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Within- and between-tree variation of wood density components in Pinus nigra at six sites in Portugal / Alexandra Dias in Annals of Forest Science [en ligne], vol 75 n° 2 (June 2018)  

Public [article]  inAnnals of Forest Science [en ligne] > vol 75 n° 2 (June 2018) Titre : Within- and between-tree variation of wood density components in Pinus nigra at six sites in Portugal Type de document : Article/Communication Auteurs : Alexandra Dias, Auteur ; Maria João Gaspar, Auteur ; Ana Carvalho, Auteur ; Jani Pires, Auteur ; et al., Auteur Année de publication : 2018 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation [Termes descripteurs IGN] analyse de variance [Termes descripteurs IGN] base de données forestières [Termes descripteurs IGN] bois adulte [Termes descripteurs IGN] bois de jeunesse [Termes descripteurs IGN] croissance végétale [Termes descripteurs IGN] densité du bois [Termes descripteurs IGN] forêt alpestre [Termes descripteurs IGN] hétérogénéité environnementale [Termes descripteurs IGN] microdensitométrie [Termes descripteurs IGN] Pinus nigra [Termes descripteurs IGN] Portugal [Termes descripteurs IGN] résineux Résumé : (Auteur) Key message: In Europe, P. nigra wood presents a density pattern of longitudinal variation with an increase from east to west. However, no latitudinal tendencies were detected. Compared to other Portuguese resinous species, P. nigra revealed higher density, identical radial growth and intra-ring heterogeneity, which presents advantages for industry purposes. The environmental factors (Sites effect) manifest more strongly in the latewood components while the Trees/Sites effect is more strongly expressed in the earlywood components. Context: Although P. nigra Arnold is one of the most important conifers in Europe, little is known about the wood’s characteristics in the southwest European region. Aims: Our aims are to outline a first approach to study the growth and wood quality in P. nigra in Portugal comparing to other European natural stands and other resinous species. Methods: Inter- and intra-wood density variation of P. nigra from six Portuguese sites was studied using microdensitometry. Analysis of variance (ANOVA) was performed in three subsets: 50 common rings, core (juvenile wood) and peripheral analysis (mature wood). Results: The average ring density was 0.588 g cm−3, with maximum values in the north and low altitudes. Regarding growth traits, no latitudinal and altitudinal tendencies were detected. Compared to the main timber species in Portugal (P. pinaster Aiton), P. nigra showed similar radial growth, higher density but lower intra-ring density homogeneity. The Sites effect mainly influenced latewood density components, while the Trees/Sites effect primarily influenced earlywood components. The Rings effect was found to be relatively low, with a density decrease in the tree’s first years followed by an increase in the periphery. Growth traits showed a reduction from pith to bark. Conclusion: Considering the quality (density) and growth features of the Black pine, this species could be useful for the reforestation of mountainous Southern Europe areas that are not favourable for other species. Numéro de notice : A2018-321 Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s13595-018-0734-6 date de publication en ligne : 08/05/2018 En ligne : https://doi.org/10.1007/s13595-018-0734-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90462 [article]

Evaluation of forest fire on Madeira Island using Sentinel-2A MSI imagery / Gabriel Navarro in International journal of applied Earth observation and geoinformation, vol 58 (June 2017)  

