Thomas Wunderlich

• Dr.-Ing. habil.
• Ful at Technical University of Munich

Precise localization of semantic segmentation is attracting increasing attention, and salient performances are dominated by deep learning-based methods, especially deep convolutional neural networks (DCNNs). However, the outputs from the final layer of DCNNs are not sufficiently localized for accurate object boundaries due to their invariance prope...

Building Information Modeling (BIM) is a superb initiative to improve planning, construction and operation of structures and hence to avoid multiple databases and design errors by cooperative and standardized construction planning using Industry Foundation Classes (IFC). This holds for structural engineering with the main dimension of buildings in...

Due to ongoing geological processes and climate change, the risk of landslides and rockfalls in the Alpine region is omnipresent. One spectacular case study concerns the Mt. Hochvogel (2,592 m a.s.l.) on the German border to Austria, which is literally breaking apart. The TUM Chair of Geodesy does extensive deformation measurements on the summit, w...

In the paper at hand a new method for structural monitoring using scanning total stations is presented, enabling to forego the cumbersome signaling of target points but still detect significant movements in the millimeter range. In contrast to the existing scanning-based strategies of deformation analysis, this approach is based on creating reprodu...

Back in 2005, first experiments at the Sedrun attack of Gotthard base tunnel showed the applicability of autocollimation and IMU units to contribute as an independent measurement technique for orientation transfer down to deep shafts. Since then, evaluation strategies have been refined and in 2017 another project at the Semmering base tunnel was st...

Image Assisted Total Stations (IATS) unify geodetic precision of total stations with image and video capturing. An appropriate system calibration provided, these images and video frames are accurately geo-referenced at any time. They are particularly suitable for deformation monitoring of civil engineering structures and geo-risk areas, which are v...

Lasertracker sind als industrielles Messwerkzeug nicht mehr wegzudenken. Neben der hochgenauen Einzelpunkterfassung können zusätzlich auch die sechs Freiheitskrade (6DoF) von Messwerkzeugen erfasst werden. D.h. es wird nicht nur die 3D Position, sondern auch die Raumlage des Messwerkzeugs ermittelt. Dieses Messprinzip kann kostengünstig auch mit mo...

Eine moderne bildunterstütze Totalstation (Image Assisted Total Station - IATS) kann zur relativen Höhenübertragung mit nahezu gleichwertiger Genauigkeit wie ein digitales Nivellier eingesetzt werden. Dies ist möglich, wenn anstelle der klassischen automatischen Erfassung von Prismen, das Teleskop-Kamerabild einer digitale Barcode-Latte aufgenommen...

The technique of Image Assisted Total Stations (IATS) has been studied for over ten years and is composed of two major parts: one is the calibration procedure which combines the relationship between the camera system and the theodolite system; the other is the automatic target detection on the image by various methods of photogrammetry or computer...

Moderne bildunterstütze Totalstationen (Image Assisted Total Stations – IATS) können zur relativen Höhenübertragung mit nahezu gleicher Genauigkeit wie digitale Nivelliere eingesetzt werden. Dies ist möglich, wenn anstelle der klassischen automatischen Erfassung von Prismen das Teleskopkamerabild einer digitale Barcode-Latte aufgenommen und analysi...

Areal measurements, like laser scans or camera images, are more and more frequently used for deformation monitoring. Each single acquisition method has its advantages and disadvantages in detecting displacements, however. In dense point clouds of laser scan, distance changes in line of sight are easy to identify. In contrast, high-resolution image...

Based on data acquired by a single total station of a landslide area in the Bavarian Alps, three different analyzing concepts are described and evaluated. These methods use images, point clouds, and a fused approach of both data types

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...

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. For calibrating a terrestrial laser scanner, a functional calibration model needs to be set up. This functional calibration model...

Image Assisted Total Stations (IATS) unify the geodetic precision of total stations with the areal coverage of images. One or more cameras integrated in total stations deliver accurately geo-referenced and oriented images, an appropriate calibration provided. In combination with image processing and recognition techniques as well as the polar metho...

It is possible to use modern total stations for leveling applications. Using digital staffs for relative height transfer gets a higher precision than using automatic target recognition (ATR) for prism detection. The study at hand describes the implementation to automatically read and analyze the code pattern of a digital leveling staff using an Ima...

In the recent past geodetic hardware has developed rapidly. In particular, total stations, being one of the major data acquisition tools for geometric information, were equipped with several kinds of additional sensors which enable new measurement approaches for geo-monitoring projects. The implementation of camera chips and the scanning capability...

The technique of Image Assisted Total Stations (IATS) has been studied for over ten years and is composed of two major parts: one is the calibration procedure which combines the relationship between the camera system and the theodolite system; the other is the automatic target detection on the image by various methods of photogrammetry or computer...

