Descripteur
Termes IGN > mesurage de distances > télémétrie > télémétrie laser
télémétrie laserSynonyme(s)Télémétrie par laserVoir aussi |
Documents disponibles dans cette catégorie (516)
![](./images/expand_all.gif)
![](./images/collapse_all.gif)
Etendre la recherche sur niveau(x) vers le bas
CAMPINO, a skeletonization method for point cloud processing / Alexander Bucksch in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 1 (January - February 2008)
![]()
[article]
Titre : CAMPINO, a skeletonization method for point cloud processing Type de document : Article/Communication Auteurs : Alexander Bucksch, Auteur ; R. Linderberg, Auteur Année de publication : 2008 Article en page(s) : pp 115 - 127 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image
[Termes IGN] balayage laser
[Termes IGN] segmentation d'image
[Termes IGN] semis de points
[Termes IGN] squelettisation
[Termes IGN] télémètre laser terrestre
[Termes IGN] traitement géométrique de données
[Termes IGN] végétationRésumé : (Auteur) A new algorithm for deriving skeletons and segmentations from point cloud data in O(n) time is explained in this publication. This skeleton is represented as a graph, which can be embedded into the point cloud. The CAMPINO method, (C)ollapsing (A)nd (M)erging (P)rocedures (IN) (O)ctree-graphs, is based on cycle elimination in a graph as derived from an octree based space division procedure. The algorithm is able to extract the skeleton from point clouds generated from either one or multiple viewpoints. The correspondence between the vertices of the graph and the original points of the point cloud is used to derive an initial segmentation of these points. The principle of the algorithm is demonstrated on a synthetic point cloud consisting of 3 connected tori. Initially this algorithm was developed to obtain skeletons from point clouds representing natural trees, measured with the terrestrial laser scanner IMAGER 5003 of Zoller+Fröhlich. The results show that CAMPINO is able to automatically derive realistic skeletons that fit the original point cloud well and are suited as a basis for e.g. further automatic feature extraction or skeleton-based registration. Copyright ISPRS Numéro de notice : A2008-040 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2007.10.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2007.10.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29035
in ISPRS Journal of photogrammetry and remote sensing > vol 63 n° 1 (January - February 2008) . - pp 115 - 127[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-08011 SL Revue Centre de documentation Revues en salle Disponible
[article]
Titre : Continous mobile laser scanning Type de document : Article/Communication Auteurs : F. Zampa, Auteur ; D. Conforti, Auteur Année de publication : 2008 Article en page(s) : pp 39 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] GPS-INS
[Termes IGN] mine
[Termes IGN] positionnement par GPS
[Termes IGN] route
[Termes IGN] système de numérisation mobile
[Termes IGN] télémétrie laser terrestreRésumé : (Auteur) Combining Terrestrial Laser Scanning, Position and Orientation Systems and GPS receivers into a mobile mapping system enables effective mapping of large and complex terrain. The authors tested a mobile mapping system at two sites: in an open pit mine, and along a road. Copyright Reed Business Information Numéro de notice : A2008-003 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28998
in GIM international > vol 22 n° 1 (January 2008) . - pp 39 - 41[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 061-08011 RAB Revue Centre de documentation En réserve L003 Disponible Eléments de physique pour l'imagerie aérienne et spatiale et la géodésie [diaporama pour le master PPMD] / Michel Kasser (2008)
![]()
Titre : Eléments de physique pour l'imagerie aérienne et spatiale et la géodésie [diaporama pour le master PPMD] Type de document : Guide/Manuel Auteurs : Michel Kasser , Auteur
Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2008 Importance : 160 p. Format : 30 x 21 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Rayonnement électromagnétique
[Termes IGN] albedo
[Termes IGN] chambre DTC
[Termes IGN] colorimétrie
[Termes IGN] détecteur à transfert de charge
[Termes IGN] diffusion de Mie
[Termes IGN] diffusion de Rayleigh
[Termes IGN] diffusion du rayonnement
[Termes IGN] distorsion d'image
[Termes IGN] espace colorimétrique
[Termes IGN] image RVB
[Termes IGN] propagation troposphérique
[Termes IGN] rayonnement électromagnétique
[Termes IGN] réflexion spéculaire
[Termes IGN] réfraction atmosphérique
[Termes IGN] synthèse trichromatique
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] télémétrie laser terrestreRésumé : (Documentaliste) Ce diaporama présente différentes connaissances relatives à la propagation des ondes électromagnétiques (réfraction et diffusion), à la colorimétrie des images, à la géométrie des images aériennes et spatiales et aborde la technologie des capteurs (chambre numérique DTC, laser). Numéro de notice : 14350 Affiliation des auteurs : IGN (1940-2011) Thématique : IMAGERIE Nature : Manuel de cours IGN Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=46390 Documents numériques
en open access
14350_diaporama_elementsphysiquemastppmd_kasser.pdfAdobe Acrobat PDFEntwicklung eines Qualitätsmodells für die Generierung von digitalen Gelandemodellen aus airborne Laser scanning / Hans Jürg Luthy (2008)
