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Large off-nadir scan angle of airborne LiDAR can severely affect the estimates of forest structure metrics / Jing Liu in ISPRS Journal of photogrammetry and remote sensing, vol 136 (February 2018)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 136 (February 2018) . - pp 13 - 25 Titre : Large off-nadir scan angle of airborne LiDAR can severely affect the estimates of forest structure metrics Type de document : Article/Communication Auteurs : Jing Liu, Auteur ; Andrew K. Skidmore, Auteur ; Simon D. Jones, Auteur ; Tiejun Wang, Auteur ; Marco Heurich, Auteur ; Xi Zhu, Auteur ; Yifang Shi, Auteur Année de publication : 2018 Article en page(s) : pp 13 - 25 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] angle de visée [Termes IGN] Bavière (Allemagne) [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] instrument aéroporté [Termes IGN] parc naturel régional [Termes IGN] placette d'échantillonnage [Termes IGN] structure d'un peuplement forestier Résumé : (Auteur) Gap fraction (Pgap) and vertical gap fraction profile (vertical Pgap profile) are important forest structural metrics. Accurate estimation of Pgap and vertical Pgap profile is therefore critical for many ecological applications, including leaf area index (LAI) mapping, LAI profile estimation and wildlife habitat modelling. Although many studies estimated Pgap and vertical Pgap profile from airborne LiDAR data, the scan angle was often overlooked and a nadir view assumed. However, the scan angle can be off-nadir and highly variable in the same flight strip or across different flight strips. In this research, the impact of off-nadir scan angle on Pgap and vertical Pgap profile was evaluated, for several forest types. Airborne LiDAR data from nadir (0°∼7°), small off-nadir (7°∼23°), and large off-nadir (23°∼38°) directions were used to calculate both Pgap and vertical Pgap profile. Digital hemispherical photographs (DHP) acquired during fieldwork were used as references for validation. Our results show that angular Pgap from airborne LiDAR correlates well with angular Pgap from DHP (R2 = 0.74, 0.87, and 0.67 for nadir, small off-nadir and large off-nadir direction). But underestimation of Pgap from LiDAR amplifies at large off-nadir scan angle. By comparing Pgap and vertical Pgap profiles retrieved from different directions, it is shown that scan angle impact on Pgap and vertical Pgap profile differs amongst different forest types. The difference is likely to be caused by different leaf angle distribution and canopy architecture in these forest types. Statistical results demonstrate that the scan angle impact is more severe for plots with discontinuous or sparse canopies. These include coniferous plots, and deciduous or mixed plots with between-crown gaps. In these discontinuous plots, Pgap and vertical Pgap profiles are maximum when observed from nadir direction, and then rapidly decrease with increasing scan angle. The results of this research have many important practical implications. First, it is suggested that large off-nadir scan angle of airborne LiDAR should be avoided to ensure a more accurate Pgap and LAI estimation. Second, the angular dependence of vertical Pgap profiles observed from airborne LiDAR should be accounted for, in order to improve the retrieval of LAI profiles, and other quantitative canopy structural metrics. This is especially necessary when using multi-temporal datasets in discontinuous forest types. Third, the anisotropy of Pgap and vertical Pgap profile observed by airborne LiDAR, can potentially help to resolve the anisotropic behavior of canopy reflectance, and refine the inversion of biophysical and biochemical properties from passive multispectral or hyperspectral data Numéro de notice : A2018-072 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2017.12.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2017.12.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89432 [article]

Exemplaires(3)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2018021	RAB	Revue	Centre de documentation	En réserve L003	Disponible
081-2018023	RAB	Revue	Centre de documentation	En réserve L003	Disponible
081-2018022	DEP-EAF	Revue	Nancy	Dépôt en unité	Exclu du prêt

