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The application of short-range 3D laser scanning for archaeological replica production: the Egyptian tomb of Seti 1 / J. Ahmon in Photogrammetric record, vol 19 n° 106 (June - August 2004)
[article]
Titre : The application of short-range 3D laser scanning for archaeological replica production: the Egyptian tomb of Seti 1 Type de document : Article/Communication Auteurs : J. Ahmon, Auteur Année de publication : 2004 Article en page(s) : pp 111 - 127 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] archéométrie
[Termes IGN] données laser
[Termes IGN] données localisées 3D
[Termes IGN] Egypte
[Termes IGN] image à très haute résolution
[Termes IGN] lasergrammétrie
[Termes IGN] patrimoine archéologique
[Termes IGN] photogrammétrie numérique
[Termes IGN] photographie numérique
[Termes IGN] télémètre laser terrestre
[Termes IGN] télémétrie laser terrestre
[Termes IGN] tombeRésumé : (Auteur) Le levé Laser 3D haute-résolution, combiné à des techniques issues de la production industrielle, peut être utilisé pour fabriquer des répliques fidèles dans le domaine du patrimoine. Si les copies ont la réputation d'être inférieures à l'original, le fait d'utiliser des technologies numériques apporte cependant des résultats convaincants avec des résolutions de l'ordre de la fraction de millimètre. Des répliques des grottes de Lascaux ou d'Altamira ont déjà été utilisées pour aider à la préservation des sites originaux, en les mettant à l'abri des risques liés au grand nombre de visiteurs. Le même principe est aujourd'hui appliqué à la tombe de Seti I, dans la vallée des rois, en Egypte. Un projet pilote a été mené pour produire une copie grandeur nature de 16 mètres carrés de section de la chambre funéraire. Le but était d'utiliser le levé Laser et la photogrammétrie numérique pour décrire la chambre avec la meilleure résolution possible et de proposer en sortie un relief tri-dimensionnel obtenu grâce à des techniques industrielles. In fine, ce relief a pu être imprimé en couleur. Cet article décrit la fabrication de la copie, avec notamment une description du scanneur Seti, le système d'acquisition Laser spécialement conçu pour ce projet. Numéro de notice : A2004-216 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2004.00034.x En ligne : https://doi.org/10.1111/j.1477-9730.2004.00034.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26743
in Photogrammetric record > vol 19 n° 106 (June - August 2004) . - pp 111 - 127[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 106-04021 RAB Revue Centre de documentation En réserve L003 Disponible Small-footprint lidar estimation of sub-canopy elevation and tree height in a tropical rain forest landscape / M.L. Clarke in Remote sensing of environment, vol 91 n° 1 (15/05/2004)
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Titre : Small-footprint lidar estimation of sub-canopy elevation and tree height in a tropical rain forest landscape Type de document : Article/Communication Auteurs : M.L. Clarke, Auteur ; D. Clark, Auteur ; D.A. Roberts, Auteur Année de publication : 2004 Article en page(s) : pp 68 - 89 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] corrélation linéaire
[Termes IGN] données lidar
[Termes IGN] erreur moyenne quadratique
[Termes IGN] forêt tropicale
[Termes IGN] interpolation inversement proportionnelle à la distance
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] sous-bois
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Meso-scale digital terrain models (DTMs) and canopy-height estimates, or digital canopy models (DCMs), are two lidar products that have immense potential for research in tropical rain forest (TRF) ecology and management. In this study, we used a small-footprint lidar sensor (airborne laser scanner, ALS) to estimate sub-canopy elevation and canopy height in an evergreen tropical rain forest. A fully automated, local-minima algorithm was developed to separate lidar ground returns from overlying vegetation returns. We then assessed inverse distance weighted (IDW) and ordinary kriging (OK) geostatistical techniques for the interpolation of a sub-canopy DTM. OK was determined to be a superior interpolation scheme because it smoothed fine-scale variance created by spurious understory heights in the ground-point dataset. The final DTM had a linear correlation of 1.00 and a root-mean-square error (RMSE) of 2.29 m when compared against 3859 well-distributed ground-survey points. In old-growth forests, RMS error on steep slopes was 0.67 m greater than on flat slopes. On flatter slopes, variation in vegetation complexity associated with land use caused highly significant differences in DTM error distribution across the landscape. The highest DTM accuracy observed in this study was 0.58-m RMSE, under flat, open-canopy areas with relatively smooth surfaces. Lidar ground retrieval was complicated by dense, multi-layered evergreen canopy in old-growth forests, causing DTM overestimation that increased RMS error to 1.95 m.