Public [article]  inInternational journal of applied Earth observation and geoinformation > vol 58 (June 2017) . - pp 97 - 106 Titre : Evaluation of forest fire on Madeira Island using Sentinel-2A MSI imagery Type de document : Article/Communication Auteurs : Gabriel Navarro, Auteur ; Isabel Caballero, Auteur ; Gustavo Silva, Auteur ; Pedro-Cecilio Parra, Auteur ; Águeda Vázquez, Auteur ; Rui Caldeira, Auteur Année de publication : 2017 Article en page(s) : pp 97 - 106 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes descripteurs IGN] correction atmosphérique [Termes descripteurs IGN] image Sentinel-MSI [Termes descripteurs IGN] incendie de forêt [Termes descripteurs IGN] indice de végétation [Termes descripteurs IGN] Madère, île de [Termes descripteurs IGN] signature spectrale [Termes descripteurs IGN] surveillance de la végétation Résumé : (auteur) A forest fire started on August 8th, 2016 in several places on Madeira Island causing damage and casualties. As of August 10th the local media had reported the death of three people, over 200 people injured, over 950 habitants evacuated, and 50 houses damaged. This study presents the preliminary results of the assessment of several spectral indices to evaluate the burn severity of Madeira fires during August 2016. These spectral indices were calculated using the new European satellite Sentinel-2A launched in June 2015. The study confirmed the advantages of several spectral indices such as Normalized Difference Vegetation Index (NDVI), Green Normalized Difference Vegetation Index (GNDVI), Normalized Burn Ratio (NBR) and Normalized Difference Vegetation Index (NDVIreXn) using red-edge spectral bands to assess the post-fire conditions. Results showed high correlation between NDVI, GNDVI, NBR and NDVIre1n spectral indices and the analysis performed by Copernicus Emergency Management Service (EMSR175), considered as the reference truth. Regarding the red-edge spectral indices, the NDVIre1n (using band B5, 705 nm) presented better results compared with B6 (740 nm) and B7 (783 nm) bands. These preliminary results allow us to assume that Sentinel-2 will be a valuable tool for post-fire monitoring. In the future, the two twin Sentinel-2 satellites will offer global coverage of the Madeira Archipelago every five days, therefore allowing the simultaneous study of the evolution of the burnt area and reforestation information with high spatial (up to 10 m) and temporal resolution (5 days). Numéro de notice : A2017-366 Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : https://doi.org/10.1016/j.jag.2017.02.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85794 [article]

Analysis of Galileo and GPS integration for GNSS tomography / P. Benevides in IEEE Transactions on geoscience and remote sensing, vol 55 n° 4 (April 2017)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 55 n° 4 (April 2017) . - pp 1936 - 1943 Titre : Analysis of Galileo and GPS integration for GNSS tomography Type de document : Article/Communication Auteurs : P. Benevides, Auteur ; G. Nico, Auteur ; J. Catalão, Auteur Année de publication : 2017 Article en page(s) : pp 1936 - 1943 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes descripteurs IGN] angle azimutal [Termes descripteurs IGN] atmosphère terrestre [Termes descripteurs IGN] données Galileo [Termes descripteurs IGN] humidité de l'air [Termes descripteurs IGN] intégration de données [Termes descripteurs IGN] Lisbonne [Termes descripteurs IGN] reconstruction 3D [Termes descripteurs IGN] réfraction atmosphérique [Termes descripteurs IGN] tomographie par GPS Résumé : (Auteur) Global Navigation Satellite System (GNSS) tomography provides 3-D reconstructions of atmosphere wet refractivity, related to water vapor. A simulated analysis of the integration of Global Positioning System and future Galileo data is presented. Atmospheric refractivity is derived from radiosonde data acquired over the Lisbon area. The impact of Galileo data on the tomographic reconstruction is assessed. Furthermore, horizontal anomalies are added to a reference vertical profile of atmospheric refractivity to reproduce low-level dry or wet air intrusions, a phenomenon commonly observed in meteorological data acquired by both radiosonde and satellites. The dependence of tomographic solution on the GNSS network density is also analyzed. Better reconstruction capabilities in the lower layers are observed when increasing the network density. Numéro de notice : A2017-170 Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern En ligne : http://dx.doi.org/10.1109/TGRS.2016.2631449 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84714 [article]

Natural regeneration of Pinus pinaster and Eucalyptus globulus from plantation into adjacent natural habitats / Patricia Fernandes in Forest ecology and management, vol 378 (15 October 2016)  

