Frank Neitzel

Frank Neitzel
  • Prof. Dr.-Ing.
  • Managing Director at Technische Universität Berlin

About

116
Publications
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1,527
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Introduction
Frank Neitzel works at the Institute of Geodesy and Geoinformation Science, Technische Universität Berlin. Frank does research in Geodesy and Adjustment Theory. One of his current projects is 'AN ALL-EMBRACING STOCHASTIC MODEL FOR TERRESTRIAL LASER SCANNERS.'
Current institution
Technische Universität Berlin
Current position
  • Managing Director
Additional affiliations
December 2010 - present
Technische Universität Berlin
Position
  • Managing Director

Publications

Publications (116)
Article
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Zusammenfassung: In diesem Beitrag wird die Ausgleichung angeschlossener Höhennetze besprochen. Obwohl es sich dabei um ein lineares Ausgleichungsproblem handelt, das direkt gelöst werden kann, finden sich in der Literatur oftmals Lösungen unter Einführung von Näherungswerten für die unbekannten Neupunkthöhen. Im Beitrag werden sowohl die direkte L...
Article
Bridges are one of the most important elements in the worldwide traffic infrastructure. Therefore, they require regular inspection and maintenance. In Germany, for instance, many bridges are older than 50 years, which means they need special treatment to keep them in service. One very promising concept for optimizing the maintenance of bridges is B...
Article
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Since the orbit repeat cycle of Galileo satellites is about 10 days, existing spatial–temporal repeatability-based station multipath mitigation methods such as the modified sidereal filtering (MSF) and the multipath hemispherical map need more than one week of data in order to model the Galileo phase multipath correction. From this perspective, the...
Article
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The Real-Time Global Navigation Satellite System (GNSS) Precise Positioning Service (RTPPS) is recognized as the most promising system by providing precise satellite orbit and clock corrections for users to achieve centimeter-level positioning with a stand-alone receiver in real-time. Although the products are available with high accuracy almost al...
Article
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The finite volume method (FVM), like the finite element method (FEM), is a numerical method for determining an approximate solution for partial differential equations. The derivation of the two methods is based on very different considerations, as they have historically evolved from two distinct engineering disciplines, namely solid mechanics and f...
Article
Context. Precise astrometric measurements performed on meteor images are required to derive the dynamical parameters of a mete-oroid. As a consequence, the measurements carried out in this initial step will have a strong impact on the dynamical solution of an orbiting meteoroid. These measurements relate to the position of the meteor defined by the...
Article
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In the absence of detailed surface information, empirical solar radiation pressure (SRP) models, such as the five-parameter Empirical CODE Orbit Model (ECOM1) and its extended version-ECOM2, are widely used for modeling SRP forces acting on GNSS satellites. This study shows that the orbits of BeiDou-3 Inclined Geosynchronous Orbit satellites (IGSOs...
Article
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In this contribution it is shown how an extended uncertainty budget of the observations according to the Guide to the Expression of Uncertainty in Measurement (GUM) can be considered in adjustment computations. The extended uncertainty budget results from the combination of Type A standard uncertainties determined with statistical methods and Type...
Article
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In a series of three articles, spline approximation is presented from a geodetic point of view. In part 1, an introduction to spline approximation of 2D curves was given and the basic methodology of spline approximation was demonstrated using splines constructed from ordinary polynomials. In this article (part 2), the notion of B-spline is explaine...
Article
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Suppose a large and dense point cloud of an object with complex geometry is available that can be approximated by a smooth univariate function. In general, for such point clouds the “best” approximation using the method of least squares is usually hard or sometimes even impossible to compute. In most cases, however, a “near-best” approximation is j...
Article
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To evaluate the benefit of a measurement procedure onto the estimated parameters, the dispersion of the parameters is usually used. To draw objective conclusions, unbiased or at least almost unbiased estimates are required. In geodesy, most of the functional relations are nonlinear but the statistical properties of the estimates are usually obtaine...
Book
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In geodesy and geoinformation science, as well as in many other technical disciplines, it is often not possible to directly determine the desired target quantities, for example, the 3D Cartesian coordinates of an object. Therefore, the unknown parameters must be linked with measured values, for instance, directions, angles, and distances, by a math...
