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Pure and even-aged forestry of fast growing conifers under climate change: on the need of a silvicultural paradigm shift / Clémentine Ols in Environmental Research Letters, vol 16 n° 2 (February 2021)    

Public [article]  inEnvironmental Research Letters > vol 16 n° 2 (February 2021) . - n° 024030 Titre : Pure and even-aged forestry of fast growing conifers under climate change: on the need of a silvicultural paradigm shift Type de document : Article/Communication Auteurs : Clémentine Ols , Auteur ; Jean-Daniel Bontemps , Auteur Année de publication : 2021 Projets : ARBRE/RESFORCLIM / Article en page(s) : n° 024030 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] changement climatique [Termes IGN] croissance végétale [Termes IGN] inventaire forestier national (données France) [Termes IGN] Picea abies [Termes IGN] Pinophyta [Termes IGN] Pinus sylvestris [Termes IGN] plantation forestière [Termes IGN] politique forestière [Termes IGN] Préalpes (Europe) [Termes IGN] production primaire brute [Termes IGN] Pseudotsuga menziesii [Termes IGN] résilience écologique [Termes IGN] sylviculture [Termes IGN] Union Européenne [Vedettes matières IGN] Economie forestière Résumé : (auteur) Pure and even-aged (PEA) forests of fast growing conifer species have for long been key providers of industrial raw material. Despite recent concern regarding their greater sensitivity to major natural disturbances, their impacts onto biodiversity and their funding efficiency, PEA conifer forests could remain a major economic target given the ongoing European strategy for bioeconomy. These forests are encountered across contrasted climates and in both native and introduced contexts across Europe giving rise to high uncertainties regarding their growth responses to current climate change. Using the French national forest inventory data, we inquired the radial growth of eight major conifer species in European forestry across 16 regional native and introduced PEA forest systems (n > 10,000 trees). Growth trends over the 2006-2016 period exhibited a negative association with absolute growth level in 2006, with strongest negative trends found for emblematic PEA forestry species (e.g. Norway spruce and Douglas-fir), and strongest positive trends for pine species (e.g. Scots pine). While the greater growth rate advantage of some species may shorten rotation and lower risk exposures for future decades, recent lowered productivity may affect the forest sector in the long run. The prevalence of PEA forests across European forest landscapes and their increasingly reported lower resilience to climate change compared to more complex forest systems call for the establishment of a long-term European forest policy strategy. Maintaining the environmental, social and economic benefits of forests should remain a priority in the European agenda, regardless of the financial costs at stake. Numéro de notice : A2021-060 Affiliation des auteurs : LIF (2020- ) Autre URL associée : vers HAL Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1088/1748-9326/abd6a7 Date de publication en ligne : 24/12/2020 En ligne : https://doi.org/10.1088/1748-9326/abd6a7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=96732 [article]

Documents numériques

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Automatic mapping of forest stands based on three-dimensional point clouds derived from terrestrial laser-scanning / Tim Ritter in Forests, vol 8 n° 8 (August 2017)  

Public [article]  inForests > vol 8 n° 8 (August 2017) Titre : Automatic mapping of forest stands based on three-dimensional point clouds derived from terrestrial laser-scanning Type de document : Article/Communication Auteurs : Tim Ritter, Auteur ; Marcel Schwarz, Auteur ; Andreas Tockner, Auteur ; Friedrich Leisch, Auteur ; Arne Nothdurft, Auteur Année de publication : 2017 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Abies alba [Termes IGN] analyse de groupement [Termes IGN] Autriche [Termes IGN] diamètre à hauteur de poitrine [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] Fagus sylvatica [Termes IGN] inventaire forestier (techniques et méthodes) [Termes IGN] Larix decidua [Termes IGN] peuplement forestier [Termes IGN] Picea abies [Termes IGN] Pinus sylvestris [Termes IGN] Préalpes (Europe) [Termes IGN] semis de points [Vedettes matières IGN] Inventaire forestier Résumé : (Auteur) Mapping of exact tree positions can be regarded as a crucial task of field work associated with forest monitoring, especially on intensive research plots. We propose a two-stage density clustering approach for the automatic mapping of tree positions, and an algorithm for automatic tree diameter estimates based on terrestrial laser-scanning (TLS) point cloud data sampled under limited sighting conditions. We show that our novel approach is able to detect tree positions in a mixed and vertically structured stand with an overall accuracy of 91.6%, and with omission- and commission error of only 5.7% and 2.7% respectively. Moreover, we were able to reproduce the stand’s diameter in breast height (DBH) distribution, and to estimate single trees DBH with a mean average deviation of ±2.90 cm compared with tape measurements as reference. Numéro de notice : A2017-876 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/f8080265 Date de publication en ligne : 25/07/2017 En ligne : https://doi.org/10.3390/f8080265 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91195 [article]