Public [article]  inForest ecology and management > vol 378 (15 October 2016) . - pp 91 - 102 Titre : Natural regeneration of Pinus pinaster and Eucalyptus globulus from plantation into adjacent natural habitats Type de document : Article/Communication Auteurs : Patricia Fernandes, Auteur ; Cristina Antunes, Auteur ; Pedro Pinho, Auteur ; et al., Auteur Année de publication : 2016 Article en page(s) : pp 91 - 102 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes descripteurs IGN] Eucalyptus globulus [Termes descripteurs IGN] habitat forestier [Termes descripteurs IGN] Pinus pinaster [Termes descripteurs IGN] Portugal [Termes descripteurs IGN] reboisement [Vedettes matières IGN] Ecologie forestière Résumé : (auteur) The tree species used in planted forests are highly productive and have an important role in countries economy but the expansion of these trees into habitats outside plantations is a concern for managers and conservationists. Among the most planted forest species worldwide, we can find eucalypts and pines species. Understanding spatial patterns and the factors that influence these species colonization is crucial to increase the knowledge about expansion capability of these species and may help managers to improve and prioritize eventual control plans. Our study aimed to identify the recruitment spatial patterns of Pinus pinaster (native species) and Eucalyptus globulus (exotic species) into habitats surrounding plantations in Portugal (native forests, grasslands and shrublands) and to determine the factors that influence recruitment. This was done by looking at the recruitment success in several habitats near plantations, using a spatial gradient of distance to plantations edge. We observed as expected that the recruitment of P. pinaster and E. globulus decreased exponentially from the plantation edge. However, the higher P. pinaster seedling recruitment in this study (P. pinaster: 247 seedlings/ha; E. globulus: 22 seedlings/ha), the smallest decline in seedlings density with distance from plantation boundary (P. pinaster = −0.036 seedlings/m vs E. globulus = −0.048 seedlings/m), and the longer distance of seedling establishment, demonstrate clearly that P. pinaster is more successful colonizing the habitats near plantations than E. globulus. Nevertheless E. globulus can growth seedlings within the planted stands suggesting that the species is becoming naturalized. However, localized recruitment (92% of the total seedlings recorded were located less than 15 m from the plantation edge) and lower levels of establishment of E. globulus from managed plantations, suggested that this species did not demonstrate an invasive behavior. However, future research in abandoned eucalyptus plantation is needed to understand the role of plantation management and age as barriers to E. globulus colonization. Results from our survey revealed the suitability of all habitat types studied for P. pinaster natural regeneration, although their recruitment was more limited in forest habitat type. Forest and grassland were very resistant to E. globulus establishment. The two species recruitment was also influenced by different factors, with P. pinaster being independent of climatic variables, while E. globulus was affected by temperature seasonality and recruitment was found to be higher in areas with lower seasonal differences. Numéro de notice : A2016-699 Thématique : FORET Nature : Article En ligne : http://dx.doi.org/10.1016/j.foreco.2016.07.027 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82067 [article]

Airborne lidar estimation of aboveground forest biomass in the absence of field inventory / António Ferraz in Remote sensing, vol 8 n° 8 (August 2016)    

