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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)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 53 n° 12 (December 2015) . - pp 6776 - 6790 Titre : Canopy density model: A new ALS-derived product to generate multilayer crown cover maps Type de document : Article/Communication Auteurs : António Ferraz , Auteur ; Clément Mallet , Auteur ; Stéphane Jacquemoud, Auteur ; Gil Rito-Gonçalves , Auteur ; Margarida Tomé, Auteur ; Paola Soares, Auteur ; Luisa M. Gomes Pereira, Auteur ; Frédéric Bretar, Auteur Année de publication : 2015 Article en page(s) : pp 6776 - 6790 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] canopée [Termes IGN] carte de la végétation [Termes IGN] données de terrain [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] estimation par noyau [Termes IGN] Portugal [Termes IGN] sous-étage [Termes IGN] structure d'un peuplement forestier [Termes IGN] traitement d'image Résumé : (auteur) The canopy density model (CDM), a new product interpolated from airborne laser scanner (ALS) data and dedicated to forest structure characterization is presented. It exploits both the multiecho capability of the ALS and a nonparametric density estimation technique called kernel density estimators (KDEs). The CDM is used to delineate the outmost perimeter of vegetation features and to compute forest crown cover (CrCO). Contrary to other works that focus on single-layer forest canopies, CrCo is derived here for each layer, namely, the overstory, the understory, and ground vegetation. The root-mean-square error of prediction determined by using field data acquired over 44 forest stands in a forest in Portugal allows the testing of the reliability of the method: It ranges from 6.21% (overstory) to 13.76% (ground vegetation). In addition, we investigate the ability of the CDM to map the CrCo for individual trees. Finally, two existing methods have been applied to our study site in order to assess improvements, advantages, and drawbacks of our approach. Numéro de notice : A2015-840 Affiliation des auteurs : LASTIG MATIS+Ext (2012-2019) Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2015.2448056 Date de publication en ligne : 10/08/2015 En ligne : http://dx.doi.org/10.1109/TGRS.2015.2448056 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=79180 [article]

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Suitability of laser for DTM generation: a case study in the context of road planning and design / Luisa M. Gomes Pereira in ISPRS Journal of photogrammetry and remote sensing, vol 54 n° 4 (September - November 1999)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 54 n° 4 (September - November 1999) . - pp 244 - 253 Titre : Suitability of laser for DTM generation: a case study in the context of road planning and design Type de document : Article/Communication Auteurs : Luisa M. Gomes Pereira, Auteur ; L.L. Janssen, Auteur Année de publication : 1999 Article en page(s) : pp 244 - 253 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Photogrammétrie terrestre [Termes IGN] données laser [Termes IGN] fusion de données [Termes IGN] lasergrammétrie [Termes IGN] modèle numérique de terrain [Termes IGN] Pays-Bas [Termes IGN] relief [Termes IGN] réseau routier [Termes IGN] télémétrie laser aéroporté Résumé : (Auteur) Laser range data acquired from a helicopter are evaluated in terms of the information that can be derived from them and the accuracy. The objective is to study the suitability of laser data to generate a DSM for road planning and design in the Netherlands. The conclusion is that high-density laser measurements allow the reconstruction of the terrain relief with the required accuracy. Nonetheless, they do not allow the extraction of all the information required, particulary semantic information. Thus, the combination of laser data with existing geographic information is a prerequisite. This process of combining laser data with existing geographic information is not trivial. The rate of success depends much on the quality of the individual data sets and the method used to combine them. This problem appears in a much broader context, that of spatial data fusion, and should be object of future research. Copyright ISPRS Numéro de notice : A1999-189 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(99)00018-0 En ligne : https://doi.org/10.1016/S0924-2716(99)00018-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26386 [article]

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Errors and accuracy estimates of laser data acquired by various laser scanning systems for topographic applications / E.J. Huising in ISPRS Journal of photogrammetry and remote sensing, vol 53 n° 5 (September - October 1998)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 53 n° 5 (September - October 1998) . - pp 245 - 261 Titre : Errors and accuracy estimates of laser data acquired by various laser scanning systems for topographic applications Type de document : Article/Communication Auteurs : E.J. Huising, Auteur ; Luisa M. Gomes Pereira, Auteur Année de publication : 1998 Article en page(s) : pp 245 - 261 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Topographie [Termes IGN] données laser [Termes IGN] écart type [Termes IGN] erreur systématique [Termes IGN] précision du positionnement [Termes IGN] télémétrie laser aéroporté Résumé : (Auteur) The Survey Department of Rijkswaterstaat in The Netherlands makes extensive use of laser scanning for topographic measurements. An inventory of sources of errors indicates that errors may vary from 5 to 200 cm. The experience shows that errors related to the laser instrument, GPS and INS may frequently occur, resulting in local distortions, and planimetric and height shifts. Moreover, the results indicate that for flat terrain, having corrected for gross errors, an offset of less than 10 cm can often be obtained and standard deviations are generally well within 15 cm. For hilly and flat terrain densely covered by vegetation, accuracy estimates do not generally fulfil those required by Rijkswaterstaat. However, the use of an adequate strategy for data collection and processing will, to a great extent, improve the accuracy and fidelity of the results. Thus, research should be devoted to the design of appropriate strategies for data collection and processing. Copyright ISPRS Numéro de notice : A1998-194 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/S0924-2716(98)00013-6 En ligne : https://doi.org/10.1016/S0924-2716(98)00013-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26160 [article]

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