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Genetic variation of introduced red oak (Quercus rubra) stands in Germany compared to North American populations / Tim Pettenkofer in European Journal of Forest Research, vol 139 n° 2 (April 2020)  

Public [article]  inEuropean Journal of Forest Research > vol 139 n° 2 (April 2020) . - pp 321 – 331 Titre : Genetic variation of introduced red oak (Quercus rubra) stands in Germany compared to North American populations Type de document : Article/Communication Auteurs : Tim Pettenkofer, Auteur ; Reiner Finkeldey, Auteur ; Markus Müller, Auteur ; et al., Auteur Année de publication : 2020 Article en page(s) : pp 321 – 331 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Allemagne [Termes IGN] Amérique du nord [Termes IGN] analyse comparative [Termes IGN] génétique forestière [Termes IGN] Quercus rubra [Termes IGN] variation Résumé : (auteur) Although Northern red oak (Quercus rubra L.) is the most important introduced deciduous tree species in Germany, only little is known about its genetic variation. For the first time, we describe patterns of neutral and potentially adaptive nuclear genetic variation in Northern red oak stands across Germany. For this purpose, 792 trees were genotyped including 611 trees from 12 stands in Germany of unknown origin and 181 trees from four populations within the natural distribution area in North America. Our marker set included 12 potentially adaptive (expressed sequence tag-derived simple sequence repeat = EST SSR) and 8 putatively selectively neutral nuclear microsatellite (nSSR) markers. Our results showed that German stands retain comparatively high levels of genetic variation at both EST-SSRs and nSSRs, but are more similar to each other than to North American populations. These findings are in agreement with earlier chloroplast DNA analyses which suggested that German populations originated from a limited geographic area in North America. The comparison between potentially adaptive and neutral microsatellite markers did not reveal differences in the analyzed diversity and differentiation measures for most markers. However, locus FIR013 was identified as a potential outlier locus. Due to the absence of signatures of selection in German stands, we suggest that introduced populations were established with material from provenances that were adapted to environmental conditions similar to those in Germany. However, we analyzed only a limited number of loci which are unlikely to be representative of adaptive genetic differences among German stands. Our results suggest that the apparent introduction from a limited geographic range in North America may go along with a reduced adaptive potential. Numéro de notice : A2020-345 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article DOI : 10.1007/s10342-019-01256-5 Date de publication en ligne : 18/01/2020 En ligne : https://doi.org/10.1007/s10342-019-01256-5 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95225 [article]

Repérage et identification automatiques de noms de lieux avec variations d'écriture dans des corpus / Mathilde Jouvel-Triollet (2019) 