A DCM was calculated from the original lidar surface and the interpolated DTM. Individual and plot-scale heights were estimated from DCM metrics and compared to field data measured using similar spatial supports and metrics. For old-growth forest emergent trees and isolated pasture trees greater than 20 in tall, individual tree heights were underestimated and had 3.67- and 2.33-m mean absolute error (MAE), respectively. Linear-regression models explained 51% (4.15-m RMSE) and 95% (2.41-m RMSE) of the variance, respectively. It was determined that improved elevation and field-height estimation in pastures explained why individual pasture trees could be estimated more accurately than old-growth trees. Mean height of tree stems in 32 young agroforestry plantation plots (0.38 to 18.53 m tall) was estimated with a mean absolute error of 0.90 m (r 2 = 0,97; 1.08-m model RMSE) using the mean of lidar returns in the plot. As in other small-footprint lidar studies, plot mean height was underestimated; however, our plot-scale results have stronger linear models for tropical, leaf-on hardwood trees than has been previously reported for temperate-zone conifer and deciduous hardwoods.Numéro de notice : A2004-237 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.02.008 En ligne : https://doi.org/10.1016/j.rse.2004.02.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26764
in Remote sensing of environment > vol 91 n° 1 (15/05/2004) . - pp 68 - 89[article]Estimation of timber volume and stem density based on scanning laser altimetry and expected tree size distribution functions / Matti Maltamo in Remote sensing of environment, vol 90 n° 3 (15/04/2004)
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Titre : Estimation of timber volume and stem density based on scanning laser altimetry and expected tree size distribution functions Type de document : Article/Communication Auteurs : Matti Maltamo, Auteur ; Kalle Eerikäinen, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 319 - 330 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] couvert forestier
[Termes IGN] Finlande
[Termes IGN] forêt
[Termes IGN] hauteur des arbres
[Termes IGN] houppier
[Termes IGN] inventaire forestier (techniques et méthodes)
[Termes IGN] mesure de précision
[Termes IGN] Pinophyta
[Termes IGN] sylviculture
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] troncRésumé : (Auteur) Laser scanners of small footprint diameter and high sampling density provide possibility to obtain accurate height information on the forest canopy. When applying tree crown segmentation methods, individual single trees can be recognised and tree height as well as crown area can be detected. Detection of suppressed trees from a height model based on laser scanning is difficult; however, it is possible to predict these trees by using theoretical distribution functions. In this study, two different methods are used to predict small trees. In the first method, the parameter prediction method is utilised with the complete Weibull distribution, the parameters of which are predicted with separate parameter prediction models; thus, small trees are determined from the predicted tree height distribution. In the second method, the twoparameter left-truncated Weibull distribution is fitted to the detected tree height distribution.
The results are presented by using timber volume and stem density as predicted stand characteristics. The results showed that the root mean square error (RMSE) for the timber volume is about 25% when using only information obtained from laser scanning, whereas the RMSE for the number of stems per ha is about 75%. Predictions for both characteristics are also highly biased and the underestimates are 24% and 62%, respectively. The use of the parameter prediction method to describe small trees improved the accuracy considerably; the RMSE figures for estimates of timber volume and number of stems are 16.0% and 49.2%, respectively. The bias for the estimates is also decreased to 6.3% for timber volume and 8.2% for the number of stems. When a left-truncated height distribution is used to predict the heights of the missing small trees, the RMSEs for the estimates of timber volume and number of stems are 22.5% and 72.7%, respectively. In the case of the timber volume, the reliability figures for both the original laser scanning-based estimates and for the estimates that also contain small trees are comparable to those obtained by conventional compartment-wise Finnish field inventories.Numéro de notice : A2004-199 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2004.01.006 En ligne : https://doi.org/10.1016/j.rse.2004.01.006 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26726
in Remote sensing of environment > vol 90 n° 3 (15/04/2004) . - pp 319 - 330[article]From mobile mapping to telegeoinformatics: paradigm shift in geospatial data acquisition, processing, and management / Dorota A. Grejner-Brzezinska in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 2 (February 2004)
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Titre : From mobile mapping to telegeoinformatics: paradigm shift in geospatial data acquisition, processing, and management Type de document : Article/Communication Auteurs : Dorota A. Grejner-Brzezinska, Auteur ; R. Li, Auteur ; et al., Auteur Année de publication : 2004 Article en page(s) : pp 197 - 210 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] capteur imageur
[Termes IGN] capteur multibande
[Termes IGN] chambre DTC
[Termes IGN] données lidar
[Termes IGN] géoréférencement direct
[Termes IGN] GPS-INS
[Termes IGN] image multibande
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] reconnaissance automatique
