING” stations are deployed according to the nature of the studies conducted and the associated specific scientific needs.Dans ce poster, nous présentons les déploiements des différents types de stations instrumentées développées dans le cadre du projet "ECOLOGGING", réalisés au cours de l’année 2024/2025, ainsi que les principales évolutions, les résultats obtenus et les conclusions. Les stations ECOLOGGING sont déployées en fonction de la nature des études menées et des besoins scientifiques spécifiques associés
Intégrer des enjeux éthiques, sociétaux et environnementaux dans un cours de conception d'algorithmes
No full textThis document, intended for computer science teachers, describes a case study that puts into practice a questioning of ethical, societal and environmental issues when designing or implementing a decision support system. This study is based on a very popular application, namely road navigation software that informs users of real-time traffic conditions and suggests routes between a starting point and a destination, taking these conditions into account (such as Waze). The approach proposes to intertwine technical considerations (optimal path algorithms, data needed for location, etc.) with a broader view of the ethical, environmental and societal issues raised by the tools studied. Based on the authors' experience conducting sessions with students over several years, this document discusses the context of such a study, suggests teaching resources for implementing it, describes ways to structure discussions, and shares scenarios in different teaching contexts.Ce document, à destination des enseignants d'informatique, décrit une étude de cas qui met en pratique un questionnement sur les enjeux éthiques, sociétaux et environnementaux lors de la conception ou de la mise en œuvre d’un algorithme d'aide à la décision. Cette étude s'appuie sur une application très populaire, à savoir un logiciel d’aide à la navigation routière informant les utilisateurs des conditions de trafic en temps réel, et leur proposant des itinéraires entre une origine et une destination en tenant compte de ces conditions (type Waze). L'approche propose d'entrelacer des considérations techniques (algorithmes de chemins optimaux, données nécessaires pour se localiser, etc.) et une prise de recul sur les enjeux éthiques, environnementaux et sociétaux des outils étudiés. En s'appuyant sur l'expérience conduite par les auteurs depuis plusieurs années en séance face à des étudiants, ce document discute le contexte d'une telle étude, propose des ressources pédagogiques pour mettre en œuvre cette étude, décrit des pistes pour structurer les échanges et partage des scénarisations dans différents contextes pédagogiques
Des objets trop (extra)ordinaires ? Patrimonialiser les traces du socialisme en Roumanie : dilemmes et défis: Les cas de Iași et Timișoara
No full textInternational audiencePlus de trente ans après la chute du régime communiste roumain en 1989, les traces matérielles de la période socialiste sont majoritairement considérées comme trop ordinaires (immeubles d’habitation, usines, magasins, objets du quotidien…) ou à l'inverse trop lourdement chargés d'une mémoire négative pour faire l'objet d'une reconnaissance patrimoniale. Pourtant, on observe récemment une inflexion du regard portée par des architectes spécialistes, des visiteurs étrangers et des acteurs de la société civile : entre curiosité, devoir de mémoire et urgence de préserver certains héritages menacés de disparition, des initiatives de patrimonialisation se développent, jusqu’à interroger les catégories du patrimoine en Roumanie par la reconnaissance progressive des patrimoines et des mémoires ordinaires du second XXème siècle. La communication propose d'analyser ces évolutions tout en mettant en lumière les tensions, conflits de mémoire et divergences de valeurs qui entourent aujourd’hui les traces de la période socialiste en Roumanie
SDManet
No full textThis software is a OMNET++-based simulator for service discovery in heterogeneous networks
Subdiffusive fractional limit of a jump-renewal equation
No full textIn this paper, we consider an age-structured jump model that arises as a description of continuous time random walks with infinite mean waiting time between jumps. We prove that under a suitable rescaling, this equation converges in the long time large scale limit to a time fractional subdiffusion equation
Integrating nano-biosensors into plants: A smart approach for plant disease management to enhance agricultural resilience
No full textInternational audienc
Strong asymptotic freeness of Haar unitaries in quasi-exponential dimensional representations
No full text53 pagesInternational audienceWe prove almost sure strong asymptotic freeness of i.i.d. random unitaries with the following law: sample a Haar unitary matrix of dimension and then send this unitary into an irreducible representation of . The strong convergence holds as long as the irreducible representation arises from a pair of partitions of total size at most and is uniform in this regime. Previously this was known for partitions of total size up to by a result of Bordenave and Collins
A Hilbert--Mumford criterion for generalised Monge--Ampère equations
No full textWe give a new numerical criterion in the spirit of GIT for existence of solutions to inverse Hessian equations, including in particular the J-equation. Our criterion is formulated in terms of stability of pairs in the sense of Paul. To that end, we build on previous work of the author with Dervan, and generalise a result of Zhang, proving isometry between generalised Chow line bundles and mixed Deligne pairings