Wolfgang Wiedemann

• M. Sc.
• Technical University of Munich

Landslides represent a significant natural hazard with wide-reaching impacts. Addressing the challenge of accurately detecting and monitoring landslides, this research introduces a novel approach that combines feature tracking with histogram analysis for efficient outlier removal. Distinct from existing methods, our approach leverages advanced hist...

In diesem Beitrag werden zwei Ansätze für die hochgenaue Überwachung von Felsstürzen mittels terrestrischem Laserscanning vorgestellt. Beide Verfahren erzeugen aus den Punktwolken Einzelpunkte, die in allen Epochen eindeutig wiedergefunden werden können. Im ersten Verfahren geschieht dies auf Basis von Punktwolken-Patches, für die die Bewegung zwis...

Water dams are an important infrastructure component for energy generation, water supply and flood control. Regular inspections of the structures for damage and deformation are necessary for safe operation and to ensure stability. In addition to the traditional concepts of geodetic network measurement, laser scan data can be used to deliver areal i...

The classic pipeline of 3D point cloud registration involves two steps: point feature matching and the globally consistent refinement. We focus on the first step, which can be further divided into three parts: keypoint detection, feature descriptor extraction and pairwise-point correspondence estimation. In practical applications, point feature mat...

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...

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

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...

Mobile Mapping Systems (MMS) provide a quick and affordable way to capture spatial data of large areas. A suitable calibration of such a multi sensor system, consisting of at least an IMU, GNSS and profile scanner, ensures proper data acquisition. Determine the relative position and orientation of the invisible scanner plane represents a main issue...

Image Assisted Total Stations (IATS) unify geodetic precision of total stations with areal coverage of images. The concept of using two IATS devices for high-resolution, long-range stereo survey of georisk areas has been investigated in the EU-FP7 project DE-MONTES (www.de-montes.eu). The paper presents the used methodology and compares the main fe...