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Termes IGN > mesurage de distances > télémétrie > télémétrie laser > télémétrie laser aéroporté
télémétrie laser aéroportéSynonyme(s)lever par lidar aéroporté ;lever par laser aéroporté altimétrie par laser aéroportéVoir aussi |
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Factors influencing pulse width of small footprint, full wave form airborne laser scanning data / Y.C. Lin in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 1 (January 2010)
[article]
Titre : Factors influencing pulse width of small footprint, full wave form airborne laser scanning data Type de document : Article/Communication Auteurs : Y.C. Lin, Auteur ; Jon P. Mills, Auteur Année de publication : 2010 Article en page(s) : pp 49 - 59 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] balayage laser
[Termes IGN] classification automatique
[Termes IGN] impulsion laser
[Termes IGN] lidar à retour d'onde complète
[Termes IGN] longueur d'onde
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Small footprint, full waveform airborne laser scanning provides the opportunity to derive high-resolution geometric and physical information simultaneously from a single scanner system. This study evaluates the influence of various factors on the shape of the returned waveform and investigates the possibility of improving terrain classification by applying waveform-derived information. The factors discussed are surface roughness, slope angle, scan angle, amplitude, and footprint size. It is statistically demonstrated that roughness is the most significant factor affecting pulse width, and that, over relatively smooth surfaces, there is no significant variation in pulse width behavior resulting from different footprint sizes. Pulse width also exhibits a relatively stable behavior when amplitude, range distance, or scan angle vary substantially. The overall accuracy of classification achieved by applying pulse width information over all the different land-cover types examined in this study (including scrub, hillside, single trees, and forest areas) was greater than 85 percent, with > 94 percent achieved for open vegetation areas. Physical surface information provided by small footprint waveform data is considered to be at the microscale, therefore it is recommended to combine such information with geometry (e.g., filtering algorithms) for the optimal identification of terrain points. Copyright ASPRS Numéro de notice : A2010-013 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.76.1.49 En ligne : https://doi.org/10.14358/PERS.76.1.49 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30209
in Photogrammetric Engineering & Remote Sensing, PERS > vol 76 n° 1 (January 2010) . - pp 49 - 59[article]In-flight quality assessment and data processing for airborne laser scanning / Philipp Schaer (2010)
Titre : In-flight quality assessment and data processing for airborne laser scanning Type de document : Thèse/HDR Auteurs : Philipp Schaer, Auteur ; Jan Skaloud, Directeur de thèse Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2010 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 79 Importance : 166 p. Format : 20 x 30 cm ISBN/ISSN/EAN : 978-3-908440-23-9 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] estimation statistique
[Termes IGN] étalonnage d'instrument
[Termes IGN] étalonnage en vol
[Termes IGN] géoréférencement direct
[Termes IGN] implémentation (informatique)
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] qualité des données
[Termes IGN] semis de points
[Termes IGN] télémétrie laser aéroportéIndex. décimale : 33.80 Lasergrammétrie Résumé : (Auteur) [introduction] [...] The objectives of this research are threefold: 1. Elaborate the theoretical concepts and methodologies needed for performing fast and automated QA/QC of ALS data. This embraces the definition of a methodology to automatically assess the quality of laser measurements and to evaluate the point-cloud coverage and homogeneity. A further objective is to establish a concept to assess the accuracy of derived surface models. 2. Implement the theoretical concepts in a fully functional in-flight QA/QC tool embedded in an ALS system. This requires merging data streams from different technologies (i.e. inertial navigation, GNSS positioning, laser measurements) in real-time (RT), developing its qualitative evaluation and presenting it to the system operator. 3. Provide a thorough analysis of the system performance using data acquired under real operating conditions. The objective is to demonstrate the usefulness of the provided QC information in-flight and to determine the achievable accuracies for ALS data processed in-flight. A particular attention is payed to the evaluations of benefits using real-time Kinematics (RTK) for improving the accuracy of the RT navigation, point-cloud generation and derivation of quality metrics. [...] Note de contenu : 1 Introduction