[Termes IGN] reconnaissance d'objets
[Termes IGN] SIG nomade
[Termes IGN] système de numérisation mobile
[Termes IGN] télécommunication sans fil
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] télémétrie laser terrestre
[Termes IGN] temps réelRésumé : (Auteur) Technological advances in positioning and imaging sensors, combined with the explosion in wireless mobile communication systems that occurred during the lost decade of the twentieth century, practically redefined and substantially extended the concept of mobile mapping. The advent of the first mobile mapping systems (MMS) in the early 1990s initiated the process of establishing modern, virtually ground-control-free photogrammetry and digital mapping. By the end of the last decade, mobile mapping technology had made remarkable progress, evolving from rather simple land-based systems to more sophisticated, real-time multitasking and multisensor systems, operational in land and airborne environments. New specialized systems, based on modern imaging sensors, such as CCD (charge-coupled device) cameras, lidar (Light Detection and Ranging) and hyperspectral/multispectral scanners, are being developed, aimed at automatic data acquisition for geoinformatics, thematic mapping, land classification, terrain modeling, emergency response, homeland security, etc. This paper provides an overview of the mobile mapping concept, with a special emphasis on the MMS paradigm shift from the post-mission to near-real-time systems that occurred in the past few years. A short review of the direct georeferencing concept is given, and the major techniques (sensors) used for platform georegistration, as well as the primary radiolocation techniques based on wireless networks, are presented. An overview of the major imaging sensors and the importance of multisensor system calibration are also provided. Future perspectives of mobile mapping and its extension towards telegeoinformatics are also discussed. Some examples of mobile geospatial technology used in automatic object recognition, real-time highway centerline mapping, thematic mapping, and city modeling with lidar and multispectral imagery are included. Copyright ASPRS Numéro de notice : A2004-067 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.14358/PERS.70.2.197 En ligne : http://dx.doi.org/10.14358/PERS.70.2.197 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26595
in Photogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 2 (February 2004) . - pp 197 - 210[article]Laserscan DTMS for modeling flood risk areas / Karl Kraus in GIS Geo-Informations-Systeme, vol 2003 n° 12 (Dezember 2003)
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Titre : Laserscan DTMS for modeling flood risk areas Type de document : Article/Communication Auteurs : Karl Kraus, Auteur Année de publication : 2003 Article en page(s) : pp 26 - 32 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données laser
[Termes IGN] géomorphologie
[Termes IGN] géoréférencement direct
[Termes IGN] GPS-INS
[Termes IGN] inondation
[Termes IGN] lasergrammétrie
[Termes IGN] modèle numérique de terrain
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] risque naturel
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Applying DTMs derived from laser scanner data yields major advantages for modeling flood risk areas. To meet the exceptionally high accuracy requirements as stated by hydrologists, careful application of advanced DTM technology is inevitable. Below, the following points are addressed : 1- Georeferencing airborne laser scanner data, 2- Interpolation of DTMs taking into consideration break line information semi automatically extracted from the laser scanner data by means of mathematical snake curves, 3- Deriving models of buildings and of vegetation models to serve in taking into consideration surface roughness influencing the runoff of the water, 4- Elevation accuracy of laser scannerDTMs, and position accuracy of the border of the flooded area as predicted for floods, 5- Supporting documents for flood management. Numéro de notice : A2003-363 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26443
in GIS Geo-Informations-Systeme > vol 2003 n° 12 (Dezember 2003) . - pp 26 - 32[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 058-03121 RAB Revue Centre de documentation En réserve L003 Disponible La pratique de la télémétrie laser / Michel Kasser in Géomètre, vol 2003 n° 10 (octobre 2003)PermalinkLes promesses d'avenir de la télémétrie laser / Nicolas Paparoditis in Géomètre, vol 2003 n° 10 (octobre 2003)PermalinkSalle des Fêtes de Francfort : un pari logistique et technique / K. Jödicke in Géomètre, vol 2003 n° 10 (octobre 2003)PermalinkCoup d'œil d'ensemble sur les nouvelles méthodes de levé topographique / Claude Million in Géotop, n° 170 (septembre 2003)PermalinkLaser scanning in water management: Dutch water board experience with FLI-MAP / M. Vermeulen in GIM international, vol 17 n° 9 (September 2003)Permalink3D modelling of heritage monuments: increasing realism by combining techniques / Sabry F. El Hakim in GIM international, vol 17 n° 4 (April 2003)PermalinkDemonstrating UVA-acquired real-time thermal data of fires / V.G. Ambrosia in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 4 (April 2003)PermalinkMéthodes de suivi géométrique / Michel Kasser in Géomètre, vol 2003 n° 4 (avril 2003)PermalinkA progressive morphological filter for removing nonground measurements from airborne Lidar data / K. Zhang in IEEE Transactions on geoscience and remote sensing, vol 41 n° 4 (April 2003)PermalinkForum de photogrammétrie [compte-rendu du 30 janvier 2003 Marne-la-Vallée] / H. Berro in XYZ, n° 94 (mars - mai 2003)Permalink