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The French NFI : flexibility at the heart of the design / François Morneau (2019)

Public Titre : The French NFI : flexibility at the heart of the design Type de document : Article/Communication Auteurs : François Morneau , Auteur ; Stéphanie Wurpillot , Auteur ; Jean-Daniel Bontemps , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2019 Conférence : Conference 2019, A century of national forest inventories – informing past, present and future decisions 19/05/2019 21/05/2019 Oslo Norvège programme sans actes Langues : Anglais (eng) Descripteur : [Termes IGN] échantillonnage [Termes IGN] estimateur [Termes IGN] inventaire forestier (techniques et méthodes) [Termes IGN] inventaire forestier national (données France) [Termes IGN] modèle numérique de surface de la canopée [Vedettes matières IGN] Inventaire forestier Résumé : (auteur) Introduction : The growing demands of society on forests have pushed forward NFIs who had to evolve and adapt over time. However, in a context of forests being at the center of many challenges, reactivated by global changes, this adaptation has been particularly accelerated in recent years. The demands now comes from a broader public (national/international policy makers, industries, environmental organisations, research, people) who is seeking for more information, more precise and easily accessible. In order to respond to these demands, some NFIs are moving from a knowledge tool on forests to a somehow environmental monitoring system. These renewed inventories must be able to easily integrate new (diverse) needs and to be reactive in case of dramatic perturbations (fires, storms, massive dieback). In this context, NFIs must be powerful, responsive and easily adaptable tools. This involves a change in their design, from the sampling plan, to the provision of baseline information through revised estimation techniques using more and more auxiliary information, often derived from remote sensing. The purpose of the communication is to present the innovations implemented or under development in the French inventory to adapt a quite old (now 60 years) tool to this new context. Materials and methods: The communication will present the recent changes in the French NFI :•sampling design (continuous inventory);•estimators and the use of external data thanks to post-stratification. Results: We will insist on the search for flexibility of the French NFI design and the information system actually developed :•On the fly production of results via specific tools;•Easy addition, combination of new variables;•Improvement of estimates thanks to new data via post-stratification (DHM);•Derivation of the national tool to specific case (regional) studies : on demand inventories.•Reactivity after events like storms. Conclusion: A NFI is a work in progress, always evolving to address new needs, gain more precision, a finest resolution... at constant or decreasing costs. New solutions have to be found, new auxiliary data have to be mobilised in order to answer the multiple demands. Achieving that necessitate to find or form the future engineers and researchers who will build the next generation of NFIs. This question is crucial in a domain where human resources are rare. Numéro de notice : C2019-062 Affiliation des auteurs : LIF (2012-2019) Thématique : FORET Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96977

Toward the development of total volume and biomass functions using terrestrial lidar and NFI data / Cédric Vega (2019) 