1.1 Context
1.2 Research Objectives
1.3 Methodology
1.4 External Contributions
1.5 Thesis Outline
2 ALS Enabling Technologies
2.1 Airborne Laser Scanning
2.1.1 History of ALS Technology
2.1.2 Current in-flight QA/QC Capabilities
2.1.3 Trends in ALS
2.2 Direct Georeferencing: Basic Relations
2.3 Laser Scanner Technology
2.4 Positioning Technology
2.5 Integrated Navigation Technology
3 ALS System Calibration and Point-cloud Processing
3.1 System Calibration
3.2 Strip Adjustment
3.3 ALS Point-cloud Data Processing
3.4 Digital Elevation Models
4 Point-cloud Quality Assessment
4.1 Overview of ALS Error Sources
4.2 ALS Navigation Errors
4.3 ALS System Errors
4.4 Assessment of ALS Target Accuracy
4.5 Assessment of Scanning Geometry
4.6 Single Point Quality Indicator
4.7 Error Budget Evaluation
4.8 Use of Quality Indicators in Point-cloud Processing
5 Surface Quality Assessment
5.1 Data Coverage Analysis
5.2 Internal Data Accuracy
5.3 Height Model Data Accuracy .
6 Implementation
6.1 Handheld Airborne Mapping System
6.2 Flight Preparation
6.3 In-flight Quality Assessment Tool (IQUAL)
6.4 GPS Quality Analysis Module (GPSQUAL)
6.5 RT GPS/INS Integration Engine (GIINAV)
6.6 RT ALS Georeferencing Engine (LIEOS)
6.7 LiDAR Quality Analysis Module (LIAN)
6.8 Flight Management and Monitoring Module (HELIPOS)
7 Results and Performance Analysis
7.1 RT Trajectory and Point-cloud Accuracy
7.2 Trajectory Quality Analyses (GPSQUAL)
7.3 ALS Point-cloud Quality Analysis (LIAN)
7.4 Computational Performance
8 Conclusion and Perspectives
8.1 Summary of Contributions
8.2 Conclusions
8.3 Perspectives
Bibliography
A Derivation of Sub-matrices
B Computation of 3D Laser Footprint
C Comparison RT - PPNuméro de notice : 10368 Affiliation des auteurs : non IGN Autre URL associée : URL EPFL Thématique : IMAGERIE Nature : Thèse étrangère Note de thèse : PhD thesis : : EPFL : 2010 DOI : 10.5075/epfl-thesis-4590 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-79.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62407 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 10368-01 33.80 Livre Centre de documentation Photogrammétrie - Lasergrammétrie Disponible Sea surface topography and marine geoid by airborne laser altimetry and shipborne ultrasound altimetry / Philippe Limpach (2010)
Titre : Sea surface topography and marine geoid by airborne laser altimetry and shipborne ultrasound altimetry Type de document : Thèse/HDR Auteurs : Philippe Limpach, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2010 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 80 Importance : 208 p. Format : 20 x 30 cm ISBN/ISSN/EAN : 978-3-908440-24-6 Note générale : Bibliographie
Doctoral thesisLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] anomalie de pesanteur
[Termes IGN] bathymétrie acoustique
[Termes IGN] Crète (île)
[Termes IGN] données Jason
[Termes IGN] Egée, mer
[Termes IGN] géoïde altimétrique
[Termes IGN] géoïde local
[Termes IGN] geoïde marin
[Termes IGN] géoréférencement direct
[Termes IGN] GPS en mode cinématique
[Termes IGN] GPS en mode différentiel
[Termes IGN] océanographie dynamique
[Termes IGN] relief de la surface de la mer
[Termes IGN] sondage acoustique
[Termes IGN] surface de la mer
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] validation des donnéesIndex. décimale : 30.83 Applications océanographiques de géodésie spatiale Résumé : (Auteur) The aim of this project was to contribute to the improvement of sea level monitoring and to provide local-scale information on the short-wavelength structure of the marine gravity field, by developing enhanced methods for offshore sea surface height observations. The methods include airborne laser altimetry, shipborne ultrasound altimetry and GPS-equipped buoys. In a first step, instrumental aspects of sea surface height observations by airborne and shipborne altimetry were analyzed. Precise position and attitude of the range sensor are crucial for an accurate sea surface height computation. For this purpose, the survey aircraft and boat were equipped with a multi-antenna GPS array and inertial systems. Sea surface heights were computed from the range data by direct georeferencing. Important aspects are the influences of errors in the differential kinematic GPS positioning and in the attitude determination, as well as the calibration of boresight misalignments. In a second step, the obtained sea surface heights were reduced to mean sea surface by applying corrections for geophysical effects, including waves, tides, atmospheric pressure and wind forcing.
In the framework of this work, several regional campaigns for sea surface height surveys based on airborne and shipborne altimetry were carried out in the Eastern Mediterranean Sea. Dedicated surveys, including deployments of GPS buoys, were performed along Jason-1 radar altimetry ground tracks. Airborne laser altimetry data was acquired along densely spaced flight tracks covering an area of 200 by 200km around the western part of the island of Crete, Greece, in the vicinity of the Hellenic Trench. The objective was the determination of a detailed regional geoid and sea surface topography model in the framework of the GAVDOS project, funded by the European Union. Furthermore, several shipborne campaigns for sea surface height observations were carried out in the North Aegean Sea, in the vicinity of the North Aegean Trough.