The automatic co-registration of point clouds, representing three-dimensional (3D) surfaces, is an important technique in 3D reconstruction and is widely applied in many different disciplines. An alternative approach is proposed here that estimates the transformation parameters of one or more 3D search surfaces with respect to a 3D template surface...

With the development of Image Assisted Total Stations, some original calibration methods which were tested on prototypes can be improved for new instruments. This paper proposes an improved calibration method in telescope camera of total station MS50. Coded Targets are detected automatically with the help of open source library OpenCV. With enough...

This paper presents a comparison of two approaches for orientation transfer originating from different physical principles which have been tested under laboratory conditions simultaneously. In Part 1 fundamentals and reference values of the mechanical gyro method and the INS autocollimation method are described. The INS autocollimation method devel...

Target identification is an important process in terrestrial laser scanner (TLS) measurements; however, due to strong competition between manufacturers, the design of laser scanners is kept secret and is usually strengthened by accompanying proprietary software. Moreover, the target identification algorithms (i.e. definitions of the target centre)...

In course of the alpEWAS ( = alpine Early Warning System) research project a cost-effective landslide monitoring and early warning system has been developed between 2007 and 2010. The core of the project has been the development and testing of the three innovative, economically and continuously working measurement systems time domain reflectometry...

Zum Standard einer modernen Totalstation gehört mittlerweile die Unterstützung durch Bild- bzw. Videoinformation. In diesem Beitrag werden – beginnend mit dem selbstzielenden Theodolit – verschiedene Entwicklungen gezeigt, die dazu den Anstoß gegeben haben. Anhand kommerzieller Produkte, sowie Prototypen aus Forschungseinrichtungen wird der Weg von...

This paper presents the results of an investigation about a mobile low-cost dual-DGPS system fo r the fast tracing of the basic road design elements (horizontal plan, long section and cross sections). It is based on the use of GPS/ GNSS technology and the requirements set by the " Safety Criterion III " of vehicle movement dynamics introduced by th...

Built-in cameras are nowadays standard in modern total stations, but their possible potential of photogrammetric evaluation and analysis is not yet used. This article describes a research project for bridge monitoring using such an instrument at the Fatih Sultan Mehmet Bridge in Istanbul. By image processing algorithms an active LED target is detec...

The necessity for monitoring geo-risk areas such as rock slides is growing due to the increasing probability of such events caused by environmental change. Life with threat becomes to a calculable risk by geodetic deformation monitoring. An in-depth monitoring concept with modern measurement technologies allows the estimation of the hazard potentia...

The development of efficient and cost-effective landslide monitoring techniques is the central aim of the alpEWAS research project (www.alpewas.de). Within the scope of the project a terrestrial geosensor network on a landslide site in the Bavarian Alps has been set up, consisting of low cost GNSS with subcentimeter precision, time domain reflectom...

Modern electronic tacheometers offer the possibility to capture kinematic processes in real time. In case when the kinematic process is observed with only one measurement system, we have no possibility to perform redundant observations that would enable the accuracy estimation of observations and computed values. The Kalman filter represents a meth...

Mainly in the context of global climate change the awareness of landslide hazards has risen considerably in most mountainous regions worldwide in the last years. National and regional hazard mapping programs were set up in many countries and most of the potentially endangered sites have been identified. Although exclusive geodetic and geotechnical...

In this paper, an experimental procedure for a low-cost, fast, robust and relatively accurate verification method of the geometrical characteristics of a constructed road is described. The system, designed and operated by the Laboratory of Geodesy and Geomatics, Department of Civil Engineering, Aristotle University of Thessaloniki, aims at the docu...

In context of global climate change and the continuous extension of settlement areas in the Alps, especially due to tourism, an increasing conflict can be observed between land use and natural hazard prevention. This also includes deep‐seated landslides, which can cause considerable damage to settlements and infrastructure when they occur and even...

Gravel-bed dominated mountain streams are characterized by highly variable, short-term interaction between channel morphology and sediment transport. While a number of recently developed techniques, such as cosmogenic nuclide dating, thermochronology and geochronology of detrital minerals, are successfully utilized to quantify sediment transport an...

In context of global climate change and the continuous extension of settlement areas in the Alps especially due to tourism, an increasing conflict between land use and natural hazard prevention can be observed. This also includes deep seated landslides, which if activated can cause considerable damage to settlements and infrastructure and even can...

The purpose of this paper is to assess the efficiency of the linear Kalman filter as a method for the estimation of kinematic process observed with electronic tacheometer. On the assumption that the kinematic process is observed with only one measurement system there is no redundancy of the measurements. For evaluation of the unknown system state a...