Article
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In this contribution the fitting of a straight line to 3D point data is considered, with Cartesian coordinates x_i , y_i , z_i as observations subject to random errors. A direct solution for the case of equally weighted and uncorrelated coordinate components was already presented almost forty years ago. For more general weighting cases, iterative a...
Article
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Outlier detection is one of the most important tasks in the analysis of measured quantities to ensure reliable results. In recent years, a variety of multi-sensor platforms has become available, which allow autonomous and continuous acquisition of large quantities of heterogeneous observations. Because the probability that such data sets contain ou...
Article
By means of a small-scale truss bridge, the ability of the Measurement- and Model-based Structural Analysis to detect and localise damage was examined in [1]. Although there was no noteworthy difficulty in detecting damage, it turned out that damage localisation responds sensitively to systematic influences, i.e. non-modelled properties of the mech...
Article
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Global navigation satellite systems (GNSS) are an important tool for positioning, navigation, and timing (PNT) services. The fast and high-precision GNSS data processing relies on reliable integer ambiguity fixing, whose performance depends on phase bias estimation. However, the mathematic model of GNSS phase bias estimation encounters the rank-def...
Article
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Spline approximation, using both values yi and xi as observations, is of vital importance for engineering geodesy, e.g., for approximation of profiles measured with terrestrial laser scanners, because it enables the consideration of arbitrary dispersion matrices for the observations. In the special case of equally weighted and uncorrelated observat...
Article
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With the development of China’s BeiDou Navigation Satellite System (BDS) and the operation of the real-time service (RTS) of the International GNSS service, BDS real-time precise point positioning (RTPPP) has become possible. In this contribution, the RTS product CLK93 is employed for BDS RTPPP, and its quality for BDS orbit and clock corrections i...
Article
In multi-GNSS integration, fixing inter-system double-difference ambiguities to integers is still a challenge due to the existence of inter-system biases (ISB) when mixed types of GNSS receivers are used. It has been shown that when ISB is known, the inter-system ambiguities can be fixed and the reliability of ambiguity fixing can be improved signi...
Article
The Measurement- and Model-based Structural Analysis (MeMoS) integrates a finite element model into least squares adjustment and thus allows to evaluate a mechanical model and measurements in a combined analysis. To examine the capability to detect and localise damage using this integrated analysis MeMoS, a small-scale truss bridge made of aluminiu...
Article
Full-text available
Recent advances in stochastic modelling of reflectorless rangefinders revealed an inherent relationship among raw intensity values and the corresponding precision of observed distances. In order to derive the stochastic properties of a terrestrial laser scanner's (TLS) rangefinder, distances have to be observed repeatedly. For this, the TLS of inte...
Article
Full-text available
Recent advances in stochastic modelling of reflectorless rangefinders revealed an inherent relationship among raw intensity values and the corresponding precision of observed distances. In order to derive the stochastic properties of a terrestrial laser scanner’s (TLS) rangefinder, distances have to be observed repeatedly. For this, the TLS of inte...
Preprint
Recent advances in stochastic modelling of reflectorless rangefinders revealed an inherent relationship among raw intensity values and the corresponding precision of observed distances. In order to derive the stochastic properties of a terrestrial laser scanner’s (TLS) rangefinder, distances have to be observed repeatedly. For this, the TLS of inte...
Article
Full-text available
The carrier phase inter-frequency bias (IFB) of GLONASS between receivers of different types is usually not zero. This bias must be estimated and removed in data processing so that the integer double difference (DD) ambiguities can be fixed successfully. Recently, the particle filter approach has been proposed to estimate the IFB rate in real time....
Article
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Current research questions in the field of geomorphology focus on the impact of climate change on several processes subsequently causing natural hazards. Geodetic deformation measurements are a suitable tool to document such geomorphic mechanisms, e.g. by capturing a region of interest with terrestrial laser scanners which results in a so-called 3-...
Chapter
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Zusammenfassung Dieser Beitrag fokussiert auf die Überwachung einer historischen Brücke mittels terrestrischem Laserscanning während eines Belastungsversuchs. Dabei wurde ein Belastungsregime von etwa 1 bis 6 MN durchfahren. Zur Erfassung der statischen Haltephasen wurden 3-D-Laserscanner eingesetzt, welche die Verformung der Brücke infolge des Las...
