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Mapping burn severity in the western Italian Alps through phenologically coherent reflectance composites derived from Sentinel-2 imagery / Donato Morresi in Remote sensing of environment, vol 269 (February 2022)  

Public [article]  inRemote sensing of environment > vol 269 (February 2022) . - n° 112800 Titre : Mapping burn severity in the western Italian Alps through phenologically coherent reflectance composites derived from Sentinel-2 imagery Type de document : Article/Communication Auteurs : Donato Morresi, Auteur ; Raffaella Marzano, Auteur ; Emanuele Lingua, Auteur ; et al., Auteur Année de publication : 2022 Article en page(s) : n° 112800 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] carte de la végétation [Termes IGN] cartographie des risques [Termes IGN] détection de changement [Termes IGN] forêt alpestre [Termes IGN] image multibande [Termes IGN] image Sentinel-MSI [Termes IGN] incendie de forêt [Termes IGN] phénologie [Termes IGN] Piémont (Italie) [Termes IGN] réflectance spectrale [Termes IGN] risque naturel [Termes IGN] variation saisonnière [Termes IGN] zone sinistrée Résumé : (auteur) Deriving burn severity from multispectral satellite data is a widely adopted approach to infer the degree of environmental change caused by fire. Burn severity maps obtained by thresholding bi-temporal indices based on pre- and post-fire Normalized Burn Ratio (NBR) can vary substantially depending on temporal constraints such as matched acquisition and optimal seasonal timing. Satisfying temporal requirements is crucial to effectively disentangle fire and non-fire induced spectral changes and can be particularly challenging when only a few cloud-free images are available. Our study focuses on 10 wildfires that occurred in mountainous areas of the Piedmont Region (Italy) during autumn 2017 following a severe and prolonged drought period. Our objectives were to: (i) generate reflectance composites using Sentinel-2 imagery that were optimised for seasonal timing by embedding spatial patterns of long-term land surface phenology (LSP); (ii) produce and validate burn severity maps based on the modelled relationship between bi-temporal indices and field data; (iii) compare burn severity maps obtained using either a pair of cloud-free Sentinel-2 images, i.e. paired images, or reflectance composites. We proposed a pixel-based compositing algorithm coupling the weighted geometric median and thematic spatial information, e.g. long-term LSP metrics derived from the MODIS Collection 6 Land Cover Dynamics Product, to rank all the clear observations available in the growing season. Composite Burn Index data and bi-temporal indices exhibited a strong nonlinear relationship (R2 > 0.85) using paired images or reflectance composites. Burn severity maps attained overall classification accuracy ranging from 76.9% to 83.7% (Kappa between 0.61 and 0.72) and the Relative differenced NBR (RdNBR) achieved the best results compared to other bi-temporal indices (differenced NBR and Relativized Burn Ratio). Improvements in overall classification accuracy offered by the calibration of bi-temporal indices with the dNBR offset were limited to burn severity maps derived from paired images. Reflectance composites provided the highest overall classification accuracy and differences with paired images were significant using uncalibrated bi-temporal indices (4.4% to 5.2%) while they decreased (2.8% to 3.2%) when we calibrated bi-temporal indices derived from paired images. The extent of the high severity category increased by ~19% in burn severity maps derived from reflectance composites (uncalibrated RdNBR) compared to those from paired images (calibrated RdNBR). The reduced contrast between healthy and burnt conditions associated with suboptimal seasonal timing caused an underestimation of burnt areas. By embedding spatial patterns of long-term LSP metrics, our approach provided consistent reflectance composites targeted at a specific phenological stage and minimising non-fire induced inter-annual changes. Being independent from the multispectral dataset employed, the proposed pixel-based compositing approach offers new opportunities for operational change detection applications in geographic areas characterised by persistent cloud cover. Numéro de notice : A2022-095 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1016/j.rse.2021.112800 Date de publication en ligne : 22/11/2021 En ligne : https://doi.org/10.1016/j.rse.2021.112800 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99534 [article]

Latent heat flux variability and response to drought stress of black poplar: A multi-platform multi-sensor remote and proximal sensing approach to relieve the data scarcity bottleneck / Flavia Tauro in Remote sensing of environment, vol 268 (January 2022)  

