Publikationen: Browsing Publikationen by Title
Now showing items 5-24 of 29
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Biased and unbiased estimates based on laser scans of surfaces with unknown deformations
Holst, Christoph; Artz, Thomas; Kuhlmann, Heiner (2014-10-02)The estimates based on laser scans of surfaces with unknown deformations are biased and not reproducible when changing the scanning geometry. While the existence of a bias is only disadvantageous at some applications, ... -
Calibration of Terrestrial Laser Scanners: Kalibrierung terrestrischer Laserscanner
Holst, Christoph; Neuner, Hans; Wieser, Andreas; Wunderlich, Thomas; Kuhlmann, Heiner (2016)The calibration of a laser scanner is necessary to reduce systematic errors in the acquired point cloud. Furthermore, calibrating laser scanners is motivated by the need of users to access up-to-date quality information. ... -
Can we model the effect of observed sea level rise on tides?
Schindelegger, Michael; Green, Mattias; Wilmes, Sophie-Berenice; Haigh, Ivan (2018-06-07)The link between secular changes in the lunar semidiurnal ocean tide (M2) and relative sea level rise is examined based on numerical tidal modeling and the analysis of long-term sea level records from Europe, Australia, ... -
Challenges and present fields of action at laser scanner based deformation analyses
Holst, Christoph; Kuhlmann, Heiner (2016-03-31)Due to improved laser scanning technology, laser scanner based deformation analyses are presently widespread. These deformation analyses are no longer based on individual points representing the deformation of an object ... -
Dealing with systematic laser scanner errors due to misalignment at area-based deformation analyses
Holst, Christoph; Medić, Tomislav; Kuhlmann, Heiner (2018-03-07)The ability to acquire rapid, dense and high quality 3D data has made terrestrial laser scanners (TLS) a desirable instrument for tasks demanding a high geometrical accuracy, such as geodetic deformation analyses. However, ... -
Development, Calibration and Evaluation of a Portable and Direct Georeferenced Laser Scanning System for Kinematic 3D Mapping
Heinz, Erik; Eling, Christian; Wieland, Markus; Klingbeil, Lasse; Kuhlmann, Heiner (2016-01-21)In recent years, kinematic laser scanning has become increasingly popular because it offers many benefits compared to static laser scanning. The advantages include both saving of time in the georeferencing and a more ... -
Direct Georeferencing for Portable Mapping Systems: In the Air and on the Ground
Klingbeil, Lasse; Eling, Christian; Heinz, Erik; Wieland, Markus (2017-11)During the last few years, the acquisition of geometric information about objects by using a moving sensor platform has gained increasing popularity in the surveying community. A large number of companies offer vehicle-based ... -
Empirical stochastic model of detected target centroids: Influence on registration and calibration of terrestrial laser scanners
Medić, Tomislav; Holst, Christoph; Janssen, Jannik; Kuhlmann, Heiner (2019-03-22)The target-based point cloud registration and calibration of terrestrial laser scanners (TLSs) are mathematically modeled and solved by the least-squares adjustment. However, usual stochastic models are simplified to a ... -
Estimation of Focal Length Variations of a 100-m Radio Telescope's Main Reflector by Laser Scanner Measurements
Holst, Christoph; Zeimetz, Philipp; Nothnagel, Axel; Schauerte, Wolfgang; Kuhlmann, Heiner (2012-08)Due to gravitation, the main reflector of a radio telescope underlies a deformation which causes a change in focal length depending on the variations of the elevation angle of the telescope. In order to estimate these ... -
Flächenhafte Deformationsanalysen mit terrestrischen und Nahbereichslaserscannern: eine Gegenüberstellung anhand von Beispielen
Holst, Christoph; Dupuis, Jan; Paulus, Stefan; Kuhlmann, Heiner (2014)Dieser Beitrag stellt einen Überblick über den Ablauf einer flächenhaften Deformationsanalyse basierend auf terrestrischen Laserscannern (TLS) dar, wobei speziell auf die Datenerfassung, Vorverarbeitung und Auswertung ... -