Chapter
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Aus aktueller Sicht werden Methoden zur zerstörungsfreien Prüfung von Brückenbauwerken in der Zukunft eine wichtige Rolle spielen, um den Zustand der etlichen in die Jahre gekommenen Bauwerke zu beurteilen. Forschungsschwerpunkte in der Ingenieurgeodäsie und anderen Disziplinen sind hierbei flächenhafte Verfahren zur Erfassung und Analyse von Defor...
Article
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In engineering geodesy point clouds derived from terrestrial laser scanning or from photogrammetric approaches are almost never used as final results. For further processing and analysis a curve or surface approximation with a continuous mathematical function is required. In this paper the approximation of 2D curves by means of splines is treated....
Conference Paper
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In diesem Beitrag wird ein neues Verfahren zur gemeinsamen Segmentierung und Registrierung von Punktwolken vorgestellt, das die vorhandene Topologie von Einzel- scans zur Segmentierung nutzt und die daraus extrahierten Merkmale in Form von Ebenen als korrespondierende Informationen für eine Registrierung verwendet, wo- durch die Segmentierung ergän...
Article
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Precise Point Positioning (PPP) is a popular technology for precise applications based on the Global Navigation Satellite System (GNSS). Multi-GNSS combined PPP has become a hot topic in recent years with the development of multiple GNSSs. Meanwhile, with the operation of the real-time service (RTS) of the International GNSS Service (IGS) agency th...
Conference Paper
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Aktuelle Forschungsergebnisse zeigen für terrestrische Laserscanner (TLS) mit Strecken-messung nach dem Phasenvergleichsverfahren einen inhärenten Zusammenhang zwischen Signalstärke und Messrauschen. Diese Tatsache eignet sich somit zur Aufstellung von intensitätsbasierten stochastischen Modellen für TLS. Stochastische Modelle haben eine zentrale B...
Article
Relative positioning using multi-GNSS (global navigation satellite systems) can improve accuracy, reliability, and availability compared to the use of a single constellation system. Intra-system double-difference (DD) ambiguities (ISDDAs) refer to the DD ambiguities between satellites of a single constellation system and can be fixed to an integer...
Conference Paper
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Dieser Beitrag thematisiert die Nutzung von 3D-Punktwolken zum Monitoring von Infrastrukturbauwerken am Beispiel einer historischen Gewölbebrücke bei Verden (Aller). Zur Erfassung von 3D-Punktwolken kommen in diesem Projekt terrestrische Laserscanner zum Einsatz, die sich seit mehr als einer Dekade als effizientes Messsystem zur schnellen Erfassung...
Article
Full-text available
Current research questions in the field of geomorphology focus on the impact of climate change on several processes subsequently causing natural hazards. Geodetic deformation measurements are a suitable tool to document such geomorphic mechanisms, e.g. by capturing a region of interest with terrestrial laser scanners which results in a so-called 3-...
Article
Full-text available
Although double-differenced (DD) observations between satellites from different systems can be used in multi-GNSS relative positioning, the inter-system DD ambiguities cannot be fixed to integer because of the existence of the inter-system bias (ISB). Obviously, they can also be fixed as integer along with intra-system DD ambiguities if the associa...
Conference Paper
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In diesem Beitrag werden zunächst die Grundlagen und das Prinzip der digitalen Bildkorrelation kurz erläutert. Danach wird anhand von Bilddaten des zu untersuchenden Bauwerks gezeigt, mit welcher Genauigkeit sich Verschiebungsbeträge ermitteln lassen. Das Einsatzpotential der digitalen Bildkorrelation für die Untersuchung großmaßstäbiger Objekte wi...
Article
Up until now no appropriate models have been proposed that are capable to describe the stochastic characteristics of reflectorless rangefinders - the key component of terrestrial laser scanners. This state has to be rated as unsatisfactory especially from the perception of Geodesy where comprehensive knowledge about the precision of measurements is...