Change detection and deformation analysis in point clouds: Application to rock face monitoring / Marco Scaioni in Photogrammetric Engineering & Remote Sensing, PERS, vol 79 n° 5 (May 2013)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 79 n° 5 (May 2013) . - pp 441 - 455 Titre : Change detection and deformation analysis in point clouds: Application to rock face monitoring Type de document : Article/Communication Auteurs : Marco Scaioni, Auteur ; Riccardo Roncella, Auteur ; Mario Ivan Alba, Auteur Année de publication : 2013 Article en page(s) : pp 441 - 455 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] analyse comparative [Termes IGN] analyse diachronique [Termes IGN] détection de changement [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] éboulement [Termes IGN] falaise [Termes IGN] filtrage de la végétation [Termes IGN] image RVB [Termes IGN] Italie [Termes IGN] montagne [Termes IGN] Préalpes (Europe) [Termes IGN] semis de points [Termes IGN] télémétrie laser terrestre Résumé : (Auteur) The paper outlines a method to compare two digital surfaces of the same rock face to detect major changes resulting from detached rocks and deformations. A terrestrial laser scanning survey is used for data gathering. After georeferencing, if the cliff has a complex morphology, a 3D segmentation algorithm is applied to split the whole rock surface into more subregions with an almost planar structure. In each subregion the raw point cloud is resampled on a regular grid and multitemporal differences are analyzed. Anomalies in differences, which should be very close to zero if no geometric variations have occurred, are identified with the following purposes: (a) localizing gross changes due to rock detachments, (b) removing global rigid-body displacements, and (c) understanding local cliff deformations. In the case where the rock face is covered by vegetation, this has to be filtered out, e.g., by visual inspection of RGB images co-registered to the point cloud. This paper also describes a procedure to carry out vegetation filtering in automatic way from the analysis of near-infrared images captured by a camera integrated to laser scanner. The application of the full processing pipeline has been tested on a real case study located in the Italian pre-alpine area. Here, after filtering some vegetation, a total rock fall volume of 0.15 m3 was detected on a cliff of about 375 m2 and within a period of six months. Numéro de notice : A2013-282 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.79.5.441 En ligne : https://doi.org/10.14358/PERS.79.5.441 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32420 [article]

Erdgezeitenbeobachtungen mit Vertikalpendeln von 1970 bis 1977 im Bayerischen Alpenvorland durch die Abteilung I des Deutschen Geodätischen Forschungsinstituts / H. Schmitz-Hubsch (1979)

Public Titre : Erdgezeitenbeobachtungen mit Vertikalpendeln von 1970 bis 1977 im Bayerischen Alpenvorland durch die Abteilung I des Deutschen Geodätischen Forschungsinstituts Titre original : [Observations des marées terrestres au pendule vertical de 1970 à 1977 dans les Préalpes bavaroises par la division 1 de l'institut allemand de recherche géodésique] Type de document : Monographie Auteurs : H. Schmitz-Hubsch, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1979 Collection : DGK - B Sous-collection : Angewandte Geodäsie num. 241 Importance : 76 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8535-0 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] Bavière (Allemagne) [Termes IGN] marée terrestre [Termes IGN] pendule [Termes IGN] Préalpes (Europe) Index. décimale : 30.43 Travaux de géodésie physique Résumé : (Auteur) In an Upper Bavarian area of 12 x 30 km2extent, consisting of two profiles with 5 boreholes each in geologically different layers, horizontal tidal acceleration were measured by 2 ASKANIA borehole tiltmeters in a first campaign from 1970 to 1975, and by 4 ASKANIA borehole tiltmeters in a second campaign from 1976 to 1977. Both measurements resulted in showing a dependence of the derived tidal parameters on the geological layers of the unfolded and the folded Molasse and of the calcareous Alps. Moreover, a seasonal dependence of these parameters was shown. The parameters were calculated to be invariant in regard of turns and exchanges of the pendulums in the stations. The directions of the periodic drift vectors proved to correlate with the uplifts of the boreholes caused by the drilling engineering. On two stations, an earthquake produced sudden identical drift vectors which, after one or two days, turned again into local directions. Mountains, towering up to 1400 m close by a station caused local rock pressures whose influence upon the tidal measurements - continuous or intermittent - is yet unclear. 8 years after the completion of the boreholes, the main values of the aperiodic drift vectors have decreased only to about 60 percents. At present, the drift rates of the boreholes still are too big for the investigation of geodynamic effects. Numéro de notice : 28271 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63614

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28271-01	30.43	Livre	Centre de documentation	Géodésie	Disponible