High-Precision Surface Inspection: Uncertainty Evaluation within an Accuracy Range of 15μm with Triangulation-based Laser Line Scanners
Dupuis, Jan; Kuhlmann, Heiner (2014-01-02)Triangulation-based range sensors, e.g. laser line scanners, are used for high-precision geometrical acquisition of free-form surfaces, for reverse engineering tasks or quality management. In contrast to classical tactile ... -
Impact of spatial correlations on the surface estimation based on terrestrial laser scanning
Jurek, Tobias; Kuhlmann, Heiner; Holst, Christoph (2017-07-19)In terms of high precision requested deformation analyses, evaluating laser scan data requires the exact knowledge of the functional and stochastic model. If this is not given, a parameter estimation leads to insufficient ... -
Improved area-based deformation analysis of a radio telescope’s main reflector based on terrestrial laser scanning
Holst, Christoph; Nothnagel, Axel; Blome, Martin; Becker, Philip; Eichborn, Malwin; Kuhlmann, Heiner (2015-03-14)The main reflectors of radio telescopes deform due to gravitation when changing their elevation angle. This can be analyzed by scanning the paraboloid surface with a terrestrial laser scanner and by determining focal length ... -
Investigations on the Influence of Antenna Near-field Effects and Satellite Obstruction on the Uncertainty of GNSS-based Distance Measurements
Zimmermann, Florian; Eling, Christian; Kuhlmann, Heiner (2016-03-31)Antenna near-field effects are one of the accuracy limiting factors on GNSS-based distance measurements. In order to analyse these influences, a measurement campaign at an EDM calibration baseline site with optimum GNSS ... -
Laser scanning based growth analysis of plants as a new challenge for deformation monitoring
Dupuis, Jan; Holst, Christoph; Kuhlmann, Heiner (2016-03-31)Nowadays, the areal deformation analysis has become an important task in engineering geodesy. Thereby, not only manmade objects are of high interest, also natural objects, like plant organs, are focused more frequently. ... -
Magnetic Field Sensor Calibration for Attitude Determination
Klingbeil, Lasse; Eling, Christian; Zimmermann, Florian; Kuhlmann, Heiner (2014-05-29)The presented work aims to give an overview of different calibration methods for magnetic field sensors, which are used for attitude determination. These methods are applicable in the field without any additional equipment. ... -
Management support by optimization-based trade-off analysis: the example of biodiesel crop production
Lautenbach, Sven; Volk, Martin; Strauch, Michael; Whittaker, Gerald; Seppelt, Ralf (2014)Modeling in decision support applications has often been used to compare outcomes between alternative scenarios of decision options. The introduction of optimization methods enable the comparison of a very large number of ... -
Modeling the Beam Deflection of a Gantry Crane under Load
Holst, Christoph; Burghof, Martin; Kuhlmann, Heiner (2014-02)Gantry cranes load and unload containers from container ships. To ensure safety and operation, the deflection of their main beams under load should be analyzed. This deflection depends on the weight of the loaded container ... -
Optimizing the Target-based Calibration Procedure of Terrestrial Laser Scanners: Optimierung des zielzeichenbasierten Kalibrierprozesses terrestrischer Laserscanner
Medić, Tomislav; Holst, Christoph; Kuhlmann, Heiner (2020)Terrestrial laser scanner (TLS) measurements suffer from systematic errors due to internal misalignments. The magnitude of the resulting errors in the point cloud exceeds the magnitude of random errors in many applications. ... -
Overview on Current Modelling Strategies of Point Clouds for Deformation Analysis: Überblick aktueller Methoden zur Modellierung von Punktwolken für die Deformationsanalyse
Neuner, Hans; Holst, Christoph; Kuhlmann, Heiner (2016)Terrestrial laser scanning was used for deformation monitoring of structures and geoscientific objects already at an early stage of its employment for engineering geodetic tasks. This paper gives an overview on current ...