Based on the airborne and shipborne altimetry data, a high-resolution sea surface topography of the survey areas was computed, with an accuracy of better than 10 cm. Geoid undulations were derived from the sea surface heights by subtracting the mean dynamic ocean topography induced by oceanic currents. Around western Crete, the geoid obtained from airborne laser altimetry is characterized by very large gradients, with an average height difference of 20m along a distance of only 200km and maximum local gradients of 22 cm/km. These gradients are a clear indication for significant gravity effects caused by the bathymetry and the geodynamic system of the Hellenic Trench. In the survey area in the North Aegean Sea, the geoid obtained from shipborne altimetry shows a distinct depression of 1.5 m, indicating a connection with the bathymetry and the geodynamic features of the North Aegean Trough.
The high resolution and accuracy of the sea surface and geoid heights obtained were verified by comparisons with mean sea surface models from multi-mission satellite radar altimetry, as well as with global and regional geoid models. The reduction of the geoid heights for modeled mass effects of topography, bathymetry, marine sedimentary deposits and crust-mantle boundary revealed pronounced gravity anomalies related to the geodynamic processes in the survey areas.Note de contenu : 1 Introduction
1.1 Motivation and Goals
1.2 Geophysical Characteristics of the Eastern Mediterranean
1.3 Former Work by the GGL in Related Fields of Research
1.4 Research Tasks and Project Outline
2 Geoid, Sea Surface and Dynamic Ocean Topography
2.1 Introduction
2.2 Geoid
2.3 Mean Sea Surface
2.4 Sea Level Anomaly
2.5 Dynamic Ocean Topography
2.6 Permanent Tide
3 Geophysical Effects on Sea Surface Heights
3.1 Introduction
3.2 Ocean Waves
3.3 Tides
3.4 Atmospheric Pressure and Wind Forcing
4 Airborne Laser Altimetry
4.1 Introduction
4.2 Instumental Setup
4.3 Laser Ranging
4.4 Laser Backscatter from Sea Surface
5 Shipborne Ultrasound Altimetry
5.1 Introduction
5.2 Instrumental Setup
5.3 Ultrasound Ranging
5.4 Sensor Synchronization
6 Direct Georeferencing
6.1 Introduction
6.2 Basic Principle
6.3 Kinematic GPS Positioning
6.4 Multi-Antenna GPS Attitude Determination
6.5 Boresight Misalignment Calibration in Airborne Altimetry
7 Sea Surface Heights by Airborne Laser Altimetry around Western Crete
7.1 GAVDOS Airborne Laser Altimetry Campaign
7.2 Instantaneous Sea Surface Height Profiles
7.3 Sea Surface Height Corrections
7.4 Repeatability Analysis
7.5 Time-Independent Sea Surface Topography
8 Sea Surface Heights by Shipborne Ultrasound Altimetry in the North Aegean Sea
8.1 Shipborne Ultrasound Altimetry Campaigns
8.2 Instantaneous Sea Surface Height Profiles
8.3 Sea Surface Height Corrections
8.4 Repeatability Analysis
8.5 Time-Independent Sea Surface Topography
9 Validation of Satellite Radar Altimetry Data
9.1 Introduction
9.2 Validation of Jason-1 Data with Airborne Laser Altimetry
9.3 Validation of Mean Sea Surface from Radar Altimetry
10 Geoscientific Exploitation of Airborne Altimetry Data around Western Crete
10.1 Marine Geoid, Gravity Anomalies and Deflections of the Vertical from Sea Surface Heights
10.2 Local Altimetric Geoid vs. Existing Models
10.3 Mean Dynamic Topography Estimation
10.4 Modeled Mass Effects on Geoid Heights and Gravity
10.5 Mass Reduction of Local Altimetric Geoid
11 Geoscientific Exploitation of Shipborne Altimetry Data in the North Aegean Sea
11.1 Marine Geoid, Gravity Anomalies and Deflections of the Vertical from Sea Surface Heights
11.2 Local Altimetric Geoid vs. Existing Models
11.3 Mean Dynamic Topography Estimation
11.4 Modeled Mass Effects on Geoid Heights and Gravity
11.5 Mass Reduction of Local Altimetric Geoid
12 Summary and ConclusionsNuméro de notice : 10369 Affiliation des auteurs : non IGN Autre URL associée : URL ETH Zurich Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : 10.3929/ethz-a-005876550 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-80.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62408 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 10369-01 30.83 Livre Centre de documentation Géodésie Disponible Relevé, modélisation 3D et intégration SIG d'ouvrages d'art pour le projet Genève 3D / David Desbuisson in XYZ, n° 121 (décembre 2009 - février 2010)
[article]
Titre : Relevé, modélisation 3D et intégration SIG d'ouvrages d'art pour le projet Genève 3D Type de document : Article/Communication Auteurs : David Desbuisson, Auteur ; Christian Haller, Auteur ; Laurent Niggeler, Auteur ; T. Sangouard, Auteur Année de publication : 2009 Article en page(s) : pp 21 - 26 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes d'information géographique
[Termes IGN] Bâti-3D
[Termes IGN] données laser
[Termes IGN] Genève
[Termes IGN] lever mobile
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] modélisation 3D
[Termes IGN] ouvrage d'art
[Termes IGN] restitution
[Termes IGN] SIG 3D