Public Titre : Toward the development of total volume and biomass functions using terrestrial lidar and NFI data Type de document : Article/Communication Auteurs : Cédric Vega , Auteur ; Jan Hackenberg , Auteur ; Lina Jarboui , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2019 Conférence : Conference 2019, A century of national forest inventories – informing past, present and future decisions 19/05/2019 21/05/2019 Oslo Norvège programme sans actes Langues : Anglais (eng) Descripteur : [Termes IGN] biomasse forestière [Termes IGN] données lidar [Termes IGN] inventaire forestier national (données France) [Termes IGN] volume en bois [Vedettes matières IGN] Inventaire forestier Résumé : (auteur) Introduction : The diversification of wood usages and the information needs for international reporting require detailed information on total tree volume and biomass. National Forest Inventories have traditionally estimated merchantable volume based on diameter and height measures and allometric models, but they need to get new efficient ways to estimate of total tree volume and biomass (Vallet et al. 2006). In France, current approaches suffer from databases restricted to a limited number of species or tree size range (Henry et al. 2010), and their long term validity could be limited by the impact of climate change on tree growth (Charru et al. 2017). Terrestrial Laser Scanning (TLS) is seen as a promising tool to model tree geometry and estimate total tree volume and biomass without- or limited - destructive measurements. Various approaches have been proposed in the litterature to extract tree attributes, from single measurements (i.e. dbh) to full tree reconstruction (Liang et al. 2018). The latter were initially developed for tree-level processing and relied on of very high density points clouds. Such point clouds were found suitable to estimate total tree volume and biomass. The challenge for NFIs is to acquire and process TLS data acquired over a large number of forest plots at a marginal cost. The purpose of this presentation is to provide experience feedback on the development of such a paradigm in the French NFI. Materials and methods: The TLS processing chain included both data acquisition protocols and point cloud processing methods. The acquisition part started in 2010 with 4 scan positions per plot, without any additional field measurements. After scanning ~ 1,500 plots, this setup was revised in 2016 to improve the point cloud quality and validation data. The current setup includes 9 scans per plot in a 10 m circle. The traditional volume table protocol is currently applied to obtain additional measurements along the main stem. The point cloud processing chain was implemented under Computree processing platform in the framework of the H2020-project DIABOLO, to extract individual tree geometry and volume. It is based on the SimpleTree approach (Hackenberg et al. 2015), and includes the following main steps: terrain modelling, tree localisation and segmentation, tree reconstruction and consolidation, and volume computation. It was tested on both NFI (25 plots) data and detailed databases based on destructive sample from various sources (Lin2Value, Emerge projects, 76 trees). Results: The developed method allowed to estimate total tree volume with a mean error of -0.1 m3(±0.4 SD) and a RMSE of 23.47%. In terms of NFI measurements, the DBH and Diameter at 2.6 m were estimated with a precision of 0.24 cm (±0.4 SD) or 0.27 cm (± 1.95 SD) and RMSE of respectively 5.82 % and 8.93 %. As regards cut height and total tree heights, errors were 0.78 m (± 2.5 SD) and 1.48 m (± 1.93 SD). The corresponding RMSE were 27.91 % and 13.84 % respectively(Hackenberg et al. 2017). Conclusion: The current TLS data acquisition and processing chain provides promising results towardthe development of total volume and biomass functions for NFIs. Future work will focus on improving the field validation protocols and the reconstruction method of the upper canopy, where the point density is limited due to distance and occlusions. Numéro de notice : C2019-061 Affiliation des auteurs : LIF+Ext (2012-2019) Thématique : FORET Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96978

Documents numériques

peut être téléchargé c2019-071-towards an improved forest inventory _Jarboui Adobe Acrobat PDF

Towards an improved forest inventory using terrestrial laser scanning / Lina Jarboui (2019) 

Public Titre : Towards an improved forest inventory using terrestrial laser scanning Type de document : Article/Communication Auteurs : Lina Jarboui , Auteur ; Cédric Vega , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2019 Conférence : Conference 2019 Terrestrial laser scanning in forest ecology : Expanding the Horizon 01/05/2019 01/05/2019 Gent Belgique programme sans actes Langues : Anglais (eng) Descripteur : [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] inventaire forestier (techniques et méthodes) [Termes IGN] lasergrammétrie [Termes IGN] télémétrie laser terrestre [Vedettes matières IGN] Inventaire forestier Résumé : (auteur) International reporting and societal demand require information on total wood volume and biomass. National Forest Inventories collect most of the time information on the main stem. Volume and biomass equations exist to estimate totals from the stem. However, they are most often based on small databases that do not represent all the forest conditions. Acquiring total volume and biomass data require costly and time consuming destructive measurements that are not suited to NFI protocols. Terrestrial Lidar data allow to generate very detailed and accurate information on the plot structure. The geometric reconstruction of tree point cloud provides the necessary information to produce innovative total volume and biomass functions. French NFI developed acquisition and processing protocols to satisfy these objectives. Numéro de notice : C2019-071 Affiliation des auteurs : LIF (2012-2019) Thématique : FORET Nature : Poster nature-HAL : Poster-avec-CL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97420

Documents numériques

peut être téléchargé Towards an improved forest inventory using TLS - poster Adobe Acrobat PDF