Overview and current status of remote sensing applications based on unmanned aerial vehicles (UAVs) / Gonzalo Pajares in Photogrammetric Engineering & Remote Sensing, PERS, vol 81 n° 4 (April 2015)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 81 n° 4 (April 2015) . - pp 281- 330 Titre : Overview and current status of remote sensing applications based on unmanned aerial vehicles (UAVs) Type de document : Article/Communication Auteurs : Gonzalo Pajares, Auteur Année de publication : 2015 Article en page(s) : pp 281- 330 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de télédétection [Termes IGN] acquisition d'images [Termes IGN] capteur aérien [Termes IGN] drone [Termes IGN] instrument aéroporté [Termes IGN] télédétection aérienne Résumé : (auteur) Remotely Piloted Aircraft (RPA) is presently in continuous development at a rapid pace. Unmanned Aerial Vehicles (UAVs) or more extensively Unmanned Aerial Systems (UAS) are platforms considered under the RPAs paradigm. Simultaneously, the development of sensors and instruments to be installed onboard such platforms is growing exponentially. These two factors together have led to the increasing use of these platforms and sensors for remote sensing applications with new potential. Thus, the overall goal of this paper is to provide a panoramic overview about the current status of remote sensing applications based on unmanned aerial platforms equipped with a set of specific sensors and instruments. First, some examples of typical platforms used in remote sensing are provided. Second, a description of sensors and technologies is explored which are onboard instruments specifically intended to capture data for remote sensing applications. Third, multi-UAVs in collaboration, coordination, and cooperation in remote sensing are considered. Finally, a collection of applications in several areas are proposed, where the combination of unmanned platforms and sensors, together with methods, algorithms, and procedures provide the overview in very different remote sensing applications. This paper presents an overview of different areas, each independent from the others, so that the reader does not need to read the full paper when a specific application is of interest. Numéro de notice : A2015-964 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.81.4.281 En ligne : https://doi.org/10.14358/PERS.81.4.281 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80022 [article]

A new planar electrostatic gravity gradiometer for airborne surveys / Karim Douch (2013)  

Public Titre : A new planar electrostatic gravity gradiometer for airborne surveys Type de document : Article/Communication Auteurs : Karim Douch , Auteur ; Bernard Foulon, Auteur ; Bruno Christophe, Auteur ; Michel Diament , Auteur ; Gwendoline Pajot-Métivier , Auteur ; Isabelle Panet , Auteur Editeur : Tulsa [Oklahoma - Etats-Unis] : Society of Exploration Geophysicists SEG Année de publication : 2013 Conférence : SEG 2013, Society of Exploration Geophysicists International Exposition and 83rd Annual Meeting, Expanding Geophysical Frontiers 22/09/2013 27/09/2013 Houston Texas - Etats-Unis Proceedings Curran Associates Importance : pp 1216 - 1219 Note générale : in SEG Technical Program Expanded Abstracts 2013 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] gradiomètre [Termes IGN] gravimètre [Termes IGN] gravimétrie aérienne [Termes IGN] instrument aéroporté [Termes IGN] instrument de géodésie Résumé : (auteur) Compared to classical gravimetric surveys, the measurement of the spatial rates of the gravitational acceleration offers an improved insight on the distribution and geometry of the subsurface causative masses. Though, there is only one commercialized gradiometer system currently available on the market. The purpose of our project is thus to develop a new compact gravity gradiometer based on electrostatic accelerometers, for airborne or ship-borne surveys. These accelerometers inherit from technologies developed by ONERA for spatial missions like GRACE or GOCE. The principle of measurement is described along with a first assessment of its performance in real airborne conditions. The goal is to reach the critical precision of 1Eötvös corresponding to a sensitivity to variations of 0.1μGal/m. Numéro de notice : C2013-021 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Autre URL associée : lien DOI Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1190/segam2013-1122.1 En ligne : https://www.researchgate.net/profile/Bruno-Christophe/publication/269042781_A_ne [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97261