Public [article]  inRemote sensing > vol 8 n° 8 (August 2016) . - pp 1 - 18 Titre : Airborne lidar estimation of aboveground forest biomass in the absence of field inventory Type de document : Article/Communication Auteurs : António Ferraz , Auteur ; Sassan Saatchi, Auteur ; Clément Mallet , Auteur ; Stéphane Jacquemoud, Auteur ; Gil Rito Gonçalves, Auteur ; Carlos Alberto Silva, Auteur ; Paula Soares, Auteur ; Margarida Tomé, Auteur ; Luisa Pereira, Auteur Année de publication : 2016 Article en page(s) : pp 1 - 18 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes descripteurs IGN] allométrie [Termes descripteurs IGN] analyse de groupement [Termes descripteurs IGN] biomasse aérienne [Termes descripteurs IGN] biomasse forestière [Termes descripteurs IGN] classification automatique d'objets [Termes descripteurs IGN] couvert végétal [Termes descripteurs IGN] dendrométrie [Termes descripteurs IGN] données lidar [Termes descripteurs IGN] extraction d'arbres [Termes descripteurs IGN] fiabilité des données [Termes descripteurs IGN] houppier [Termes descripteurs IGN] Portugal [Termes descripteurs IGN] puits de carbone [Termes descripteurs IGN] semis de points [Termes descripteurs IGN] structure d'un peuplement forestier Résumé : (Auteur) The scientific community involved in the UN-REDD program is still reporting large uncertainties about the amount and spatial variability of CO2 stored in forests. The main limitation has been the lack of field samplings over space and time needed to calibrate and convert remote sensing measurements into aboveground biomass (AGB). As an alternative to costly field inventories, we examine the reliability of state-of-the-art lidar methods to provide direct retrieval of many forest metrics that are commonly collected through field sampling techniques (e.g., tree density, individual tree height, crown cover). AGB is estimated using existing allometric equations that are fed by lidar-derived metrics at either the individual tree- or forest layer-level (for the overstory or underneath layers, respectively). Results over 40 plots of a multilayered forest located in northwest Portugal show that the lidar method provides AGB estimates with a relatively small random error (RMSE = of 17.1%) and bias (of 4.6%). It provides local AGB baselines that meet the requirements in terms of accuracy to calibrate satellite remote sensing measurements (e.g., the upcoming lidar GEDI (Global Ecosystem Dynamics Investigation), and the Synthetic Aperture Radar (SAR) missions NISAR (National Aeronautics and Space Administration and Indian Space Research Organization SAR) and BIOMASS from the European Space Agency, ESA) for AGB mapping purposes. The development of similar techniques over a variety of forest types would be a significant improvement in quantifying CO2 stocks and changes to comply with the UN-REDD policies. Numéro de notice : A2016--104 Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.3390/rs8080653 date de publication en ligne : 12/08/2016 En ligne : https://doi.org/10.3390/rs8080653 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=84675 [article]

Documents numériques

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Canopy density model: A new ALS-derived product to generate multilayer crown cover maps / António Ferraz in IEEE Transactions on geoscience and remote sensing, vol 53 n° 12 (December 2015)  

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Tree rings reflect growth adjustments and enhanced synchrony among sites in Iberian stone pine (Pinus pinea L.) under climate change / Fabio Natalini in Annals of Forest Science [en ligne], vol 72 n° 8 (December 2015)  

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How large was the Earth in the sixteenth century? The length of the degree of latitude in the Iberian cartography of the Renaissance / Joaquim Alves Gaspar in Cartographic journal (the), Vol 52 n° 4 (November 2015)

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UAV photogrammetry for topographic monitoring of coastal areas / J.A. Gonçalves in ISPRS Journal of photogrammetry and remote sensing, vol 104 (June 2015)  

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Combined adjustment of angle and distance measurements in a dam monitoring network / J. Casaca in Survey review, vol 47 n° 342 (May 2015)  

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Biomass estimation with high resolution satellite images: A case study of Quercus rotundifolia / Adelia M.O. Sousa in ISPRS Journal of photogrammetry and remote sensing, vol 101 (March 2015)  

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Experimental study on the atmospheric delay based on GPS, SAR Interferometry, and numerical weather model data / P. Mateus in IEEE Transactions on geoscience and remote sensing, vol 51 n° 1 Tome 1 (January 2013)  

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Land-use change in Portugal, 1990-2006: Main processes and underlying factors / V. Diogo in Cartographica, vol 47 n° 4 (December 2012)  

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3-D mapping of a multi-layered Mediterranean forest using ALS data / António Ferraz in Remote sensing of environment, vol 121 (June 2012)  

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Le portail MAIA, un espace collaboratif cartographique / A. Eynaudi in Géomatique expert, n° 84 (01/01/2012)

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