Public Titre : Repérage et identification automatiques de noms de lieux avec variations d'écriture dans des corpus Type de document : Mémoire Auteurs : Mathilde Jouvel-Triollet, Auteur ; Catherine Dominguès , Encadrant ; Philippe Gambette, Encadrant Editeur : Grenoble [France] : Université Grenoble Alpes Année de publication : 2019 Importance : 84 p. Note générale : bibliographie Mémoire de master 2 mention Sciences du Langage, Parcours Industries de la Langue Langues : Français (fre) Descripteur : [Vedettes matières IGN] Toponymie [Termes IGN] corpus [Termes IGN] mesure de similitude [Termes IGN] reconnaissance de noms [Termes IGN] toponyme [Termes IGN] traitement du langage naturel [Termes IGN] variation Mots-clés libres : traitement automatique des langues (TAL)  variation d’écriture  néographie  corpus hétérogènes  reconnaissance d’entité nommée  mesure de similarité  Natural Language Processing (NLP)  toponym  placename  written variation  new written form  heterogeneous corpus  named entity recognition  string metric Résumé : (auteur) Les toponymes sont parfois amenés à subir des variations d’écriture et voient leur graphie s’éloigner de celle que nous trouvons habituellement dans les dictionnaires de noms propres. Ces variations d’écriture peuvent dépendre du type de corpus dont les toponymes sont issus, du registre, du temps ou du langage que couvre le corpus. Nous proposons une méthode pour identifier un toponyme, c’est-à-dire faire le lien entre un toponyme avec variations d’écriture et sa forme normée. Le présent mémoire se divise en trois parties. Dans une première partie, nous présenterons le terrain de stage. Dans un second temps, nous décrirons les missions confiées, puis nous exposerons l’approche envisagée ainsi que les outils utilisés pour répondre aux missions. Enfin, nous proposerons des solutions afin de répondre au mieux au besoin d’identification de toponymes avec variations d’écriture. // Toponyms can sometimes be the target of written variations and experience a different written form from what we usually find in proper names dictionaries. These written variations can depend on the type of the corpus the toponyms come from, the register, the time or the language that the corpus covers. We suggest a method to identify a toponym, which means making the link between a toponym with written variations and its normalised form. This Master’s thesis is divided into three parts. In the first part we will present the context of the internship. Then we will describe the given tasks and we will expound the contemplated approaches and the tools that we used. Finally, we will suggest solutions to meet at best the need of toponyms identification with written variations. Note de contenu : Introduction Partie 1. Présentation du terrain de stage 1. IGN 2. UPEM Partie 2. Objectifs (cahier des charges) 3. Étude du besoin 4. Méthodologie pour répondre à la demande 4.1. Identification de noms de lieux 4.2. Repérage des noms de lieux 4.3. Approche envisagée 5. Ressources et outils utilisés 5.1. Les corpus 5.2. Les gazetiers 5.3. Les mesures d’évaluation Partie 3. Réponse au cahier des charges 6. Identifier des toponymes 6.1. Introduction 6.2. Méthode 6.3. Résultats 6.4. Discussion 6.5. Variante du processus d’identification 7. Repérer des toponymes dans un corpus 7.1. Des mots déclencheurs 7.2. Des mots impossibles 8. Repérage et identification simultanés 8.1. Introduction 8.2. Méthode 8.3. Résultats 8.4. Discussion Conclusion Numéro de notice : 14517 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE/MATHEMATIQUE Nature : Mémoire masters divers Organisme de stage : LASTIG (IGN) Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102273

Documents numériques

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Improving the prediction of African savanna vegetation variables using time series of MODIS products / Miriam Tsalyuk in ISPRS Journal of photogrammetry and remote sensing, vol 131 (September 2017)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 131 (September 2017) . - pp 77 - 91 Titre : Improving the prediction of African savanna vegetation variables using time series of MODIS products Type de document : Article/Communication Auteurs : Miriam Tsalyuk, Auteur ; Maggi Kelly, Auteur ; Wayne M. Getz, Auteur Année de publication : 2017 Article en page(s) : pp 77 - 91 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes IGN] Afrique (géographie physique) [Termes IGN] biomasse forestière [Termes IGN] dégradation de la flore [Termes IGN] Enhanced vegetation index [Termes IGN] image Terra-MODIS [Termes IGN] Leaf Area Index [Termes IGN] Namibie [Termes IGN] Normalized Difference Vegetation Index [Termes IGN] prédiction [Termes IGN] savane [Termes IGN] variation Résumé : (Auteur) African savanna vegetation is subject to extensive degradation as a result of rapid climate and land use change. To better understand these changes detailed assessment of vegetation structure is needed across an extensive spatial scale and at a fine temporal resolution. Applying remote sensing techniques to savanna vegetation is challenging due to sparse cover, high background soil signal, and difficulty to differentiate between spectral signals of bare soil and dry vegetation. In this paper, we attempt to resolve these challenges by analyzing time series of four MODIS Vegetation Products (VPs): Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), Leaf Area Index (LAI), and Fraction of Photosynthetically Active Radiation (FPAR) for Etosha National Park, a semiarid savanna in north-central Namibia. We create models to predict the density, cover, and biomass of the main savanna vegetation forms: grass, shrubs, and trees. To calibrate remote sensing data we developed an extensive and relatively rapid field methodology and measured herbaceous and woody vegetation during both the dry and wet seasons. We compared the efficacy of the four MODIS-derived VPs in predicting vegetation field measured variables. We then compared the optimal time span of VP time series to predict ground-measured vegetation. We found that Multiyear Partial Least Square Regression (PLSR) models were superior to single year or single date models. Our results show that NDVI-based PLSR models yield robust prediction of tree density (R2 = 0.79, relative Root Mean Square Error, rRMSE = 1.9%) and tree cover (R2 = 0.78, rRMSE = 0.3%). EVI provided the best model for shrub density (R2 = 0.82) and shrub cover (R2 = 0.83), but was only marginally superior over models based on other VPs. FPAR was the best predictor of vegetation biomass of trees (R2 = 0.76), shrubs (R2 = 0.83), and grass (R2 = 0.91). Finally, we addressed an enduring challenge in the remote sensing of semiarid vegetation by examining the transferability of predictive models through space and time. Our results show that models created in the wetter part of Etosha could accurately predict trees’ and shrubs’ variables in the drier part of the reserve and vice versa. Moreover, our results demonstrate that models created for vegetation variables in the dry season of 2011 could be successfully applied to predict vegetation in the wet season of 2012. We conclude that extensive field data combined with multiyear time series of MODIS vegetation products can produce robust predictive models for multiple vegetation forms in the African savanna. These methods advance the monitoring of savanna vegetation dynamics and contribute to improved management and conservation of these valuable ecosystems. Numéro de notice : A2017-537 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2017.07.012 En ligne : https://doi.org/10.1016/j.isprsjprs.2017.07.012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=86575 [article]

