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Termes IGN > 1- Outils - instruments et méthodes > instrument > instrument de mesure > instrument de mesurage de distances > télémètre > distancemètre > télémètre laser > télémètre laser à balayage > télémètre laser aéroporté > ALTM
ALTMSynonyme(s)Airborne laser terrain mapper |
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Calibration of the optech ALTM-3100 laser scanner intensity data using brightness targets / E. Ahokas in Revue Française de Photogrammétrie et de Télédétection, n° 182 (Juin 2006)
[article]
Titre : Calibration of the optech ALTM-3100 laser scanner intensity data using brightness targets Type de document : Article/Communication Auteurs : E. Ahokas, Auteur ; S. Kaasalainen, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 10 - 16 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] ALTM
[Termes IGN] angle d'incidence
[Termes IGN] angle de visée
[Termes IGN] caméra numérique
[Termes IGN] correction atmosphérique
[Termes IGN] étalonnage en vol
[Termes IGN] étalonnage géométrique
[Termes IGN] étalonnage radiométrique
[Termes IGN] Lidar
[Termes IGN] point d'appui
[Termes IGN] rapport signal sur bruit
[Termes IGN] test de performanceRésumé : (Auteur) In this paper the calibration of Optech ALTM 3100 laser scanner intensity is reported using airborne experiments and known brightness targets. The Finnish Geodetic Institute has had a permanent photogrammetric test field in Sjokulla Kirkkonummi since 1994. This test field contains permanent and transportable test targets for radiometric calibration, permanent ground control points for small, medium and large-scale geometric calibration and also test bar targets for spatial analysis of analogue and digital aerial cameras. Since 2000 LiDAR testing has also been carried out, the latest being Optech ALTM 3100 campaign in 12-14 July 2005. Eight portable brightness targets with nominal reflectance of 5 %, 10 %, 20 %, 25 %, 30 %, 45 %, 50 % and 70 % were in use for LiDAR testing. Flying heights were about 200, 1000 and 3000 m above ground level. Intensity values need to be corrected with respect to range, incidence angle (both BRDF and range correction), atmospheric transmittance, attenuation using dark object addition and transmitted power (because difference in PRF will lead to different transmitter power values). After these corrections, the intensity values were directly relative to target reflectance. Flight heights of 200 m and 1000 m are suitable for intensity calibration using artificial test targets due to the practical aspects of the calibration (size of the calibrator). With the 3000 m altitude signals with reflectance of less or equal of 10% could not be recorded most probably due to insufficient signal-to-noise ratio. Thus, the test target reflectance should exceed 10% to give a reliable distance measurement from 3000 m altitude. Numéro de notice : A2006-618 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/T03-11.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28341
in Revue Française de Photogrammétrie et de Télédétection > n° 182 (Juin 2006) . - pp 10 - 16[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 018-06021 RAB Revue Centre de documentation En réserve L003 Disponible Examining the influence of changing laser pulse repetition frequencies on conifer forest canopy returns / Laura Chasmer in Photogrammetric Engineering & Remote Sensing, PERS, vol 72 n° 12 (December 2006)
[article]
Titre : Examining the influence of changing laser pulse repetition frequencies on conifer forest canopy returns Type de document : Article/Communication Auteurs : Laura Chasmer, Auteur ; Christopher Hopkinson, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 1359 - 1367 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] ALTM
[Termes IGN] canopée
[Termes IGN] données lidar
[Termes IGN] données multitemporelles
[Termes IGN] forêt boréale
[Termes IGN] fréquence
[Termes IGN] impulsion laser
[Termes IGN] lasergrammétrie
[Termes IGN] onde radioélectrique
[Termes IGN] Pinophyta
[Termes IGN] surface du sol
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] vibrationRésumé : (Auteur) The distribution of laser pulses within conifer forest trees and canopies are examined by varying the rate of laser pulse emission and the inherent laser pulse properties (laser pulse energy, pulse width, pulse length, and roll-over or trigger time). In this study, an Optech, Inc. ALTM 3100 airborne lidar is used, emitting pulses at 50 kHz and 100 kHz, allowing for changes in laser pulse characteristics while also keeping all other survey parameters equal. We found that:
1. Pulses and associated characteristics emitted at 50 kHz penetrated further into the canopy than 100 kHz for a significant number of individual trees.
2. At tall tree plots with no understory, pulses emitted at 50 kHz penetrated further into the canopy than 100 kHz for a significant number of plots.
3. For plots with significant understory and shorter trees, pulses emitted at 100 kHz penetrated further into the canopy than 50 kHz. We suspect that this may be due, in part, to canopy openness.