Conference Paper
Full-text available
Zusammenfassung: Bis zum heutigen Tage liegen keine aussagekräftigen Modelle vor, die das stochastische Verhalten von reflektorlos-arbeitenden Entfernungsmessern zutreffend beschreiben. Da diese jedoch die Schlüsselkomponente von terrestrischen Laserscannern (TLS) sind, ergibt sich die dringende Notwendigkeit, dieser Forschungsfrage nachzugehen. Di...
Conference Paper
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Zusammenfassung Aktuelle Forschungsfragen in der Glaziologie befassen sich mit den Auswirkungen des Klimawandels, die sich unter anderem durch den Rückzug von Gletschern zeigen und in Folge dessen Naturgefahren begünstigen. Um derartige Mechanismen besser verstehen zu können, eignet sich die geodätische Deformationsmessung, insbesondere unter Verwe...
Conference Paper
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In diesem Beitrag wird ein neues Verfahren zur Segmentierung von Punktwolken vorgestellt, das sich die durch die regelmäßige Abtastung eines terrestrischen Laserscanners resultierende Rasterdatenstruktur für die Ableitung von geometrischen und radiometrischen Eigenschaften zu Nutze macht. Der Segmentierungsalgorithmus ist durch die Anwendung effizi...
Chapter
Für eine umfassende Bauwerksüberwachung und für die experimentelle Tragsicherheitsbewertung von Baukonstruktionen kommen neben dem Monitoring von Durchbiegungen und Verschiebungen mit Hilfe geodätischer Überwachungsmessungen auch dynamische Analysen zum Einsatz, die unter anderem auf der Erfassung des Schwingungsverhaltens mit Hilfe von Beschleunig...
Conference Paper
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Trotz der enormen Popularität von terrestrischen Laserscannern findet die Standpunktwahl bisher zumeist intuitiv statt. In diesem Beitrag wird gezeigt, wie eine Standpunktwahl beim terrestrischen Laserscanning unter ökonomischen Gesichtspunkten und im Kontext der Ingenieurgeodäsie erfolgen kann. Die dazu erforderliche Simulation von TLS-Beobachtung...
Article
Full-text available
Terrestrial laser scanning today is frequently applied in practice for areal determination of structural deformations. However, approaches to rigorous deformation analysis and tests of significance are rare. Here we present the reasons and possible strategies to improve the situation. At first we examine the conditions where and when areal deformat...
Article
The case of a singular dispersion matrix within the Gauss–Helmert Model has been considered before, most recently even allowing the rank of BQ to be smaller than the rank of B. In this contribution the emphasis is shifted towards an illuminating example, the 2D Helmert transformation.
Chapter
Für eine umfassende Bauwerksüberwachung und für die experimentelle Tragsicherheitsbewertung von Baukonstruktionen kommen neben dem Monitoring von Durchbiegungen und Verschiebungen mit Hilfe geodätischer Überwachungsmessungen auch dynamische Analysen zum Einsatz, die unter anderem auf der Erfassung des Schwingungsverhaltens mit Hilfe von Beschleunig...
Presentation
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Slides based on the following article: Model based viewpoint planning for terrestrial laser scanning from an economic perspective
Article
Satellite deficiency degrades the performance of GPS single point positioning (SPP) in city urban areas. If the number of observed satellites is smaller than that of the unknown independent parameters in the data processing, extended Kalman filter (EKF) methods will usually be employed to transit the variable values epoch by epoch. In this case, th...
Conference Paper
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Despite the enormous popularity of terrestrial laser scanners in the field of Geodesy, economic aspects in the context of data acquisition are mostly considered intuitively. In contrast to established acquisition techniques, such as tacheometry and photogrammetry, optimisation of the acquisition configuration cannot be conducted based on assumed ob...
Article
Full-text available
The traditional way of solving non-linear least squares (LS) problems in Geodesy includes a linearization of the functional model and iterative solution of a nonlinear equation system. Direct solutions for a class of nonlinear adjustment problems have been presented by the mathematical community since the 1980s, based on total least squares (TLS) a...
Article
A current aim of ongoing research in the field of deformation measurement is to automatically determine geometric changes between several epochs with data captured by terrestrial laser scanners. A critical component within the process chain of deformation measurement is the transformation of captured point clouds into a reference coordinate system....
Article
Full-text available
Abstract: 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 techniques, such as tacheometry and classical photogrammetry, optimisation of the acquisition configuration cannot be condu...