Towards fully automatic orthophoto & DSM generation [diaporama] / Sébastien Giordano (2019)  

Public contenu dans Workshop on Geoprocessing and Archiving of historical Aerial Images, IGN-France, Paris, June 3rd to 4th, 2019 / Clément Mallet (2019)   Titre : Towards fully automatic orthophoto & DSM generation [diaporama] Type de document : Article/Communication Auteurs : Sébastien Giordano , Auteur ; Arnaud Le Bris , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2019 Projets : VOLTA / Vallet, Bruno Conférence : Workshop 2019 on Geoprocessing and Archiving of historical Aerial Images 03/06/2019 04/06/2019 Saint-Mandé France programme sans actes Importance : 43 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Termes IGN] chaîne de traitement [Termes IGN] géoréférencement indirect [Termes IGN] modèle numérique de terrain [Termes IGN] orientation absolue [Termes IGN] orientation relative [Termes IGN] orthoimage [Termes IGN] point d'appui [Termes IGN] points homologues Numéro de notice : C2019-047 Affiliation des auteurs : LASTIG MATIS (2012-2019) Thématique : IMAGERIE Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans En ligne : http://www.eurosdr.net/sites/default/files/images/inline/06_giordano_lebris.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95519

Valorisation de récits de vie de Républicains espagnols / Catherine Dominguès (2019) 

Public Titre : Valorisation de récits de vie de Républicains espagnols Type de document : Article/Communication Auteurs : Catherine Dominguès , Auteur ; Laurence Jolivet , Auteur ; Carmen Brando , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2019 Projets : MATRICIEL / Vallet, Bruno Conférence : EGC 2019, Atelier DAHLIA 22/01/2019 22/01/2019 Metz France Open Access Proceedings Importance : pp 82 - 84 Note générale : bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Analyse spatiale [Termes IGN] corpus [Termes IGN] Espagne [Termes IGN] récit [Termes IGN] représentation cartographique [Termes IGN] traitement du langage naturel [Termes IGN] vingtième siècle Résumé : (auteur) Ce travail vise à analyser des récits de vie de Républicains espagnols sous l’angle des lieux désignés et d’en proposer une représentation cartographique. Cette analyse combinée montre l’interdépendance des questions linguistiques et cartographiques soulevées. Numéro de notice : C2019-041 Affiliation des auteurs : LASTIG COGIT+Ext (2012-2019) Thématique : GEOMATIQUE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésNat DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95412

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en open access Valorisation de récits de vie de Républicains espagnols - pdf éditeur Adobe Acrobat PDF

Zoome encore un peu … Une interface de saisie de données géographiques qui permet d’être au bon niveau de détail / Guillaume Touya (2019)  

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27èmes Journées de la Recherche de l'IGN / Journées Recherche de l'IGN 2018, 27es Journées (22 - 23 mars 2018; Cité Descartes, Champs-sur-Marne, France) (2018)  

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Adéquation algorithme architecture pour la localisation basée image sur système embarqué / David Vandergucht (2018)    

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Apprentissage de modalités auxiliaires pour la localisation basée vision / Nathan Piasco (2018)    

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Une approche adaptative pour lier des données géoréférencées du Web / Abdelfettah Feliachi (2018)

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Bilan de l’Action COST ES1206 - GNSS4SWEC (Advanced Global Navigation Satellite Systems tropospheric products for monitoring severe weather events and climate) / Olivier Bock (2018)

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Bruit de scintillation dans les séries temporelles de positions GNSS : origines et conséquences / Paul Rebischung (2018) 

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Caméra SUSPECT (SUper-SPECTrale) du LOEMI : de la suspicion à la mise à l'épreuve / Olivier Martin (2018) 

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Carbone dans les sols forestiers, de l'étude des processus aux patrons à l'échelle nationale : enjeux et méthodologies / Laurent Saint André (2018) 

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Classification à très haute résolution (THR) spatiale et fusion d'occupation des sols (OCS) / Tristan Postadjian (2018) 

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