Public [article]  inRemote sensing of environment > vol 268 (January 2022) . - n° 112771 Titre : Latent heat flux variability and response to drought stress of black poplar: A multi-platform multi-sensor remote and proximal sensing approach to relieve the data scarcity bottleneck Type de document : Article/Communication Auteurs : Flavia Tauro, Auteur ; Antonino Maltese, Auteur ; Roberto Giannini, Auteur ; et al., Auteur Année de publication : 2022 Article en page(s) : n° 112771 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] bioénergie [Termes IGN] évapotranspiration [Termes IGN] gestion de l'eau [Termes IGN] image captée par drone [Termes IGN] image satellite [Termes IGN] irrigation [Termes IGN] Piémont (Italie) [Termes IGN] Populus nigra [Termes IGN] sécheresse [Termes IGN] stress hydrique Résumé : (auteur) High-throughput mapping of latent heat flux (λET) is critical to efforts to optimize water resources management and to accelerate forest tree breeding for improved drought tolerance. Ideally, investigation of the energy response at the tree level may promote tailored irrigation strategies and, thus, maximize crop biomass productivity. However, data availability is limited and planning experimental campaigns in the field can be highly operationally complex. To this end, a multi-platform multi-sensor observational approach is herein developed to dissect the λET signature of a black poplar (Populus nigra) breeding population (“POP6”) at the canopy level. POP6 comprised more than 4600 trees representing 503 replicated genotypes, whose parents were derived from contrasting environmental conditions. Trees were trialed in two adjacent plots where different irrigation treatments (moderate drought [mDr] and well-watered [WW]) were applied. Data collected from satellite and unmanned aerial vehicles (UAVs) remote sensing as well as from ground-based proximal sensors were integrated at consistent spatial aggregation and combined to compute the surface energy balance of the trees through a modified Priestley-Taylor method. Here, we demonstrated that λET response was significantly different between WW and mDr trees, whereby genotypes in mDr conditions exhibited larger standard deviations. Importantly, genotypes classified as drought tolerant based on the stress susceptibility index (SSI) presented λET values significantly higher than the rest of the population. This study confirmed that water limitation in mDr settings led to reduced soil moisture in the tree root zone and, thus, to lower λET. These results pave the way to breeding poplar and other bioenergy crops with this underexploited trait for higher λET. Most notably, the illustrated work demonstrates a multi-platform multi-sensor data fusion approach to tackle the global challenge of monitoring landscape-scale ecosystem processes at fine resolution. Numéro de notice : A2022-087 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.1016/j.rse.2021.112771 Date de publication en ligne : 05/11/2021 En ligne : https://doi.org/10.1016/j.rse.2021.112771 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99496 [article]

Urban geomorphology of a historical city straddling the Tanaro River (Alessandria, NW Italy) / Andrea Mandarino in Journal of maps, vol 17 n° 4 (October 2021)  

Public [article]  inJournal of maps > vol 17 n° 4 (October 2021) . - pp 29 - 41 Titre : Urban geomorphology of a historical city straddling the Tanaro River (Alessandria, NW Italy) Type de document : Article/Communication Auteurs : Andrea Mandarino, Auteur ; Fabio Luino, Auteur ; Laura Turconi, Auteur ; et al., Auteur Année de publication : 2021 Article en page(s) : pp 29 - 41 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] analyse diachronique [Termes IGN] carte ancienne [Termes IGN] carte géomorphologique [Termes IGN] cartographie historique [Termes IGN] étalement urbain [Termes IGN] géomorphologie locale [Termes IGN] historique des données [Termes IGN] paysage urbain [Termes IGN] Piémont (Italie) [Termes IGN] planification urbaine [Termes IGN] Pô (plaine) [Termes IGN] système d'information géographique Résumé : (auteur) The integration of field surveys, bibliographic research and multitemporal analysis of historical maps, aerial photographs and satellite images in a GIS environment, allowed the current and past geomorphological features of the old city of Alessandria and its surrounding areas, NW Italy, to be identified and mapped. Their analysis provided an overview of the geomorphological evolution of the city that is strictly related to the historical vicissitudes occurred since the Middle Ages. Nowadays, the most representative landforms and deposits characterizing the urban landscape result from human interventions and are associated with ancient military facilities and infrastructures, a historical man-made channel network no longer recognizable, the Tanaro riverbed channelization, and the urban sprawl occurred from the second half of the nineteenth century onwards. This study represents a useful tool for urban planning and management and for raising the citizens’ awareness of the urban-landscape geomorphological features and evolution, and therefore the geo-hydrological risk. Numéro de notice : A2021-923 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/17445647.2020.1746420 Date de publication en ligne : 29/03/2020 En ligne : https://doi.org/10.1080/17445647.2020.1746420 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=99280 [article]

Aerial and UAV images for photogrammetric analysis of Belvedere Glacier evolution in the period 1977–2019 / Carlo Lapige De Gaetani in Remote sensing, vol 13 n° 18 (September-2 2021)  