Conference Paper
Full-text available
Jeder ingenieurgeodätischen Messkampagne geht in der Regel eine ausführliche Standpunktplanung voraus, die einerseits Aspekte der Wirtschaftlichkeit berücksichtigt und anderseits versucht, geforderte Genauigkeitskriterien zu erfüllen. Obwohl terrestrische Laserscanner (TLS)1 mittlerweile etablierte geodätische Instrumente sind, wurden die beiden zu...
Article
Abstract The case of a singular dispersion matrix within the Gauss-Helmert Model has been considered before, usually assuming a sufficiently small rank deficiency in order to guarantee a unique solution for both the residual vector as well as the estimated parameter vector of type Best Linear Uniformly Unbiased Estimate (BLUUE). In this contributio...
Chapter
The use of open GIS standards offers a broad variety of potential, particularly in the field of data exchange, data storage, and interoperability. GML and CityGML are excellent examples for the ontological description of real world objects by means of an open standard whereas SensorML serves to describe measurements, sensors and measuring platforms...
Conference Paper
The determination of material parameters from displacement field measurement is being examined for linear elastic solid. A frequently used approach to compute material constants can be found in many studies. Even though they presented the approach in many different variations, but in the end they are essentially based on the same algorithm: Paramet...
Article
Full-text available
GLONASS could hardly reach the positioning performance of GPS, especially for fast and real-time precise positioning. One of the reasons is the phase inter-frequency bias (IFB) at the receiver end prevents its integer ambiguity resolution. A number of studies were carried out to achieve the integer ambiguity resolution for GLONASS. Based on some of...
Conference Paper
Full-text available
Trotz der enormen Popularität von terrestrischen Laserscannern in den meisten Anwendungsgebieten der Geodäsie finden ökonomische Belange lediglich durch rein intuitive Überlegungen Berücksichtigung. Anders als bei den etablierten Messverfahren Tachymetrie und Photogrammetrie kann eine Optimierung der Aufnahmekonfiguration nicht auf Grundlage von Ob...
Conference Paper
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Die Verwendung offener Standards bietet eine Vielzahl von Möglichkei-ten, gerade im Bereich des Datenaustausches, Datenlagerung, aber auch der Interoperabili-tät. GML und CityGML sind hervorragende Beispiele für die Beschreibung von Realweltob-jekten mittels eines offenen Standards wohingegen SensorML dazu dient, Messungen, Senso-ren und Messplattf...
Article
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While the Errors-In-Variables (EIV) Model has been treated as a special case of the nonlinear Gauss- Helmert Model (GHM) for more than a century, it was only in 1980 that Golub and Van Loan showed how the Total Least-Squares (TLS) solution can be obtained from a certain minimum eigenvalue problem, assuming a particular relationship between the diag...
Conference Paper
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„Zeitreihenanalyse“ – dieses Stichwort schreckt leider immer noch viele Praktiker eher ab, als den Mehrwert aus den ohnehin vorliegenden Daten zu ziehen. Unter der Annahme, dass eine derartige Analyse eher etwas für den akademischen Bereich sei, verschenken viele Anwender das Potential, ihrem Auftraggeber mit geringem Aufwand wesentlich mehr Inform...
Conference Paper
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Beginning in 2000 annual terrestrial laser scanning has been applied at the very active rock glacier Hin-teres Langtalkar annually collecting the longest record of laser scanning in periglacial studies, at least in Europe. Despite the fact that independently measured 3D-movement reach magnitudes of up to 3.40 ma-1, inherent measurement uncertaintie...
Conference Paper
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Die Strukturüberwachung von Ingenieurbauwerken beruht heutzutage auf einer Auswertung räumlich und zeitlich verteilter hybrider Messungen, die z.B. mittels Tachymeter, Neigungssensoren, faseroptischen Sensoren (FOS), Dehnmessstreifen (DMS), GPS etc. erfasst werden. Für eine gemeinsame Auswertung müssen neue Methoden adaptiert werden, da diese, wie...
Article
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Das Ziel aktueller Forschungen zur Deformationsanalyse unter Verwendung terrestrischer Laserscanner (TLS) besteht darin, geometrische Veränderungen zwischen verschiedenen Messepochen automatisch zu erkennen. Als Schlüsselproblematik erweist sich dabei die Verknüpfung einzelner Punktwolken in ein gemeinsames Koordinatensystem, was bisher unter Verwe...
