Descripteur
Documents disponibles dans cette catégorie (2280)
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
Etendre la recherche sur niveau(x) vers le bas
Comparison of space borne radar altimetry and airborne laser altimetry over sea ice in the Fram Strait / K.A. Giles in International Journal of Remote Sensing IJRS, vol 27 n°15-16 (August 2006)
![]()
[article]
Titre : Comparison of space borne radar altimetry and airborne laser altimetry over sea ice in the Fram Strait Type de document : Article/Communication Auteurs : K.A. Giles, Auteur ; S.M. Hvidegaard, Auteur Année de publication : 2006 Article en page(s) : pp 3105 - 3113 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] analyse comparative
[Termes IGN] Arctique
[Termes IGN] données laser
[Termes IGN] données localisées 3D
[Termes IGN] données spatiotemporelles
[Termes IGN] glace de mer
[Termes IGN] neige
[Termes IGN] réflectance de surface
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] température de surface de la merRésumé : (Auteur) This paper describes the first comparison of satellite radar and airborne laser altimetry over sea ice. In order to investigate the differences between measurements from the two different instruments, we explore the statistical properties of the data and determine reasonable scales in space and time at which to examine them. The resulting differences between the data sets show that the laser and the radar are reflecting from different surfaces and that the magnitude of the difference decreases with increasing surface air temperature. This suggests that the penetration depth of the radar signal, into the snow, varies with temperature. The results also show the potential for computing Arctic wide snow depth maps by combining measurements from laser and radar altimeters. Copyright Taylor & Francis Numéro de notice : A2006-334 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431160600563273 En ligne : https://doi.org/10.1080/01431160600563273 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28058
in International Journal of Remote Sensing IJRS > vol 27 n°15-16 (August 2006) . - pp 3105 - 3113[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-06081 RAB Revue Centre de documentation En réserve L003 Disponible Error assessment in two lidar-derived TIN datasets / M.H. Peng in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 8 (August 2006)
![]()
[article]
Titre : Error assessment in two lidar-derived TIN datasets Type de document : Article/Communication Auteurs : M.H. Peng, Auteur ; T.Y. Shih, Auteur Année de publication : 2006 Article en page(s) : pp 933 - 947 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] canopée
[Termes IGN] classification dirigée
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] erreur de mesure
[Termes IGN] estimation statistique
[Termes IGN] modèle numérique de surface
[Termes IGN] occupation du sol
[Termes IGN] pente
[Termes IGN] point de vérification
[Termes IGN] précision des données
[Termes IGN] rugosité
[Termes IGN] rugosité du sol
[Termes IGN] semis de points
[Termes IGN] Triangulated Irregular Network
[Termes IGN] variabilité
[Termes IGN] végétationRésumé : (Auteur) An accuracy assessment of two lidar-derived elevation datasets was conducted in areas of rugged terrain (average slope 26.6°). Data from 906 ground checkpoints in various land-cover types were collected in situ as reference points. Analysis of the accuracy of lidar-derived elevation as a function of several factors including terrain slope, terrain aspect, and land-cover types was conducted. This paper attempts to characterize vegetation information derived from lidar data based on variables such as canopy volume, local roughness of point clouds, point spacing of lidar ground returns, and vegetation angle. This information was used to evaluate the accuracy of elevation as a function of vegetation type. The experimental results revealed that the accuracy of elevation was considerably correlated with five factors: terrain slope, vegetation angle, canopy volume, local roughness of point clouds, and point spacing of lidar ground returns. The results show a linear relationship between the elevation accuracy and the combination of vegetation angle and the point spacing of ground returns (r2 > 0.9). The combination of vegetation angle and point spacing of ground returns explains a significant amount of the variability in elevation accuracy. Elevation accuracy varied with different vegetation types. The elevation accuracy was also linearly correlated with the product of the point spacing of ground returns and the tangent of the slope (r2 = 0.9). A greater product value implies a greater elevation error. In addition, with regard to terrain aspect, one dense dataset with extra cross-flight data revealed a lesser impact of aspect on elevation accuracy. Copyright ASPRS Numéro de notice : A2006-312 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.72.8.933 En ligne : https://doi.org/10.14358/PERS.72.8.933 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28036
in Photogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 8 (August 2006) . - pp 933 - 947[article]Towards geodata-based communities / Ron Van Lammeren in GIM international, vol 20 n° 8 (August 2006)
[article]
Titre : Towards geodata-based communities Type de document : Article/Communication Auteurs : Ron Van Lammeren, Auteur ; A. Bergsma, Auteur Année de publication : 2006 Article en page(s) : pp 31 - 33 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Information géographique
[Termes IGN] acquisition de données
[Termes IGN] diffusion de données
[Termes IGN] diffusion par internet
[Termes IGN] données localisées 2D
[Termes IGN] interactivité
[Termes IGN] Open geospatial consortium
[Termes IGN] précision des données
[Termes IGN] qualité des données
[Termes IGN] utilisateur
[Termes IGN] visualisation 3DRésumé : (Auteur) Rapidly evolving technologies such as Web services transform the former digital-map toolbox for specialists into a challenging digital peep-box for everyone. Introduced in 2005, Google Earth is one of the first examples of digital peep-boxes that will soon, suggest the authors, lead to Geodata based Communities (GeoCom). Copyright GITC Numéro de notice : A2006-298 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28025
in GIM international > vol 20 n° 8 (August 2006) . - pp 31 - 33[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 061-06081 RAB Revue Centre de documentation En réserve L003 Disponible Assessment of forest structure with airborne LiDAR and the effects of platform altitude / N.R. Goodwin in Remote sensing of environment, vol 103 n° 2 (30/07/2006)
![]()
[article]
Titre : Assessment of forest structure with airborne LiDAR and the effects of platform altitude Type de document : Article/Communication Auteurs : N.R. Goodwin, Auteur ; Nicholas C. Coops, Auteur ; Darius S. Culvenor, Auteur Année de publication : 2006 Article en page(s) : pp 140 - 152 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] altitude du capteur
[Termes IGN] analyse comparative
[Termes IGN] angle de visée
[Termes IGN] Australie
[Termes IGN] canopée
[Termes IGN] distribution spatiale
[Termes IGN] données lidar
[Termes IGN] empreinte
[Termes IGN] Eucalyptus (genre)
[Termes IGN] forêt
[Termes IGN] houppier
[Termes IGN] impulsion laser
[Termes IGN] inventaire forestier (techniques et méthodes)
[Termes IGN] sylviculture
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Airborne scanning LiDAR is a spatial technology increasingly used for forestry and environmental applications. However, the accuracy and coverage of LiDAR observations is highly dependent on both the extrinsic specifications of the LiDAR survey as well as the intrinsic effects such as the underlying forest structure. Extrinsic parameters which are set as part of the LiDAR survey include platform altitude, scan angle (half max. angle off nadir), and beam cross sectional diameter at the reflecting surface (referred to as footprint size). In this paper we investigate the effect of a number of these extrinsic parameters, including three different platform altitudes (1000, 2000, and 3000 m), two scan angles at 1000 m (10° and 15° half max. angle off nadir), and three footprint sizes (0.2, 0.4, and 0.6 m). The comparison was undertaken in eucalypt forests at three sites, varying in vegetation structure and topography within the Wedding Bells State Forest, Coffs Harbour, Australia. Results at the plot scale (40 * 90 m areas) indicate that tree heights computed from the 1000 m LiDAR data set (10° half max. angle off nadir) are well correlated with maximum plot heights (difference 0.75, p Numéro de notice : A2006-320 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.rse.2006.03.003 En ligne : https://doi.org/10.1016/j.rse.2006.03.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28044