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Le canton de Genève a débuté, vers 1985, une imposante saisie de plusieurs centaines de millions de métadonnées 2D, centralisées aujourd'hui dans une seule base géographique SIG, ESRI, de notoriété mondiale, accessible gratuitement via internet (www.sitg.ch). Parmi les quelque 500 couches actuellement à disposition, certaines d'entre elles (parcellaire, bâtiments,...) ont la "foi publique" autrement dit force juridique. Depuis quelques années, la troisième dimension devient manifestement un outil de politique publique, tant pour ce qui concerne la gestion du territoire au quotidien, que pour la compréhension des projets d'aménagement, la concertation entre les collectivités, les élus, la population et la prise de décisions durables. L'ampleur des possibilités offerte par la 3D permettrait presque de contredire le principe fondamental selon lequel "la carte n'est pas le territoire". Numéro de notice : A2009-486 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE/INFORMATIQUE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30115
in XYZ > n° 121 (décembre 2009 - février 2010) . - pp 21 - 26[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 112-09041 RAB Revue Centre de documentation En réserve L003 Exclu du prêt Documents numériques
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Relevé, modélisation 3D et intégration SIG d'ouvrages d'art pour le projet Genève 3D - pdf éditeurAdobe Acrobat PDF The building shadow problem of airborne lidar / T.Y. Shih in Photogrammetric record, vol 24 n° 128 (December 2009 - February 2010)
[article]
Titre : The building shadow problem of airborne lidar Type de document : Article/Communication Auteurs : T.Y. Shih, Auteur ; C. Huang, Auteur Année de publication : 2009 Article en page(s) : pp 372 - 385 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] champ visuel
[Termes IGN] données lidar
[Termes IGN] modèle numérique de surface
[Termes IGN] ombre
[Termes IGN] plan de vol
[Termes IGN] semis de points
[Termes IGN] télémétrie laser aéroportéRésumé : (Auteur) Airborne lidar systems are equipped with a scanning mechanism that produces a swath of 3D coordinated points to form a cloud in each flight strip. The scanning is perpendicular to the direction of flight. The density of the point cloud is one of the major quality measures for the data collected with such systems. Point density, shade (occlusion of the laser beam) and penetration rate are major factors to be considered in the flight design. For practical operations, flight missions may be designed with overlaps ranging from 5 to 50%. Aside from the percentage overlap, the field of view is another important parameter for flight design. An evaluation scheme to assess the percentage overlap between flight strips and the selection of the field of view is proposed in this study. The influences of overlap and field of view are also demonstrated with real data gathered by an airborne lidar system. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-498 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00550.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00550.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30127
in Photogrammetric record > vol 24 n° 128 (December 2009 - February 2010) . - pp 372 - 385[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 106-09041 RAB Revue Centre de documentation En réserve L003 Disponible Small-footprint laser scanning simulator for system validation, error assessment, and algorithm development / Antero Kukko in Photogrammetric Engineering & Remote Sensing, PERS, vol 75 n° 10 (October 2009)PermalinkEstimation du volume de bois exploitable en montagne par scanner laser aeoporté (Lidar) / Nicolas Clouet in Géomatique expert, n° 70 (01/09/2009)PermalinkScannérisation laser et photogrammétrie : deux techniques complémentaires pour l'étude des risques naturels par télédétection rapprochée en haute montagne / T. Villemin in XYZ, n° 120 (septembre - novembre 2009)PermalinkAirborne Lidar: in-flight accuracy estimation / Philipp Schaer in GPS world, vol 20 n° 8 (August 2009)PermalinkScanner laser : des utilisations de plus en plus nombreuses / Michel Kasser in Géomètre, n° 2058 (avril 2009)PermalinkL'altimétrie aéroportée de précision : LIDAR topographique et recherche / Frédéric Bretar in XYZ, n° 118 (mars - mai 2009)PermalinkContrôle de l'intégrité GPS en temps réel et géoréférencement direct par RTK-GPS pour le levé laser aéroporté / Yannick Stebler in Géomatique suisse, vol 107 n° 3 (01/03/2009)PermalinkModelling the great wall of China / Z. Wang in GIM international, vol 23 n° 2 (February 2009)PermalinkFull-waveform topographic lidar: State-of-the-art / Frédéric Bretar in ISPRS Journal of photogrammetry and remote sensing, vol 64 n° 1 (January - February 2009)PermalinkIFSAR and LIDAR: the best of both worlds / Intermap technologies in GEO: Geoconnexion international, vol 8 n° 1 (january 2009)Permalink