Conference Paper
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Die Merkblätter der Gesellschaft für Geodäsie, Geoinformation und Landma-nagement e.V., die sogenannten DVW-Merkblätter, sollen anerkannte Regeln der Technik in einem bestimmten Themenkomplex dokumentieren. Dabei kann es sich beispielsweise um konkrete Verfahrensanweisungen, um Best-Practice-Beispiele oder um Beschreibungen zur Nutzung einer neuen...
Conference Paper
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Deformation analysis based on multi-temporal Terrestrial Laser Scanning (TLS) surveys has been applied for many years in commercial and academic problem domains. Downsides of this technique are the sequential data acquisition as well as its limited accuracy compared to terrestrial InSAR or InRAR based technologies that are currently gaining attenti...
Conference Paper
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Terrestrial laser scanning (TLS) can be seen as an established method for geodetic data acquisition. Advantageous is its high achievable accuracy as well as its rapid, active and laminar sampling of the object space. However, problems occur if an object, the scanner itself or both are moving which is referred to as kinematic TLS (k-TLS). The cause...
Article
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Geodetic adjustment models are often set up in a way that the model parameters need to fulfil certain constraints. The normalized Lagrange multipliers have been used as a measure of the strength of constraint in such a way that if one of them exceeds in magnitude a certain threshold then the corresponding constraint is likely to be incompatible wit...
Conference Paper
Full-text available
In recent years, the Total Least-Squares adjustment within Errors-In- Variables models has been used frequently when estimating the parameters of certain coordinate transformations from empirical data. While the affine-transformation parameters could be solved efficiently in a multivariate setting, the similarity transformation required algorithms...
Article
Full-text available
One aim of this project was the determination of sensor positions on a ship by applying terrestrial laser scanning. Furthermore the outer shell of the vessel has been captured by digital imagery and processed to a 3D point cloud by using multi view stereo software namely Visual SfM and 123Dcatch. Finally the captured interior and exterior point clo...
Conference Paper
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Im Zuge einer gemeinsamen Arbeit wurden in einem Steinbruch Verformungsmessungen mit einem terrestrischen Laserscanner und einem terrestrischen Radarscanner durchgeführt. Anhand der Auswerteergebnisse werden die Vorteile und Grenzen der einzelnen Messsysteme aufgezeigt und eine Möglichkeit vorgestellt, die charakteristischen Eigenschaften beider Sy...
Conference Paper
Full-text available
A current aim of ongoing research is to automatically determine geometric changes between several epochs captured by terrestrial laser scanning. A critical component within the process chain of deformation monitoring is the transformation of subsequently captured point clouds into a reference respectively superior coordinate system. This step has u...
Article
Full-text available
Zusammenfassung Die ständige Überwachung von Bauwerken gewinnt zunehmend an Bedeutung. Mit Blick auf die Nachhaltigkeit ist die Verlängerung der Nutzungsdauer bestehender baulicher Konstruktionen von unschätzbarem Wert, sowohl aus finanziellen Gründen als auch unter Denkmalaspekten. Eine neue Methode zur Detektion von Strukturschädigungen basiert a...
Conference Paper
Full-text available
Structural failures like the I-35W Mississippi River Bridge collapse on the first of August in 2007 is besides a huge economic loss often associated with personal suffering and underlines yet again how quickly existing inspection and monitoring methods may fail. Engineering geodesy has always been providing an important contribution to monitoring a...
Article
Full-text available
Modifying Cadzow's algorithm to generate the optimal TLS-solution for the structured EIV-Model of a similarity transformation In 2005, Felus and Schaffrin discussed the problem of a Structured Errors-in-Variables (EIV) Model in the context of a parameter adjustment for a classical similarity transformation. Their proposal, however, to perform a Tot...
Conference Paper
Full-text available
Die ständige Überwachung von Konstruktionen während ihrer Lebenszeit ist eine bedeutsame Aufga-be, die Gegenstand vielzähliger Forschungsaktivitäten ist. Unter dem Aspekt der Nachhaltigkeit ist die Verlängerung der Nutzungsdauer bestehender Konstruktionen von unschätzbarem Wert, sowohl aus finanziellen Gründen als auch unter dem Gesichtspunkt der E...