in Remote sensing of environment > vol 103 n° 2 (30/07/2006) . - pp 140 - 152[article]Sensitivity of channel mapping techniques to uncertainty in digital elevation data / J.B. Lindsay in International journal of geographical information science IJGIS, vol 20 n° 6 (july 2006)
![]()
[article]
Titre : Sensitivity of channel mapping techniques to uncertainty in digital elevation data Type de document : Article/Communication Auteurs : J.B. Lindsay, Auteur Année de publication : 2006 Article en page(s) : pp 669 - 692 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Analyse spatiale
[Termes IGN] cartographie automatique
[Termes IGN] données lidar
[Termes IGN] incertitude géométrique
[Termes IGN] modèle numérique de surface
[Termes IGN] réseau de drainage
[Termes IGN] réseau hydrographiqueRésumé : (Auteur) Digital elevation data are now commonly used to map channel networks automatically. This paper evaluates the sensitivity of six methods of extracting channel networks from digital elevation models (DEMs) to elevation error. As such, the robustness of channel mapping techniques against noisy data was evaluated and not the accuracy of DEM extracted channel networks. Stochastic simulations were used in combination with a fine-resolution LiDAR DEM of a small upland catchment to assess the robustness of each of the channel mapping algorithms. Findings showed that the four tested methods that were based on identifying patterns or positions in the surface morphology were more sensitive to elevation error than the two methods that were based on simulating overland flow and channelization processes, particularly at lower error magnitudes. While the morphology-based channel-mapping methods were highly sensitive to the degree of spatial autocorrelation in elevation error fields, the channelization based methods were relatively insensitive. Drainage network extent and the geometry of exterior stream channels were both found to be greatly influenced by low to moderate degrees of topographic error. Although LiDAR data were found to provide a sufficient resolution for mapping fine-scale headwater channels, the greater surface roughness did present challenges for automated channel-mapping techniques. Copyright Taylor & Francis Numéro de notice : A2006-240 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1080/13658810600661433 En ligne : https://doi.org/10.1080/13658810600661433 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27967
in International journal of geographical information science IJGIS > vol 20 n° 6 (july 2006) . - pp 669 - 692[article]Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 079-06061 RAB Revue Centre de documentation En réserve L003 Disponible 079-06062 RAB Revue Centre de documentation En réserve L003 Disponible Assessment and comparison of registration algorithms between aerial images and laser point clouds / A. Pothou in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)
Permalinkn° 182 - Juin 2006 - Des capteurs à l'imagerie : symposium ISPRS commission technique 1, [Actes], Marne la Vallée, 3 - 6 juillet 2006. WG 1/2 SAR and LIDAR, WG 1/3 multi-platform sensing and sensor network (Bulletin de Revue Française de Photogrammétrie et de Télédétection) / Société française de photogrammétrie et de télédétection
PermalinkDisplay of pixel loss and replication in reprojecting raster data from the sinusoidal projection / Denis White in Geocarto international, vol 21 n° 2 (June - August 2006)
PermalinkLa lasergrammetrie appliquée à l'auscultation des ouvrages d'art / B. Chazaly in XYZ, n° 107 (juin - août 2006)
PermalinkMatching topographic surfaces : application to lidar and photogrammetric surfaces / Frédéric Bretar in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)
PermalinkPerformance analysis of ALTM 3100EA: instrument specifications and accuracy of Lidar data / R.V. Ussyshkin in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)
PermalinkAutomated 3D building reconstruction using ALS and digital photogrammetry / S. Nagarajan in GIS development, vol 10 n° 5 (May 2006)
PermalinkDeriving ground surface digital elevation models from Lidar data with geostatistics / C.D. Lloyd in International journal of geographical information science IJGIS, vol 20 n° 5 (may 2006)
PermalinkPermalinkGeneration of DSMs from SPOT-5 in-track HRS and across-track HRG stereo data using spatiotriangulation and autocalibration / Thierry Toutin in ISPRS Journal of photogrammetry and remote sensing, vol 60 n° 3 (May 2006)
Permalink