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distancemètreSynonyme(s)télémètre électronique appareil electronique de mesurage de distances |
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Geodetic distance meter : le géodimètre a 50 ans / J. Smith in XYZ, n° 72 (juin - août 1997)
[article]
Titre : Geodetic distance meter : le géodimètre a 50 ans Type de document : Article/Communication Auteurs : J. Smith, Auteur ; Olivier Reis, Traducteur Année de publication : 1997 Article en page(s) : pp 40 - 41 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] GeodimeterNuméro de notice : A1997-029 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=25885
in XYZ > n° 72 (juin - août 1997) . - pp 40 - 41[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 112-97031 RAB Revue Centre de documentation En réserve L003 Disponible Présentation du LAREG au Groupe Géodésie du CST et aux Journées de la Recherche, Marne-la-Vallée, 11 mars 1997 / Claude Boucher (1997)
Titre : Présentation du LAREG au Groupe Géodésie du CST et aux Journées de la Recherche, Marne-la-Vallée, 11 mars 1997 Type de document : Article/Communication Auteurs : Claude Boucher , Éditeur scientifique Editeur : Paris : Institut Géographique National - IGN (1940-2007) Année de publication : 1997 Collection : Publications du LAREG Sous-collection : Communications Conférence : Journées Recherche de l'IGN 1997 11/03/1997 13/03/1997 Champs-sur-Marne France Importance : 60 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Antarctique
[Termes IGN] DORIS
[Termes IGN] géoïde local
[Termes IGN] Global Navigation Satellite System
[Termes IGN] Global Orbitography Navigation Satellite System
[Termes IGN] GPS en mode cinématique
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] Jason
[Termes IGN] niveau moyen des mers
[Termes IGN] Nouvelle-Calédonie
[Termes IGN] Precise Range and Range Rate Equipment
[Termes IGN] réseau géodésique permanent
[Termes IGN] système de référence géodésiqueNuméro de notice : 18048 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Conférence invitée Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34845 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18048-01 CG.97 Livre Centre de documentation Congrès Disponible Entwicklung eines Meßsystems zur automatischen polaren Objekterfassung am Beispiel der Bauaufnahme / P. Buchmann (1996)
Titre : Entwicklung eines Meßsystems zur automatischen polaren Objekterfassung am Beispiel der Bauaufnahme Titre original : [Mise au point d'un système de mesures pour la saisie automatique d'objets polaires, par exemple les photographies de bâtiments] Type de document : Thèse/HDR Auteurs : P. Buchmann, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1996 Collection : DGK - C Sous-collection : Dissertationen num. 456 Importance : 84 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9499-4 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] données localisées 3D
[Termes IGN] tachéomètre électronique
[Termes IGN] télémètre laser terrestre
[Termes IGN] théodolite motoriséIndex. décimale : 35.20 Traitement d'image Résumé : (Auteur) In architecture the demand for plans is constantly increasing. However, in more than half the cases complete or correct plans are not available. The geometry of a building has therefore to be determined by surveying. The classical techniques in geodesy consist in observing discrete points where the object is represented by specially selected points.
An effective surveying method is presented here of scanning the object. The measuring sensor of the scanningsystem is an automatic tacheometer which consists of a motorized theodolite with an integrated reflectorless measuring laser ranging device. In order to realize the scanning method the tacheometer has to be controlled by a PC. In 1992, at the outset of these considerations, no instrument with the characteristics necessary for automatic surveying was available. Therefore, a prototype had to be constructed.
As horizontal and vertical intersections of the objects are generally required, steeringalgorithms have been developed to measure these profiles directly but completely independent of the position of the instrument. Adapted to the local object structure, the position of the profileplane and the space between the points to be scanned are determined before the system is started. The coordinates of each objectpoint are precalculated from the positions of the previously scanned points of the profileline. The horizontal direction and vertical angle of the tacheometer are set by the servo drives and the slope distance is measured. - The result of the measuring process are three-dimensional coordinates of all scanned points, which are situated in the profileplane.
The obvious problem is, that corners and edges can not be measured directly. They have to be derived by intersecting the straight lines belonging to the adjacent parts of the profileline. - To determine the surface-structure of an object an optional number of parallel profilelines is scanned. As a result, the 3D-geometry of an arbitrary surface is described by a dense grid of points. Practical examples for scanning objects are given.
Generally speaking, the accuracy of the measuring results depends on several factors. Systematic deviations in connection with the reflectorless distance measuring are of importance here. There are two different causes: the range finder needs two lenses, one to emit and one to receive the signal, and the target point of the distance measuring beam is not defined exactly. So special instrumental errors must be taken into consideration when measuring reflectorlessly with a tacheometer. The deviations caused by the parallactic angle, the eccentricity of the reference axis for the distance measuring and the axis error of the same reference axis are treated in detail.Numéro de notice : 28035 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63382 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28035-01 35.20 Livre Centre de documentation Télédétection Disponible Entwicklung und Erprobung eines abbildenden Laseraltimeters für den Flugeinsatz unter Verwendung des Mehrfrequenz- Phasenvergleichsverfahrens / C. Hug (1996)
Titre : Entwicklung und Erprobung eines abbildenden Laseraltimeters für den Flugeinsatz unter Verwendung des Mehrfrequenz- Phasenvergleichsverfahrens Titre original : [Élaboration et expérimentation d'un altimètre laser pour l'intervention en vol en utilisant des procédés multifréquence-phases différentes] Type de document : Thèse/HDR Auteurs : C. Hug, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1996 Collection : DGK - C Sous-collection : Dissertationen num. 457 Importance : 122 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9500-7 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] altimètre laser
[Termes IGN] faisceau laser
[Termes IGN] lasergrammétrie
[Termes IGN] phase
[Termes IGN] télémètre laser aéroporté
[Termes IGN] télémétrie laser aéroportéIndex. décimale : 35.10 Acquisition d'images Résumé : (Auteur)This paper investigates the usefulness of the principle of multi-frequency sidetone ranging for three-dimensional airborne terrain survey. The potential and the limits for scanning laser altimeters using this ranging scheme are discussed. An experimental setup is described, which was realised to study the behaviour of the ranging principle under real-world conditions. The results of laboratory and flight tests are presented and evaluated.
