Landwirtschaftliche Fakultät: Auflistung Landwirtschaftliche Fakultät nach Publikationstyp "doc-type:article"
Anzeige der Dokumente 1-20 von 43
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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. ... -
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 ... -
COVID-19 and changes in global agri-food trade
Engemann, Helena; Jafari, Yaghoob (2022-04-09)COVID-19 has raised questions about the resilience of agri-food trade to global shocks to the system. This paper analyses the changes in agri-food trade (values, extensive and intensive margin, and diversification) during ... -
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 ... -
Differences among domestic chicken breeds in tonic immobility responses as a measure of fearfulness
Tiemann, Inga; Becker, Senta; Fournier, Jocelyn; Damiran, Daalkhaijav; Büscher, Wolfgang; Hillemacher, Sonja (2023-04-04)Background: One priority for animal welfare is for animals to experience less fear, especially during human contact. For domestic animals, breeds that are less fearful may provide genetic resources to develop strains with ... -
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 ... -
Evaluations of agri-environmental schemes based on observational farm data: The importance of covariate selection
Uehleke, Reinhard; Petrick, Martin; Hüttel, Silke (2022-01-13)Evaluations of agri-environmental schemes (AES) based on observational farm data generally use a matching algorithm for comparing participating and non-participating farms. To mitigate the potential post-matching covariate ... -
Exploring animal genetic resources of the domestic chicken and their behavior in the open field
Tiemann, Inga; Becker, Senta; Büscher, Wolfgang; Meuser, Verena (2022-02-04)Animal welfare is of general interest, and in the farming arena, efforts have increased to create optimal conditions for poultry production. Detailed and standardized studies on specific behavioral issues, such as fear, ... -
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 ... -
Glucocorticoids in relation to behavior, morphology, and physiology as proxy indicators for the assessment of animal welfare: A systematic mapping review
Tiemann, Inga; Fijn, Lisa; Bagaria, Marc; Langen, Esther; van der Staay, F. Josef; Arndt, Saskia; Leenaars, Cathalijn; Goerlich, Vivian (2023-01-06)Translating theoretical concepts of animal welfare into quantitative assessment protocols is an ongoing challenge. Glucocorticoids (GCs) are frequently used as physiological measure in welfare assessment. The interpretation ... -
Heating Performance and Ammonia Removal of a Single-Stage Bioscrubber Pilot Plant with Integrated Heat Exchanger under Field Conditions
Krommweh, Manuel S.; Deeken, Hauke F.; Licharz, Hannah; Büscher, Wolfgang (2021-10-10)In this study, biological exhaust air treatment was combined with a recuperative heat exchanger in one process stage. The aim of this plant development and testing is not only to reduce ammonia from the exhaust air of pig ... -
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 ...