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Automatic stem mapping using single-scan terrestrial laser scanning / X. Liang in IEEE Transactions on geoscience and remote sensing, vol 50 n° 2 (February 2012)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 50 n° 2 (February 2012) . - pp 661 - 670 Titre : Automatic stem mapping using single-scan terrestrial laser scanning Type de document : Article/Communication Auteurs : X. Liang, Auteur ; P. Litkey, Auteur ; Juha Hyyppä, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : pp 661 - 670 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] Finlande [Termes IGN] forêt [Termes IGN] Pinophyta [Termes IGN] télémétrie laser terrestre [Termes IGN] tronc Résumé : (Auteur) The demand for detailed ground reference data in quantitative forest inventories is growing rapidly, e.g., to improve the calibration of the developed models of airborne-laser-scanning-based inventories. The application of terrestrial laser scanning (TLS) in the forest has shown great potential for improving the accuracy and efficiency of field data collection. This paper presents a fully automatic stem-mapping algorithm using single-scan TLS data for collecting individual tree information from forest plots. In this method, the stem points are identified by the spatial distribution properties of the laser points, the stem model is built up of a series of cylinders, and the location of the stem is estimated by the model. The experiment was performed on nine plots with 10-m radius. The stem-location maps measured in the field by traditional methods were used as the ground truth. The overall stem-mapping accuracy was 73%. The result shows that, in a relatively dense managed forest, the majority of stems can be located by the automatic algorithm. The proposed method is a general solution for stem locating where particular plot knowledge and data format are not required. Numéro de notice : A2012-050 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2011.2161613 Date de publication en ligne : 18/08/2011 En ligne : https://doi.org/10.1109/TGRS.2011.2161613 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31498 [article]

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A test of 2D building change detection methods : comparison, evaluation and perspectives / Nicolas Champion (2008)  

Public Titre : A test of 2D building change detection methods : comparison, evaluation and perspectives Type de document : Article/Communication Auteurs : Nicolas Champion , Auteur ; Leena Matikainen, Auteur ; Franz Rottensteiner, Auteur ; X. Liang, Auteur ; Juha Hyyppä, Auteur Editeur : International Society for Photogrammetry and Remote Sensing ISPRS Année de publication : 2008 Collection : International Archives of Photogrammetry, Remote Sensing and Spatial Information Sciences, ISSN 1682-1750 num. 37-B4 Conférence : ISPRS 2008, 21st ISPRS world congress 03/07/2008 11/07/2008 Pékin Chine OA ISPRS Archives Importance : pp 297 - 304 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] analyse comparative [Termes IGN] bati [Termes IGN] détection de changement [Termes IGN] données localisées 2D [Termes IGN] image numérique [Termes IGN] mesure de la qualité Résumé : (Auteur) In the past few years, 2D topographic databases have been completed in most industrialised countries. Most efforts in National Mapping and Cadastral Agencies (NMCAs) are now devoted to the update of such databases. Because it is generally carried out manually, by visual inspection of orthophotos, the updating process is time-consuming and expensive. The development of semiautomatic systems is thus of high interest for NMCAs. The obvious lack of expertise in the domain has driven EuroSDR to set up a test comparing different change detection approaches. In this paper, we limit the scope of the project to the imagery context. After describing input data, we shortly introduce the approaches of the working groups that have already submitted results. Preliminary results are assessed and a discussion enables to bring out first conclusions and directions. Numéro de notice : C2008-027 Affiliation des auteurs : MATIS+Ext (1993-2011) Thématique : IMAGERIE Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVII/congress/4_pdf/53.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64214