Exemplaires(3)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2017091	RAB	Revue	Centre de documentation	En réserve L003	Disponible
081-2017093	DEP-EXM	Revue	LASTIG	Dépôt en unité	Exclu du prêt
081-2017092	DEP-EAF	Revue	Nancy	Dépôt en unité	Exclu du prêt

Comparisons of atmospheric mass variations derived from ECMWF reanalysis and operational fields, over 2003–2011 / E. Forootan in Journal of geodesy, vol 88 n° 5 (May 2014)  

Public [article]  inJournal of geodesy > vol 88 n° 5 (May 2014) . - pp 503 - 514 Titre : Comparisons of atmospheric mass variations derived from ECMWF reanalysis and operational fields, over 2003–2011 Type de document : Article/Communication Auteurs : E. Forootan, Auteur ; Olga Didova, Auteur ; M. Schumacher, Auteur ; J. Kusche, Auteur ; B. Elsaka, Auteur Année de publication : 2014 Article en page(s) : pp 503 - 514 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] analyse diachronique [Termes IGN] atmosphère terrestre [Termes IGN] données GRACE [Termes IGN] levé gravimétrique [Termes IGN] masse d'air [Termes IGN] variation Résumé : (Auteur) There are two spurious jumps in the atmospheric part of the Gravity Recovery and Climate Experiment-Atmosphere and Ocean De-aliasing level 1B (GRACE-AOD1B) products, which occurred in January-February of the years 2006 and 2010, as a result of the vertical level and horizontal resolution changes in the ECMWFop (European Centre for Medium-Range Weather Forecasts operational analysis). These jumps cause a systematic error in the estimation of mass changes from GRACE time-variable level 2 products, since GRACE-AOD1B mass variations are removed during the computation of GRACE level 2. In this short note, the potential impact of using an improved set of 6-hourly atmospheric de-aliasing products on the computations of linear trends as well as the amplitude of annual and semi-annual mass changes from GRACE is assessed. These improvements result from 1) employing a modified 3D integration approach (ITG3D), and 2) using long-term consistent atmospheric fields from the ECMWF reanalysis (ERA-Interim). The monthly averages of the new ITG3D-ERA-Interim de-aliasing products are then compared to the atmospheric part of GRACE-AOD1B, covering January 2003 to December 2010. These comparisons include the 33 world largest river basins along with Greenland and Antarctica ice sheets. The results indicate a considerable difference in total atmospheric mass derived from the two products over some of the mentioned regions. We suggest that future GRACE studies consider these through updating uncertainty budgets or by applying corrections to estimated trends and amplitudes/phases Numéro de notice : A2014-258 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0696-x Date de publication en ligne : 07/02/2014 En ligne : https://doi.org/10.1007/s00190-014-0696-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33161 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-2014051	SL	Revue	Centre de documentation	Revues en salle	Disponible