In sidetone ranging, the distance between the sensor and a target is determined by measuring the phases shift of sinus-oidal signals (sidetones) modulating a continuous laser beam, after having been reflected by a remote surface. Range measurements with a very high resolution can readily be realised this way at high measurement rates. Multiple frequen-cies are used to provide a large unambiguous range.
Due to the high resolution and accuracy potential, of this ranging method, it seemed a promising idea to implement it into an airborne sensor for 3-D terrain survey. A highly collimated monoscopic ranging beam combined with the high sampling rates and the high range resolutions allow 3-D surface mapping in great detail. Additionally, surface reflectance can easily be derived from the sidetone amplitudes in the return signal, which are independent of foreign illumination.
An experimental scanning laser altimeter setup suitable for airborne tests was realised. Its key components are a laser diode, which is amplitude modulated by two sidetone frequencies, and a rotating mirror which deflects the ranging beam conically at 10 Hz. Range and reflectance are sampled at 7.5 kHz. At an altitude of 500 m above ground, the surface is sampled within a swath of 170 m with a sample point diameter of 0.5 m, and distances between neighbouring samples are 0.8 m across the direction of flight and at most 6 m along track. The maximum range was found to be 570 m with a range resolution between 0.03 m and 0.17 m . These values correspond well to values predicted by model calcu-lations.
The characteristic behaviour of the ranging scheme under real-world conditions was studied by comparing the data col-lected by the laser altimeter during a test flight, with a reference digital elevation model (DEM) generated from stcreophotogrammetrically evaluated aerial photos. The mean altitude difference between both data sets is 0.23 m with a standard deviation of 0.5 m. Significant altitude differences can only be observed at the edges of buildings and above vegetation. A detailed analysis reveals that the majority of deviations results from shadows in the aerial photos, causing no-data areas in the reference DEM. and occasional sensor misbehaviour at surface discontinuities.
The multi-frequency sidetone ranging scheme performed especially well in detecting continuous surface modulation with high accuracy. Also, the shapes and sizes of natural and artificial surface objects were captured precisely. Surprisingly, even in forested areas, ground and canopy points were discriminated well. The tests, however, also showed, that ranging to water surfaces is not possible. The combination of reflectance and elevation data turned out be useful to automatically distinguish between artificial and natural surface objects (e.g. houses and trees).
In conclusion, multi-frequency sidetone ranging can be considered well suited as a powerful ranging scheme for high-resolution scanning laser altimeters. It was successfully implemented in a functional sensor which, although experimen-tal, already proved competitive with commercial laser rangers of the same class, which operate on the pulse-time-of-flight ranging principle. In addition, the realised scanning laser altimeter co-registers surface reflectance simultaneously to range, which opens the field for new methods of automatic surface object classification.Numéro de notice : 28022 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63369 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28022-01 35.10 Livre Centre de documentation En réserve M-103 Disponible 28022-02 35.10 Livre Centre de documentation En réserve M-103 Disponible Entwicklung und Erprobung eines Positionierungssystems für den lokalen Anwendungsbereich / C. Ziegler (1996)
Titre : Entwicklung und Erprobung eines Positionierungssystems für den lokalen Anwendungsbereich Titre original : [Conception et expérimentation d'un système de positionnement pour une utilisation locale] Type de document : Thèse/HDR Auteurs : C. Ziegler, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1996 Collection : DGK - C Sous-collection : Dissertationen num. 446 Importance : 98 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9489-5 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie
[Termes IGN] distancemètre
[Termes IGN] étalonnage d'instrument
[Termes IGN] test de performance
[Termes IGN] trilatérationIndex. décimale : 30.03 Instruments de géodésie Numéro de notice : 28043 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63390 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28043-01 30.03 Livre Centre de documentation En réserve M-103 Disponible 28043-02 30.03 Livre Centre de documentation En réserve M-103 Disponible Entwicklung eines Meßsystems zur Ermittlung von Turbulenzparametern der Atmosphäre für Anwendungen in der Geodäsie / Maria Hennes (1995)PermalinkJournées de recherche 1995 LOEMI / Laboratoire d'opto-electronique et de micro-informatique (1985 - 2016) (1995)PermalinkEarth oriented space research at Delft University of technology / B.A. Ambrosius (1994)PermalinkLe Géomensor CR 204 / S. Devaux (1994)PermalinkObservation results / R. Konttinen (1994)PermalinkProceedings of the first international airborne remote sensing, 1. Tome 1 / Environmental research institute of Michigan (1994)PermalinkProceedings of the first international airborne remote sensing, 2. Tome 2 / Environmental research institute of Michigan (1994)PermalinkProceedings of the first international airborne remote sensing, 3. Tome 3 / Environmental research institute of Michigan (1994)PermalinkGeodetic observations on the Pasmajarvi postglacial fault / Aimo Kiviniemi (1992)PermalinkPermalink