The SETHI remote sensing airborne platform and the related science activities / Pascal Fernandez in Revue Française de Photogrammétrie et de Télédétection, n° 200 (Novembre 2012)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 200 (Novembre 2012) . - pp 36 - 47 Titre : The SETHI remote sensing airborne platform and the related science activities Type de document : Article/Communication Auteurs : Pascal Fernandez, Auteur ; O. Ruault Du Duplessis, Auteur ; A. Arnaubec, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 36 - 47 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] bande P [Termes IGN] bande X [Termes IGN] biomasse [Termes IGN] biomasse (combustible) [Termes IGN] instrument aéroporté [Termes IGN] radar à antenne synthétique [Termes IGN] visée oblique [Termes IGN] visée verticale Résumé : (Auteur) ONERA, the French Aerospace Lab, has been designing airborne radar for more than two decades for Defence oriented applications, as well as for science applications. In the past six years, the SETHI instrument, hosted on board a Falcon 20 aircraft, has been developed with a main focus on science applications. In this paper, the philosophy of this development is highlighted together with a detailed description of the instruments. The SETHI instrument includes three SAR systems at P, L and X bands, one context camera in the visible domain, with a side looking geometry matching the radar field of view, and a hyperspectral camera with standard nadir geometry. The paper then summarises the latest SETHI campaigns in the context of two spaceborne mission preparations. The first is the ESA BIOMASS mission with a P-Band SAR instrument for global forest biomass mapping. The second one is a maritime surveillance mission, including an X-band SAR system. For each campaign, the main objectives are listed, the references to the dedicated papers are provided and the major results are highlighted. Finally the paper then provides a preview for the future developments around the SETHI system, for studies dedicated to the optical/radar data fusion. Numéro de notice : A2012-566 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.52638/rfpt.2012.60 Date de publication en ligne : 19/04/2014 En ligne : https://doi.org/10.52638/rfpt.2012.60 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32012 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
018-2012041	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Potential of an ultraviolet, medium-footprint lidar prototype for retrieving forest structure / Tristan Allouis in ISPRS Journal of photogrammetry and remote sensing, vol 66 n° 6 supplement (December 2011)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 66 n° 6 supplement (December 2011) . - pp 92 - 102 Titre : Potential of an ultraviolet, medium-footprint lidar prototype for retrieving forest structure Type de document : Article/Communication Auteurs : Tristan Allouis, Auteur ; Sylvie Durrieu, Auteur ; Patrick Chazette, Auteur ; J. Bailly, Auteur ; et al., Auteur ; Cédric Vega , Auteur Année de publication : 2011 Article en page(s) : pp 92 - 102 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] Aquitaine [Termes IGN] atténuation du signal [Termes IGN] correction du signal [Termes IGN] données lidar [Termes IGN] empreinte [Termes IGN] forêt tempérée [Termes IGN] géostatistique [Termes IGN] hauteur des arbres [Termes IGN] instrument aéroporté [Termes IGN] Landes (40) [Termes IGN] Pinophyta [Termes IGN] rayonnement ultraviolet [Termes IGN] surveillance forestière Résumé : (Auteur) The aim of the paper is to carry on methodological development for retrieving forest parameters from medium-footprint lidar signals and for assessing the performance of different sampling strategies. The 2.4 m footprint lidar prototype (a profiler instrument using an ultraviolet laser) was flown above two different maritime pine stands: a young plantation (10 years old) and a mature, semi-natural stand (55 years old), both in the Landes forest, France. The vertical distribution of lidar measurements was studied for retrieving forest height parameters (mean total height, mean crown height and top height). The processing algorithm was based on an aggregation of successive signals followed by the correction of the signal attenuation along the travel through the vegetation. The performance of different sampling strategies was assessed by comparing the results for the full dataset (several fight lines over the stands) and for only a data subset (one flight line). In addition, the horizontal distribution of height measurements was studied for identifying the planting pattern of the stands and assessing the tree spacing of the semi-natural parcel, using geostatistics. We obtained a submetric estimation error (lidar – reference) of 0.2 m on the mean total height in the young stand (-0.7 m in the mature stand), a bias of -0.3 m (-0.3 m) on the mean crown height measurement and of 0.6 m (-1.0 m) on the top height. The planting pattern was also successfully identified, and the distance between trees was assessed in agreement with ground measurements. Having demonstrated its ability to assess forest structure, even with a unique flight line, the lidar prototype seems to be a valuable sensor for performing fast forest inventory at regional scale. In addition, this sensor opens the way to the development of bi-functional lidar for both atmosphere and vegetation remote sensing. Numéro de notice : A2011-522 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2011.08.007 En ligne : https://doi.org/10.1016/j.isprsjprs.2011.08.007 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31416 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2011071	SL	Revue	Centre de documentation	Revues en salle	Disponible

Flying the Ultracam XP [in Great Britain] / Mark Tabor in GEO: Geoconnexion international, vol 10 n° 9 (october 2011)

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Digital aerial cameras / Mathias Lemmens in GIM international, vol 25 n° 4 (April 2011)  

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Registration quality - towards integration of laser scanning and photogrammetry / Petri Rönnholm (2011)    

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Ten years of technology advancement in remote sensing and the research in the CRC-AGIP in GCE / Y. Zhang in Geomatica, vol 64 n° 2 (June 2010)  

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La canopée forestière vue par un Lidar ultra-violet aéroporté de nouvelle génération / J. Cuesta in Revue Française de Photogrammétrie et de Télédétection, n° 191 (Mai 2010)  

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Commission 1: Performance of medium format digital airborne cameras / Görres Grenzdorffer (2010) 

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EuroSDR-Project / Jantien E. Stoter (2010)    

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From imagery to map: digital photogrammetric technologies, a report to the Greece 2009 conference / Gordon Petrie in Geoinformatics, vol 12 n° 8 (01/12/2009)

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The design and the development of a hyperspectral and multispectral airborne mapping system / P.V. Gorsevski in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 2 (March - April 2009)  

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Fighting wildfires with GPS in Portugal / E. Van Rees in Geoinformatics, vol 11 n° 7 (01/11/2008)

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