Modern industrial production involves complex and time-critical process chains which demand a sophisticated supply chain management and logistics as well as safe and reliable transport systems. Inside a vast factory individual parts (e.g. engines) cover large distances by using specific transport lines, e.g. electric monorail suspension conveyors....

In 1999, a rockfall occurred at the Eiblschrofen, near Schwaz (Tyrol, Austria). Immediately after this event, a monitoring system consisting of GPS, geodetic and geotechnical sensors was installed in this area. The data of this different group of sensors are now for the first time analysed together within a hybrid assessment tool. This tool shall i...

Terrestrial Laser Scanning (TLS) is a very young but powerful tool for the three-dimensional digitalisation of large and complex objects or entire scenes. This innovation does not only replace existing techniques; it offers also new applications and potential for new solutions for new customers. In the beginning the actual situation of scanners and...

Durch die Anordnung eines zusätzlichen Fahrstreifens erhöhten sich die rechnerischen Beanspruchungen der Spannbetonbrücke über das Röslautal (B303). Das Tragwerk der 1995 fertig gestellten Brücke musste sowohl durch externe Vorspannung in Längsrichtung als auch durch in Schlitze eingelegte und verklebte CFK-Lamellen in Querrichtung im Jahr 2003 den...

This paper provides an economical geodetic method for damage recognition on a pre-stressed concrete bridge built in the sixties. Numerical models based on Finite Elements (FE) analyses have shown that for the affected object a complete surveying of the bottom surface is necessary. Based on reflectorless electronic distance measurement (R-EDM) and a...

SUMMARY In deep vertical shafts, it is not possible to use common engineering measurement techniques like e. g. traversing. Therefore the transfer of geodetic networks consists of the separate trans- fer of both the position and the bearing. Whereas the transfer of the position can be managed by mechanical or optical plumbs, the orientation of the...

Zusammenfassung: Am Münchner Olympiaturm sollte vom Lehrstuhl für Geodäsie das kinematische Verhalten des Drehrestaurants bestimmt werden. Da keine Befestigung von GPS-Antennen oder Reflektoren an der Außenfassade des Drehrestaurants möglich war, wurde zunächst bei Stillstand nachts ein Ringpolygon unterhalb des Drehrestaurants in einem 60 cm breit...

The successful use of precision farming technology for automated data acquisition, site specific farming, fleet management and field robots makes it necessary to have a detailed knowledge on the quality of all utilized equipment. To get knowledge on this quality is the aim of the presented investigation. Key technologies such as the positioning sys...

The new German high-speed rail track Koln-Rhein/Main is a significant step towards a modern vision of railway. On site, a set of reference points with distances of up to one km had to be created for Lot C, extending about 45 km from Hunfelden (south of Limburg) to Florsheim. The network was to be extended with traverse points. A measurement concept...

Completely new surveying systems available in geodesy and photogrammetry bring certain advantages as deliverance from mutual intervisibility of points, automatic target detection, quick evaluation of pictures and reliable real-time data transmission capabilities. -English summary

Conquering the enormous telecommunication tasks during the Olympic Games 1992 in Barcelona demanded for a capable TV-tower to be erected directly at the competition ground. The architect's concept of combining the technical function with a creative shape resulted in a toruslike antenna platform and a vertical gnomon acting as a giant sundial. Putti...

SUMMARY In 1999, a large rockfall occurred at the Eiblschrofen near Schwaz (Tyrol, Austria). Due to the imminent threat for the inhabitants, some geotechnical sensors were immediately installed at the top of the Eiblschrofen. Additionally, geodetic terrestrial and GPS measurements were started in that area. After some years of operation, a renewal...

SUMMARY Geodetic instruments providing prismless electronic distance measurement - like robot tacheometres and terrestrial laser scanners - show encouraging prospects concerning deformation measurements. Various periodic monitoring tasks to detect movements of constructive parts or of masses can be solved by such polar systems. Here different examp...

SUMMARY Planned structural alterations at the prominent glass dome of Munich's Palace of Justice demand a thorough structural analysis of its present and future behaviour. As the structure suffered damage during World War II its geometry does not completely correspond to the original design. So a precise as-built survey by terrestrial laser scannin...

Die Beurteilung bestehender Brücken hinsichtlich der weiteren Nutzung ge-winnt aufgrund des alternden Brückenbestands immer mehr an Bedeutung. Der Istzustand oder eine Bauwerksschädigung lassen sich meist jedoch nicht mit Standardmethoden bestimmen. Für die nachfolgend beschriebene Schä-digungsart, die bei der Spannbetonbrücke "Hochbrücke Freimann"...

Zugl.: Hannover, Univ., Habil.-Schr., 1993.