![]()
Titre : Entwicklung eines Qualitätsmodells für die Generierung von digitalen Gelandemodellen aus airborne Laser scanning Titre original : [Développement d'un modèle de qualité pour générer des modèles numériques de terrain à partir de télémétrie laser aéroportée] Type de document : Thèse/HDR Auteurs : Hans Jürg Luthy, Auteur Editeur : Zurich : Institut für Geodäsie und Photogrammetrie IGP - ETH Année de publication : 2008 Collection : IGP Mitteilungen, ISSN 0252-9335 num. 95 Importance : 140 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-906467-70-2 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données lidar
[Termes IGN] géoréférencement direct
[Termes IGN] GPS en mode différentiel
[Termes IGN] GPS-INS
[Termes IGN] indicateur de qualité
[Termes IGN] mesure de la qualité
[Termes IGN] modèle numérique de surface
[Termes IGN] modèle numérique de terrain
[Termes IGN] qualité des données
[Termes IGN] spécification
[Termes IGN] télémétrie laser aéroporté
[Termes IGN] test de performanceIndex. décimale : 35.20 Traitement d'image Résumé : (Auteur) Airborne Laser Scanning (ALS) has become the most important technology in Europe to acquire high resolution Digital Elevation Models (DEM). Compared to the well established Photogrammetry ALS allows an increased efficiency due to direct georeferencing and direct determination of 3D coordinates. The dense point spacing and the possibility to acquire simultaneous Digital Terrain (DTM) and Digital Surface Models (DSM) are additional benefits. Some of the drawbacks of ALS are known from other methods to acquire spatial data: the abstraction of the real world in a data model is strongly influenced by the impossibility to validate the quality of data acquisition by the use of on set of reference data. As a matter of fact only partial verification of single characteristics is performed using adequate methods or reference information. A well known example for this is the determination of vertical accuracy using ground control points.
The two main disadvantages compared to Photogrammetry are the number of involved sensors and the unstructured data capturing during the scanning process. The former leads - in combination with the separation in different data processing activities - to a delayed discovery of faults in the data acquisition. Not captured features (completeness of data acquisition) are often detected later on in the feature extraction. Whilst for other survey methods quality measures had been developed over years, standards or guidelines for ALS with appropriate quality indicators and test methods are still missing. The separation between the determination of coordinates in the unstructured data acquisition and the feature extraction during point classification may have a negative impact on the data quality. The use of the spatial accuracy as the dominant indicator to measure the quality of a DEM is not suited to detect errors in the point classification. Delays and excessive costs in many projects are the consequence of this lack of complete specifications if a principal conducts thorough visual inspection of the deliverables.
This thesis introduces a quality model which eliminates the above listed shortcomings. In a holistic approach sensors, algorithms and processes are examined on their impact on spatial data described. The quality model is built up on the requirements set forth in the ISO standards for quality management and for spatial data but is also taking into account the (unique) properties of the ALS technology and the sensitive customer relationship. The core element of the model is the product specification where the representation of the real world in the spatial data set is defined. The non-quantitative quality element is completed by the Meta data further information to allow traceability. To the second layer of the quality model belong various components to describe the quantitative quality indicators. By extending the elements from currently used spatial accuracy and point spacing all user requirements can be captured in technical specifications. The benefit can only be achieved if appropriate test methods and the acceptable conformance quality level are defined. The thesis does not attempt to define a minimum acceptable level of quality for DEMs since they strongly depend on individual user requirements but proposes ideas how the quality elements may be used. The third layer then defines requirements for process quality. Here it is distinguished between the processes for product realisation and management processes. The activities on the technical side directly impact the quality of the products and include inter alia sensor system, data processing, verification and documentation. The mid and long term quality of the products and realisation processes is achieved through the management processes. Special attendance is needed for data management due to the huge volume of data. As the outcome of the three inner layers the outermost contains finally the spatial data sets according to product definitions and technical specifications.
The complexity of the processes and the data volume requires suitable software tools, particularly for larger projects. A high level system architecture and the base functionality of such a production suite for ALS are outlined and the positive effects in the production due to increased efficiency and effectivity are demonstrated.