Public [article]  inRemote sensing > vol 13 n° 18 (September-2 2021) . - n° 3787 Titre : Aerial and UAV images for photogrammetric analysis of Belvedere Glacier evolution in the period 1977–2019 Type de document : Article/Communication Auteurs : Carlo Lapige De Gaetani, Auteur ; Francesco Loli, Auteur ; Livio Pinto, Auteur Année de publication : 2021 Article en page(s) : n° 3787 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse diachronique [Termes IGN] changement climatique [Termes IGN] données maillées [Termes IGN] glacier [Termes IGN] glaciologie [Termes IGN] historique des données [Termes IGN] image aérienne [Termes IGN] image captée par drone [Termes IGN] masque [Termes IGN] modèle numérique de surface [Termes IGN] Piémont (Italie) [Termes IGN] point d'appui [Termes IGN] restitution analogique [Termes IGN] structure-from-motion Résumé : (auteur) Alpine glaciers are strongly suffering the consequences of the temperature rising and monitoring them over long periods is of particular interest for climate change tracking. A wide range of techniques can be successfully applied to survey and monitor glaciers with different spatial and temporal resolutions. However, going back in time to retrace the evolution of a glacier is still a challenging task. Historical aerial images, e.g., those acquired for regional cartographic purposes, are extremely valuable resources for studying the evolution and movement of a glacier in the past. This work analyzed the evolution of the Belvedere Glacier by means of structure from motion techniques applied to digitalized historical aerial images combined with more recent digital surveys, either from aerial platforms or UAVs. This allowed the monitoring of an Alpine glacier with high resolution and geometrical accuracy over a long span of time, covering the period 1977–2019. In this context, digital surface models of the area at different epochs were computed and jointly analyzed, retrieving the morphological dynamics of the Belvedere Glacier. The integration of datasets dating back to earlier times with those referring to surveys carried out with more modern technologies exploits at its full potential the information that at first glance could be thought obsolete, proving how historical photogrammetric datasets are a remarkable heritage for glaciological studies. Numéro de notice : A2021-753 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.3390/rs13183787 Date de publication en ligne : 21/09/2021 En ligne : https://doi.org/10.3390/rs13183787 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=98745 [article]

Réflexions d’une paysagiste sur la progression des boisements spontanés dans les Alpes et les Pyrénées / Françoise Copin in Revue forestière française, vol 71 n° 4-5 (2019)  

Public [article]  inRevue forestière française > vol 71 n° 4-5 (2019) . - pp 423 - 436 Titre : Réflexions d’une paysagiste sur la progression des boisements spontanés dans les Alpes et les Pyrénées Type de document : Article/Communication Auteurs : Françoise Copin, Auteur Année de publication : 2019 Article en page(s) : pp 423 - 436 Note générale : bibliographie Langues : Français (fre) Descripteur : [Termes IGN] Alpes (France) [Termes IGN] aménagement forestier [Termes IGN] boisement naturel [Termes IGN] carte forestière [Termes IGN] feuillu [Termes IGN] forêt [Termes IGN] forêt alpestre [Termes IGN] histoire [Termes IGN] Moyen-Age [Termes IGN] Piémont (Italie) [Termes IGN] Pinophyta [Termes IGN] Pyrénées (montagne) [Termes IGN] typologie forestière [Vedettes matières IGN] Sylviculture Résumé : (auteur) Dans de nombreuses vallées des Alpes et des Pyrénées, la forêt est revenue sur des lieux autrefois habités, cultivés ou pâturés. Elle incarne le retour d’un sauvage qui s’inscrit en creux d’activités domestiques qui per- sistent (alpages, fonds de vallées). Deux hauts de vallées se rencontrant au col de Tende serviront d’exemple pour illustrer l’évolution des regards sur la forêt et proposer des pistes d’un projet de paysage cherchant l’équilibre entre des lieux domestiques et des espaces sauvages. Après cette approche, issue de son travail de fin d’études à l’École de la Nature et du Paysage de Blois, l’auteur propose un éclairage plus sociologique nourri par une enquête dans la vallée du Vicdessos. Des communes du Parc naturel régional des Pyrénées ariégeoises y conduisent des ouvertures paysagères en réaction à la progression du couvert forestier autour des villages. Ces interventions très localisées répondent à des enjeux écologiques de restauration de milieux ouverts, mais témoignent aussi et surtout d’un besoin de contrôle des habitats forestiers et de la faune asso- ciée. Dans les deux cas, le chantier est ouvert pour imaginer de nouveaux liens aux boisements spontanés. Numéro de notice : A2019-648 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.4267/2042/70824 En ligne : https://doi.org/10.4267/2042/70824 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97019 [article]

Suivis topométriques et géodésiques liés au projet de liaison ferroviaire entre Lyon et Turin / M. Boissenot in XYZ, n° 119 (juin - août 2009) 

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Snow cover monitoring in Alpine regions using ENVISAT optical data / M. Pepe in International Journal of Remote Sensing IJRS, vol 26 n° 21 (November 2005)  

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Travaux réalisés par l'Institut Géographique National pour l'élaboration des références géodésique et altimétrique de la liaison Lyon-Turin ferroviaire / Alain Harmel (2005)

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Les plans parcellaires de 1728 et leur influence sur la cartographie de la Savoie / R. Loeb (1990)

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Les Alpes occidentales : le versant piémontais, Tome 6. Partie 2 / Raoul Blanchard (1954)

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Les Alpes occidentales : le versant piémontais, Tome 6. Partie 1 / Raoul Blanchard (1952)

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