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Auteur Daniel Schröder |
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Virtual laser scanning of dynamic scenes created from real 4D topographic point cloud data / Lukas Winiwarter in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, vol V-2-2022 (2022 edition)
[article]
Titre : Virtual laser scanning of dynamic scenes created from real 4D topographic point cloud data Type de document : Article/Communication Auteurs : Lukas Winiwarter, Auteur ; Katharina Anders, Auteur ; Daniel Schröder, Auteur ; Bernhard Höfle, Auteur Année de publication : 2022 Article en page(s) : pp 79 - 86 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie
[Termes IGN] détection de changement
[Termes IGN] données lidar
[Termes IGN] données localisées 3D
[Termes IGN] filtre de Kalman
[Termes IGN] modèle de simulation
[Termes IGN] scène 3D
[Termes IGN] scène virtuelle
[Termes IGN] semis de points
[Termes IGN] Tyrol (Autriche)Résumé : (autuer) Virtual laser scanning (VLS) allows the generation of realistic point cloud data at a fraction of the costs required for real acquisitions. It also allows carrying out experiments that would not be feasible or even impossible in the real world, e.g., due to time constraints or when hardware does not exist. A critical part of a simulation is an adequate substitution of reality. In the case of VLS, this concerns the scanner, the laser-object interaction, and the scene. In this contribution, we present a method to recreate a realistic dynamic scene, where the surface changes over time. We first apply change detection and quantification on a real dataset of an erosion-affected high-mountain slope in Tyrol, Austria, acquired with permanent terrestrial laser scanning (TLS). Then, we model and extract the time series of a single change form, and transfer it to a virtual model scene. The benefit of such a transfer is that no physical modelling of the change processes is required. In our example, we use a Kalman filter with subsequent clustering to extract a set of erosion rills from a time series of high-resolution TLS data. The change magnitudes quantified at the locations of these rills are then transferred to a triangular mesh, representing the virtual scene. Subsequently, we apply VLS to investigate the detectability of such erosion rills from airborne laser scanning at multiple subsequent points in time. This enables us to test if, e.g., a certain flying altitude is appropriate in a disaster response setting for the detection of areas exposed to immediate danger. To ensure a successful transfer, the spatial resolution and the accuracy of the input dataset are much higher than the accuracy and resolution that are being simulated. Furthermore, the investigated change form is detected as significant in the input data. We, therefore, conclude the model of the dynamic scene derived from real TLS data to be an appropriate substitution for reality. Numéro de notice : A2022-437 Affiliation des auteurs : non IGN Thématique : IMAGERIE/INFORMATIQUE Nature : Article DOI : 10.5194/isprs-annals-V-2-2022-79-2022 Date de publication en ligne : 17/05/2022 En ligne : https://doi.org/10.5194/isprs-annals-V-2-2022-79-2022 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=100746
in ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences > vol V-2-2022 (2022 edition) . - pp 79 - 86[article]Genauigkeitsanalyse inertialer Vermessungssysteme mit fahrzeugfesten Sensoren / Daniel Schröder (1992)
Titre : Genauigkeitsanalyse inertialer Vermessungssysteme mit fahrzeugfesten Sensoren Titre original : [Analyse de la précision d'un système de mesure inertiel avec des capteurs de robot] Type de document : Thèse/HDR Auteurs : Daniel Schröder, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1992 Collection : DGK - C Sous-collection : Dissertationen num. 391 Importance : 148 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9437-6 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] accéléromètre
[Termes IGN] centrale inertielle
[Termes IGN] état de l'art
[Termes IGN] gyromètre
[Termes IGN] lever inertielIndex. décimale : 30.64 GPS et centrales inertielles Résumé : (Auteur) Analysis of the Accuracy of Strapdown Inertial Surveying Systems Within this thesis different quantities effecting the accuracy of geodetic positioning by means of an inertial strapdown-system are analysed. The inertial sensors are the starting point of the theoretical analysis. Detailed models of a pendulous accelerometer, a rate integrating gyro and a ringlasergyro are introduced and discussed as examples of the method of the mathematical modelling. The transformations between the reference frames, which have to be realized for the implementation of the model equation of inertial positioning, are discussed with regard to today's state-of-the-art sensor technology. To obtain an overview of the behaviour of the solutions of the differential equations simplified as result of the above-mentioned discussion, the stability of the linearized equations are analysed, using analytical as well as numerical methods. Nevertheless, in the case at hand of a time-variable system, only restricted statements based on the linearized equations are possible. Hence in the extensive simulations carried out the nonlinear model equations were used. In particular, the effect of different sensor parameters on position and orientation are simulated for trajectories of different dynamics. For adapting the course and the dynamics of the trajectories, observed data is used. Furthermore, the results obtained using a simple compensation algorithm are presented. Finally, the appendix contains a detailed representation of the nonlinear and linear system equations for different parametrisations of both the translation and the rotation. Numéro de notice : 28083 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63430 Réservation
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