The benefits and the advantages of the quality model in the practical application are discussed on a large project for the Federal Office of Topographic (swisstopo).Note de contenu : l Einführung
1.1 Ausgangslage und Motivation
1.2 Ziel der Arbeit
1.3 Gliederung der Arbeit
1.4 Qualitäts- und Prozessmanagement
1.4.1 Erläuterung zum Begriff Qualität
l .4.2 Grundzüge des Qualitätsmanagements
1.4.3 Prozesse
1.4.4 Qualitätsplanung
1.4.5 Qualitätsmanagement bei ALS-Projekten
1.5 Qualität im Vermessungswesen
1.6 Qualität von Geodäten
1.6.1 Produktmerkmale
1.6.2 Allgemeine Qualitätsmerkmale von Geodäten
1.6.3 Die Qualitätsmerkmale der ISO Geonormen
1.6.4 Der Prozess der Qualitätsprüfung
1.6.5 Dokumentation der Qualitätsinformation
1.7 Qualität von Digitalen Geländemodellen
1.7.1 Begriffe
1.7.2 Modellierungsprozesse
1.7.3 Klassische Qualitätsmerkmale von DGM
2 Datenerfassung mittels Airborne Laser Scanning
2.1 Laser Scanner/
2.1.1 Laser Impuls
2.1.2 Ablenktechnologie
2.2 Positionierungs- und Orientierungssystem
2.2.1 Kinematisches DGPS
2.2.2 Inertiales Messsystem
2.2.3 Kombination der POS-Messgrössen
2.3 Vergleich der gebräuchlichsten ALS-Systeme
2.4 Unsicherheiten in der Datenerfassung
2.4. l Unsicherheit der Objekterfassung
2.4.2 Messunsicherheit in der Rangebestimmung
2.4.3 Messunsicherheit der Winkelbestimmung
2.4.4 Messunsicherheit der Positions- und Orientierungsbestimmung
2.4.5 Kombinierte Messunsicherheit
2.4.6 Anmerkung zur kombinierten Messunsicherheit
2.5 Bestimmung und Reduktion von systematischen Einflüssen
2.5. l Labor-Kalibrierung Laser Scanner
2.5.2 In situ Systemkalibrierung
2.5.3 Streifenausgleichung
2.6 Diskussion
3 Die ALS-Prozesskette
3.1 Produktspezifikation
3.2 Flugplanung
3.3 Flugvorbereitung und Systemkalibrierung
3.4 Befliegung 3.5 Berechnen der externen Orientierung
3.6 Prozessieren der Rohdaten
3.7 Filterung der Punkte
3.8 Modellbildung
3.9 Metadaten und Datenabgabe
3.10 Datensätze
3.10.1 Daten für die Planung und Vorbereitung der Arbeiten
3.10.2 Befliegung
3.10.3 Prozessieren der Rohdaten
3.10.4 Filterung der Punktwolke
3.10.5 Unterstützende Daten
3.10.6 Prozess-Aufzeichnungen
3.10.7 Qualitätskontrollen
3.11 Unsicherheiten in und aus den Prozessen
3.11.1 Umgang mit Ausreissern in der Rangebestimmung
3.11.2 Abweichungen und Fehler bei Terrain-Filterung
3.11.3 Unsicherheit aus der Modellierung
3.12 Diskussion
4 Qualitätsmodell für Airborne Laser Scanning
4.1 Aufbau des ALS-Qualitätsmodells
4.2 Nicht-quantitative Qualitätselemente
4.2.1 Allgemeine Produktdefinitionen für DGM
4.2.2 Definition des Produkts „DTM"
4.2.3 Definition des Produkts „DOM",
4.2.4 Nachvollziehbarkeit und Metadaten '
4.3 Quantitative Qualitätselemente (technischen Spezifikationen),
4.3.1 Auflösung
4.3.2 Räumliche Genauigkeit
4.3.3 Thematische Genauigkeit
4.3.4 Vollständigkeit
4.3.5 Zeitliche Genauigkeit
4.3.6 Logische Konsistenz
4.3.7 Vorschlag für technische Spezifikationen
4.4 Prozessqualität
4.5 Realisierungsprozesse
4.6 Managementprozesse
4.6.1 Projektmanagement
4.6.2 Kontinuierliche Verbesserung
4.6.3 Ausbildung und Training
4.6.4 Know-how Management
4.7 Qualitätsprüfung
4.7.1 Methoden der Qualitätsprüfungen
4.7.2 Kontrollen im Prozessablauf
4.7.3 Werkzeuge zur Qualitätskontrolle
4.7.4 Aufzeichnung der Qualitätsprüfung
4.8 Datenmanagement
4.9 Produktionssystem für ALS
4.9.1 Modul Qualitätssicherung und Visuelle Kontrolle
4.9.2 Modul Produktionsmonitoring
4.9.3 Modul Prozess-Manager
5 Analyse und Verbesserungsmöglichkeiten aus dem Projekt Landwirtschaftliche Nutzfläche
5.1 Einführung zum Projekt
5.2 Erarbeiten der Spezifikationen
5.3 Datenerfassung
5.3.1 Flugplanung
5.3.2 Schwierigkeiten in der Befliegung
5.3.3 Erkenntnisse aus der Datenerfassung im alpinen Raum
5.4 Prozessieren der Messwerte
5.4.1 Ableiten der Punktwolke aus den Messungen
5.4.2 Klassifizierung der Punkte
5.4.3 Ausbildung
5.4.4 ALS-Produktionssystem
5.5 Qualitätsmanagement
5.5.1 Kontrolle während der Befliegung
5.5.2 Kontrolle der Datenerfassung
5.5.3 Visuelle Kontrolle der Endprodukte
5.5.4 Resultate der quantitativen Qualitätsprüfungen
