Publikationen: Auflistung Publikationen nach Autor "Holst, Christoph"
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Accurate georeferencing of TLS point clouds with short GNSS observation durations even under challenging measurement conditions
Zimmermann, Florian; Holst, Christoph; Klingbeil, Lasse; Kuhlmann, Heiner (2018-08-29)The accuracy of georeferenced TLS point clouds is directly influenced by site-dependent GNSS effects, deteriorating the accuracy of the ground control point coordinate estimation. Especially under challenging GNSS ... -
Aiming at self-calibration of terrestrial laser scanners using only one single object and one single scan
Holst, Christoph; Kuhlmann, Heiner (2014-12-05)When using terrestrial laser scanners for high quality analyses, calibrating the laser scanner is crucial due to unavoidable misconstruction of the instrument leading to systematic errors. Consequently, the development of ... -
Automatic optimization of height network configurations for detection of surface deformations
Holst, Christoph; Eling, Christian; Kuhlmann, Heiner (2013-05-18)Levellings are performed to observe height changes of different epochs at discrete surveying points. A reliable estimation of surface deformations by a bivariate polynomial needs a sufficient configuration of the underlying ... -
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. ... -
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, ... -
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 ... -
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 ... -
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. ... -
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 ... -
Spatio-temporal Correlations of Terrestrial Laser Scanning: Raumzeitliche Korrelationen beim terrestrischen Laserscanning
Kauker, Stephanie; Holst, Christoph; Schwieger, Volker; Kuhlmann, Heiner; Schön, Steffen (2016)This contribution investigates correlations in terrestrial laser scanning on the scientific level. It summarizes recent approaches to model correlations, to develop measurement scenarios for the determination of correlations ... -
Survey Configuration for Terrestrial Laser Scanning: Aufnahmekonfiguration für Terrestrisches Laserscanning
Wujanz, Daniel; Holst, Christoph; Neitzel, Frank; Kuhlmann, Heiner; Niemeier, Wolfgang; Schwieger, Volker (2016)Despite the enormous popularity of terrestrial laser scanners in the field of geodesy and related sciences the vital task of viewpoint planning is mostly considered intuitively. In contrast to established acquisition ... -
Zum Einfluss der räumlichen Auflösung und verschiedener Qualitätsstufen auf die Modellierungsgenauigkeit einer Ebene beim terrestrischen Laserscanning: The Impact of Spatial Resolution and Different Quality Levels on the Modeling Accuracy of a Plane Using Terrestrial Laser Scanning
Heinz, Erik; Holst, Christoph; Kuhlmann, Heiner (2019)Terrestrische Laserscanner sind in der Lage, unsere Umgebung in Form von Punktwolken dreidimensional zu erfassen. Hierbei kann geräteintern in der Regel zwischen verschiedenen räumlichen Auflösungsstufen und auch ...