Conference Paper
Full-text available
The detection of deviations plays a crucial role in quality assurance as well as in manufacturing processes where for instance differences between a CAD and the current state of an object have to be determined. Hence a problem that arises is the interpretation of the outcome which is displayed on a monitor in 2D. By combining a projector and 3D-mea...
Conference Paper
Full-text available
Structural failures like the I-35W Mississippi River Bridge collapse on the first of August in 2007 is besides a huge economic loss often associated with personal suffering and underlines yet again how quickly existing inspection and monitoring methods may fail. Engineering geodesy has always been providing an important contribution to the monitori...
Article
Full-text available
In diesem Beitrag wird gezeigt, wie mit geringem finanziellen Aufwand ein UAV-System aufgebaut werden kann. Die Komponenten des Systems, das Zubehör sowie die Software zur Steuerung werden vorgestellt. Die Planung und Durchführung eines Bildfluges mit dem UAV werden aufgezeigt. Ein zentraler Punkt in diesem Beitrag ist die Generierung von 3D-Punktw...
Conference Paper
Full-text available
In this contribution it is shown how an UAV system can be built at low costs. The components of the system, the equipment as well as the control software are presented. Furthermore an implemented programme for photogrammetric flight planning and its execution are described. The main focus of this contribution is on the generation of 3D point clouds...
Conference Paper
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Zusammenfassung Mobiles 3D-Indoor Mapping stellt eine neue Herausforderung insbesondere in den Berei-chen Robotik, Building Information Modelling (BIM) oder etwa der sicherheitstechnischen Überwachung von Gebäuden dar. Besonders die Positionierung und Orientierung der Sen-sorplattform während der dynamischen Messung birgt eine Vielzahl an Problemen...
Article
Full-text available
Traditional visual inspection tools, which are typically carried out annually, can only detect obvious damages like disruption, cracks or rust on the surface of bridges. Advanced non-destructive and destructive inspection tools are usually applied when visual inspection can’t provide sufficient information. Besides these techniques engineering surv...
Article
Full-text available
In this contribution it is shown that the so-called “total least-squares estimate” (TLS) within an errors-in-variables (EIV) model can be identified as a special case of the method of least-squares within the nonlinear Gauss–Helmert model. In contrast to the EIV-model, the nonlinear GH-model does not impose any restrictions on the form of functiona...
Conference Paper
Full-text available
Geodätische Arbeiten verfolgen das generelle Ziel, Teile der geometrisch-physikalischen Realität auf der Grundlage von Messungen zu beschreiben. Da es jedoch in fast allen Fällen nicht möglich ist, alle Parameter, die die geometrisch-physikalischen Verhältnisse beschreiben, direkt zu messen, muss ein funktionales Modell aufgestellt werden. Mit dies...
Article
Full-text available
Nach einer Einführung zum Einsatz des terrestrischen Laserscannings in der Deformationsmessung werden aktuelle Registrierungsverfahren kurz vorgestellt. In einer Laboruntersuchung wird dann das Genauigkeitspotenzial der eingesetzten Laserscanner hinsichtlich der Erkennung von Objektverschiebungen untersucht. Im Anschluss daran wird in einer weitere...
Conference Paper
Full-text available
Es wird gezeigt, dass sich motorisierte Tachymeter mit reflektorloser Entfernungsmessung für ein tachymetrisches Laserscanning einsetzen lassen. Dies wird anhand der Überwachung eines historischen Bauwerkes demonstriert. Die einzelnen Arbeitsschritte von der Festlegung aufzumessender Bauteile über die Instrumentenuntersuchung bis hin zur Auswertung...
Conference Paper
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Dem Einsatz und Betrieb von unbemannten autonomen Luftfahrzeugen als Träger bildgebender Sensoren kommt in der Datenerfassung aus der Luft eine immer größere Bedeutung zu. Dieser Beitrag gibt einen Überblick über die Entstehungsgeschichte von unbemannten Flugobjekten und beschreibt die rechtlichen Grundlagen für deren Betrieb. Aufbau, Betriebsart u...

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