Climatological study of ionospheric irregularities over the European mid-latitude sector with GPS / Gilles Wautelet in Journal of geodesy, vol 88 n° 3 (March 2014)  

Public [article]  inJournal of geodesy > vol 88 n° 3 (March 2014) . - pp 223 - 240 Titre : Climatological study of ionospheric irregularities over the European mid-latitude sector with GPS Type de document : Article/Communication Auteurs : Gilles Wautelet, Auteur ; René Warnant, Auteur Année de publication : 2014 Article en page(s) : pp 223 - 240 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] analyse diachronique [Termes IGN] Belgique [Termes IGN] données GPS [Termes IGN] Europe (géographie politique) [Termes IGN] perturbation ionosphérique [Termes IGN] teneur totale en électrons [Termes IGN] variation [Termes IGN] variation temporelle Résumé : (Auteur) High-frequency variability of the ionosphere, or irregularities, constitutes the main threat for real-time precise positioning techniques based on Global Navigation Satellite Systems (GNSS) measurements. Indeed, during periods of enhanced ionospheric variability, GNSS users in the field—who cannot verify the integrity of their measurements—will experience positioning errors that can reach several decimeters, while the nominal accuracy of the technique is cm-level. In the frame of this paper, a climatological analysis of irregularities over the European mid-latitude region is presented. Based on a 10 years GPS dataset over Belgium, the work analyzes the occurrence rate (as a function of the solar cycle, season and local time) as well as the amplitude of ionospheric irregularities observed at a single GPS station. The study covers irregularities either due to space weather events (solar origin) or of terrestrial origin. If space weather irregularities are responsible for the largest effects in terms of ionospheric error, their occurrence rate highly depends on solar activity. Indeed, the occurrence rate of ionospheric irregularities is about 9 % during solar maximum, whereas it drops to about 0 % during medium or low solar activity periods. Medium-scale ionospheric disturbances (MSTIDs) occurring during daytime in autumn/winter are the most recurrent pattern of the time series, with yearly proportions slightly varying with the solar cycle and an amplitude of about 10 % of the TEC background. Another recurrent irregularity type, though less frequent than MSTIDs, is the noise-like variability in TEC observed during summer nighttime, under quiet geomagnetic conditions. These summer nighttime irregularities exhibit amplitudes ranging between 8 and 15 % of the TEC background. Numéro de notice : A2014-133 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0678-4 Date de publication en ligne : 11/12/2013 En ligne : https://doi.org/10.1007/s00190-013-0678-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33038 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-2014031	SL	Revue	Centre de documentation	Revues en salle	Disponible

Continental mass change from GRACE over 2002–2011 and its impact on sea level / O. Baur in Journal of geodesy, vol 87 n° 2 (February 2013)  

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Semisupervised learning of hyperspectral data with unknown land-cover classes / G. Jun in IEEE Transactions on geoscience and remote sensing, vol 51 n° 1 Tome 1 (January 2013)  

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Hyperspectral image denoising employing a spectral-spatial adaptive total variation model / Q. Yuan in IEEE Transactions on geoscience and remote sensing, vol 50 n° 10 Tome 1 (October 2012)  

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Effect of climatic cycles in Pacific Ocean on mean sea level variations over the Southwest Pacific Ocean and Tasman Sea / Anthony Wiart (2012) 

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Sensitivity of superconducting gravimeters in central Europe on variations in regional river and drainage basins / C. Kroner in Journal of geodesy, vol 85 n° 10 (October 2011)  

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Signature des séismes dans le champ de pesanteur / Isabelle Panet in XYZ, n° 127 (juin - août 2011) 

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Représentations en ondelettes du champ de pesanteur / Isabelle Panet in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011) 

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Signature des séismes dans le champ de pesanteur / Isabelle Panet in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011) 

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Evaluating terrestrial water storage variations from regionally constrained GRACE mascon data and hydrological models over Southern Africa: preliminary results / P. Krogh in International Journal of Remote Sensing IJRS, vol 31 n° 14 (July 2010)  

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vol 31 n° 13 - July /2010 - Special issue : Satellite observations of the Wenchuan earthquake of 12 may 2008 (Bulletin de International Journal of Remote Sensing IJRS) / Ranjit Singh

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