5.6 Diskussion der Erkenntnisse aus dem Projekt LWN
6 Schlussfolgerungen und Ausblick
6.1 Schlussfolgerungen
6.2 Ausblick
6.2.1 Monitoring des Scannens
6.2.2 Automatische Selektion der optimalen Punkte im Übeflappungsbereich
6.2.3 Filterung der Terrainpunkte
6.2.4 Echtzeit-DatenauswertungNuméro de notice : 13651 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : 10.3929/ethz-a-005396321 En ligne : http://dx.doi.org/10.3929/ethz-a-005396321 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62556 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 13651-01 35.20 Livre Centre de documentation Télédétection Disponible Investigations of high precision terrestrial laser scanning with emphasis on the development of a robust close-range 3D-laser scanning system / Hans Martin Zogg (2008)
![]()
Titre : Investigations of high precision terrestrial laser scanning with emphasis on the development of a robust close-range 3D-laser scanning system Type de document : Thèse/HDR Auteurs : Hans Martin Zogg, Auteur Editeur : Zurich : Institut für Geodäsie und Photogrammetrie IGP - ETH Année de publication : 2008 Collection : IGP Mitteilungen, ISSN 0252-9335 num. 098 Importance : 171 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-906467-78-8 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] acquisition d'images
[Termes IGN] données localisées 3D
[Termes IGN] étalonnage d'instrument
[Termes IGN] lever souterrain
[Termes IGN] modélisation géométrique de prise de vue
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] semis de points
[Termes IGN] télémètre laser terrestre
[Termes IGN] télémétrie laser terrestreIndex. décimale : 35.11 Géométrie et qualité des prises de vues Résumé : (Auteur) In recent years, numerous measurement systems and techniques have become available on the market for three-dimensional (3D) surveying of objects. Largely due to the increasing need of 3D-data, fast area-wide 3D-measurement methods are in high demand. In the world of surveying and the field of engineering geodesy, terrestrial laser scanning has been established as a newer measurement method for fast, area-wide SD-surveying. Terrestrial laser scanners measure distances and angles to objects without any contact. The actual geometry information of the scanned object has to be derived from a resulting 3D-point cloud in post-processing.
After the initial hype of terrestrial laser scanning, a slight disillusionment set in. Projects were not profitable or failed due to insufficient knowledge about laser scanning technology and its specifics. In addition, the hardware and software products available on the market often do not meet the requirements of specific applications. Thus, the selection of convenient applications for a particular terrestrial laser scanning system, the sensitivity in terms of environmental conditions, or the extensive post-processing of laser scanning data are just a few of the difficulties in using laser scanning technology. As a result, terrestrial laser scanning is rarely used for projects in engineering geodesy. Even though terrestrial laser scanning offers great potential, new fields of application have yet to be investigated.
This thesis originated from a project addressing the development of a qualified measurement system based on terrestrial laser scanning for the surveying of underground utility caverns in the field of water and sewage engineering. There was no convenient measurement system available on the market when the project started in 2005. There are three main objectives of this thesis: the development of a cost-efficient robust close-range 3D-laser scanning system largely for surveying underground utility caverns, the calibrations and investigations of terrestrial laser scanners with focus on the newly developed measurement system, and the development of new fields of application for terrestrial laser scanning. Moreover, this thesis contributes to the area of terrestrial laser scanning by offering better knowledge on its integration into engineering geodesy.