Laser pulse energy and character differences associated with different laser pulse emission frequencies are likely a contributing factor in laser pulse penetration through the canopy to the ground surface. Efforts to understand laser pulse character influences on canopy returns are important as biomass and vegetation structure models derived from lidar are increasingly adopted. Copyright ASPRSNuméro de notice : A2006-544 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article DOI : 10.14358/PERS.72.12.1359 En ligne : https://doi.org/10.14358/PERS.72.12.1359 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28267
in Photogrammetric Engineering & Remote Sensing, PERS > vol 72 n° 12 (December 2006) . - pp 1359 - 1367[article]A robust method for filtering non-ground measurements from airborne Lidar data / F. Crosilla in GIS Geo-Informations-Systeme, vol 2004 n° 12 (Dezember 2004)
[article]
Titre : A robust method for filtering non-ground measurements from airborne Lidar data Type de document : Article/Communication Auteurs : F. Crosilla, Auteur ; D. Visintini, Auteur ; G. Prearo, Auteur Année de publication : 2004 Article en page(s) : pp 35 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] algorithme de filtrage
[Termes IGN] ALTM
[Termes IGN] corrélation
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] filtrage numérique d'image
[Termes IGN] interaction spatiale
[Termes IGN] Italie
[Termes IGN] lasergrammétrie
[Termes IGN] Matlab
[Termes IGN] méthode robuste
[Termes IGN] modèle de régressionRésumé : (Auteur) This paper proposes a new filtering method of non-ground measurements from airborne LIDAR data through a Simultaneous Auto-Regressive (SAR) analytical model and exploiting a Foward Search (FS) algorithm. In SAR models, with respect to classical spatial regression models, the correlation among adjacent measured points is taken into account, by considering two quantities for the measured dataset : a coefficient of spatial interaction and matrix of point adjacency (binary digits for regular grids or real numbers for irregular ones). The method has been implemented using Matlab® language and applied either to differently simulated LIDAR datasets or really measured points, these last acquired with an Optech® ALTM 3033 system in the city of Gorizia (North-east Italy). Numéro de notice : A2004-532 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27049
in GIS Geo-Informations-Systeme > vol 2004 n° 12 (Dezember 2004) . - pp 35 - 41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 058-04121 RAB Revue Centre de documentation En réserve L003 Disponible Accuracy of airborne lidar derived elevation: empirical assessment and error budget / M.E. Hodgson in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 3 (March 2004)
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Titre : Accuracy of airborne lidar derived elevation: empirical assessment and error budget Type de document : Article/Communication Auteurs : M.E. Hodgson, Auteur ; P. Bresnahan, Auteur Année de publication : 2004 Article en page(s) : pp 331 - 339 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] altitude
[Termes IGN] ALTM
[Termes IGN] cartographie topographique
[Termes IGN] données lidar
[Termes IGN] GPS en mode statique
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] utilisation du sol
[Termes IGN] valeur efficaceRésumé : (Auteur) As part of a countywide large-scale mapping effort for Richland County, South Carolina, an accuracy assessment of a recently acquired lidar-derived data set was conducted. Airborne lidar (2m nominal posting) was collected at a flying height of 1207 meters above ground level (AGL) using an Optech ALTM (Airborne Laser Terrain Mapper) 1210 system. Unique to this study are the reference point elevations. Rather than using an interpolation approach for gathering observed elevations at reference points, the x-y coordinates of lidar points were located in the field and these elevations were surveyed. Using both total-station-based and rapid-static GPS techniques, observed vertical heights were measured at each reference lidar posting. The variability of vertical accuracy was evaluated for six land-cover categories. Root-mean-squared error (RmsE) values ranged from a low of 17 to 19 cm (pavement, low grass, and evergreen forests) to a high of 26 cm (deciduous forests). The unique error assessment of lidar postings also allowed for the creation of an error budget model. The observed lidar elevation error was decomposed into errors from lidar system measurements, horizontal displacement, interpolation error, and surveyor error. A cross-validation approach was used to assess the observed interpolated lidar elevation error for each field-verified reference point. In order of decreasing importance, the lidar system measurements were the dominant source of error-followed by interpolation error, horizontal displacement error, and surveyor error. Observed elevation error in steeper slopes (e.g., 25°) was estimated to be twice as large as those on low slopes (e.g., 1.5°). Copyright ASPRS Numéro de notice : A2004-103 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.3.331 En ligne : https://doi.org/10.14358/PERS.70.3.331 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26630
in Photogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 3 (March 2004) . - pp 331 - 339[article]Data fusion of high-resolution satellite imagery and Lidar data for automatic building extraction / Gunho Sohn in ISPRS Journal of photogrammetry and remote sensing, vol 62 n° 1 (May 2007)
[article]
Titre : Data fusion of high-resolution satellite imagery and Lidar data for automatic building extraction Type de document : Article/Communication Auteurs : Gunho Sohn, Auteur ; Ian J. Dowman, Auteur Année de publication : 2007 Article en page(s) : pp 43 - 63 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques
[Termes IGN] ALTM
[Termes IGN] arbre BSP
[Termes IGN] détection du bâti
[Termes IGN] données lidar
[Termes IGN] espace objet
[Termes IGN] extraction automatique
[Termes IGN] fusion de données multisource
[Termes IGN] image Ikonos
[Termes IGN] Normalized Difference Vegetation Index
[Termes IGN] polygone
[Termes IGN] semis de points
[Termes IGN] spatial metricsRésumé : (Auteur) This paper aims to present a new approach for automatic extraction of building footprints in a combination of the IKONOS imagery with pan-sharpened multi-spectral bands and the low-sampled (not, vert, similar 0.1 points/m2) airborne laser scanning data acquired from the Optech's 1020 ALTM (Airborne Laser Terrain Mapper). Initially, a laser point cluster in 3D object space was recognized as an isolated building object if all the member points were similarly attributed as building points by investigating the height property of laser points and the normalized difference vegetation indices (NDVI) driven from IKONOS imagery. As modelling cues, rectilinear lines around building outlines collected by either data-driven or model-driven manner were integrated in order to compensate the weakness of both methods. Finally, a full description of building outlines was accomplished by merging convex polygons, which were obtained as a building region was hierarchically divided by the extracted lines using the Binary Space Partitioning (BSP) tree. The system performance was evaluated by objective evaluation metrics in comparison to the Ordnance Survey's MasterMap®. This evaluation showed the delineation performance of up to 0.11 (the branching factor) and the detection percentage of 90.1% (the correctness) and the overall quality of 80.5%. Copyright ISPRS Numéro de notice : A2007-214 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.01.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.01.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28577
in ISPRS Journal of photogrammetry and remote sensing > vol 62 n° 1 (May 2007) . - pp 43 - 63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 081-07031 SL Revue Centre de documentation Revues en salle Disponible Geometric validation of imagery and products from a high performance airborne digital sensor / Jon P. Mills in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 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)Permalink