For the hardware development, the 2D-laser scanner SICK LMS200-30106 by Sick AG was selected and implemented as a distance measurement unit measuring distances and angles. This unit is well known and established in industrial applications and in the field of robotics. In addition, all components that were used for the close-range 3D-laser scanning system were selected according to predefined requirements. These requirements were strongly related to the application of the measurement of underground utility caverns. Furthermore, this thesis shows that an appropriate calibration of the close-range 3D-laser scanning system - the distance measurement unit specifically - allows its application in the field of engineering geodesy. Thus, appropriate calibration routines were developed, and intensive additional investigations of the measurement systems enabled the verification of the measurement accuracy and performance.
The close-range terrestrial 3D-laser scanner ZLS07 resulted from the development of a 3D-measurement system based on the terrestrial laser scanning technology. The ZLS07 is a robust and reliable measurement system that fulfils the requirements focused on surveying of underground utility caverns. Its specific limitations lie in the measurement range, accuracy, and angular resolution. However, the ZLS07 has been successfully established as a new measurement instrument at the surveying department of the city of Zurich. In addition to the hardware developments, an approach for automatic geometry modelling from 3D-point clouds was developed, tested, and discussed for post-processing 3D-point clouds of underground utility caverns. Furthermore, the ZLS07 was successfully used in other applications, such as the damage detection of an incinerator or the reverse engineering of technical constructions.Note de contenu : 1 Introduction
1.1 Motivation
1.2 Aims of the Thesis.
1.3 Outline
2 High Precision Terrestrial Laser Scanning
2.1 Terrestrial Laser Scanning in Engineering Geodesy
2.2 Specifications of Terrestrial Laser Scanners
2.3 The Measurement System "Terrestrial Laser Scanner"
2.4 Applications of Terrestrial Laser Scanning.
2.5 Remarks.
3 Development of Terrestrial Laser Scanner ZLS07
3.1 Requirements
3.2 Components of the ZLS07
3.3 Configuration of Terrestrial Laser Scanner ZLS07
3.4 Measurement Coordinate Systems
3.5 Software
3.6 Result of a Scan
3.7 Discussion
4 Calibration of Terrestrial Laser Scanner ZLSO 7
4.1 Calibration of Geodetic Sensors
4.2 Distance Measurement Unit
4.3 Errors of Axes
4.4 Synchronisation of Rotation Table and Distance Measurement Unit
4.5 Review
5 Validation of Terrestrial Laser Scanner ZLS07
5.1 Angle Measurement System
5.2 Wobbling of Vertical Axis
5.3 3D-Measurement Quality
5.4 Review
6 Acquisition of Underground Utility Caverns
6.1 Overview
6.2 ZLS07 for Acquisition of Underground Utility Caverns
6.3 Data Post-Processing Workflow
6.4 Review
7 Automatic Geometry Modelling
7.1 Data Modelling Requirements
7.2 Previous Work
7.3 Development of an Approach for Automatic Cavern Detection
7.4 Results
7.5 Review
8 Various Applications for Terrestrial Laser Scanner ZLS07
8.1 Damage Detection of an Incinerator
8.2 Reverse Engineering at the Overflow Construction of Nalps Dam (CH).
8.3 Review
9 Summary
9.1 Conclusions
9.2 Outlook
References
A Appendix
A. 1 Rotation Table ETH Zurich.
A.2 Software
A.3 Fourier-SeriesNuméro de notice : 15459 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère DOI : 10.3929/ethz-a-005679006 En ligne : http://dx.doi.org/10.3929/ethz-a-005679006 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62725 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15459-01 35.11 Livre Centre de documentation En réserve M-103 Disponible A method for automated registration of unorganised point clouds / K. Bae in ISPRS Journal of photogrammetry and remote sensing, vol 63 n° 1 (January - February 2008)
Permalinkvol 63 n° 1 - January - February 2008 - Terrestrial laser scanning (Bulletin de ISPRS Journal of photogrammetry and remote sensing) / Derek D. Lichti
PermalinkPermalinkImportant considerations for cranofacial mapping using laser scanners / Z. Majid in Photogrammetric record, vol 22 n° 120 (December 2007 - February 2008)
PermalinkOrthophoto generation from unorganized point clouds / L. Tournas in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 11 (November 2007)
PermalinkLaser scanning and archaeology: standard tools for 3D documentation of excavations / W. Neubauer in GIM international, vol 21 n° 10 (October 2007)
PermalinkPhotogrammetry and GIS in Turkey: improving heritage documentation / A. Cabuk in GIM international, vol 21 n° 9 (September 2007)
PermalinkPermalinkPermalinkPermalink