Gottfried Mandlburger
YOU?
Author Swipe
View article: GNSS-based Time synchronisation of Stereo Images
GNSS-based Time synchronisation of Stereo Images Open
Achieving precise synchronization in stereo photogrammetry is essential for accurately reconstructing dynamic scenes. A setup was developed that consists of two Sony ILX-LR1 cameras synchronously triggered using accurate timing provided by…
View article: Enhancing bathymetric LiDAR by applying fractal dimensions to signal processing
Enhancing bathymetric LiDAR by applying fractal dimensions to signal processing Open
Fractal dimension is a statistical index of complexity to characterize geometries. It is commonly used in signal processing in different fields of research. There, observations of dynamic systems can be translated into numerical values all…
View article: High-precision geo-referencing of UAS data with robotic total stations
High-precision geo-referencing of UAS data with robotic total stations Open
Robotic Total Stations (RTS) allow the measurement of 3D positions of kinematic targets with high accuracy. They find wide applications for geo-referencing multisensor systems, but little focus has been put on the geo-referencing of Unmann…
View article: Airborne and UAV-borne Laser Bathymetry applied to a mountain river reach
Airborne and UAV-borne Laser Bathymetry applied to a mountain river reach Open
Mapping mountain river bathymetry poses significant challenges due to low flow depths, variable bed topography, and whitewater rapids, which hinder most survey techniques. This study explores the use of airborne and Unmanned Aerial Vehicle…
View article: New Approaches in Photo-Bathymetry
New Approaches in Photo-Bathymetry Open
Stereo-Photogrammetric measurements under water with a camera placed outside the water requires modelling refraction. In the case of a wavy, non-stationary natural water surface, this spatio-temporal modelling may become rather complex. Th…
View article: Evaluation of ULS Bathymetry for Hydrodynamic Modelling
Evaluation of ULS Bathymetry for Hydrodynamic Modelling Open
The importance of accurate and reliable DTMs are paramount for hydrodynamic modelling. Currently, bathymetry is either not considered or a simpler mathematical representation of the river is created from observed cross sections for hydrody…
View article: Exploring the Potential of Refractive NeRFs for Photogrammetric Bathymetry - First Application to UAV-based Data from the Pielach River
Exploring the Potential of Refractive NeRFs for Photogrammetric Bathymetry - First Application to UAV-based Data from the Pielach River Open
Accurate 3D reconstruction of underwater environments from above-water photos remains challenging due to refractive distortion at air-water interfaces. This contribution presents the first application of NeRFrac (Zhan et al., 2023) to UAV-…
View article: Combining imaging sonar and photogrammetry for underwater object localization and mapping
Combining imaging sonar and photogrammetry for underwater object localization and mapping Open
During the flooding event in September 2024 in Austria, an unknown number of industrial barrels was washed into a freshwater pond near Loosdorf, leading to this study aimed at locating and measuring these barrels. Due to significant turbid…
View article: Optical hydrography for seasonal and flood-induced changes in aquatic vegetation
Optical hydrography for seasonal and flood-induced changes in aquatic vegetation Open
The increasing occurrence of extreme weather events has a far reaching impact on all types of ecosystems. This includes submerged ecosystems, where floods and droughts influence the flora and fauna. Monitoring such submerged landscapes and…
View article: Detection and documentation of a submerged neolithic pile dwelling settlement using airborne laser bathymetry and multimedia photogrammetry - A case study at lake Mondsee
Detection and documentation of a submerged neolithic pile dwelling settlement using airborne laser bathymetry and multimedia photogrammetry - A case study at lake Mondsee Open
This study presents a comparative analysis of airborne laser bathymetry (ALB) and multimedia photogrammetry for the detection and documentation of a submerged Neolithic pile dwelling settlement in Lake Mondsee, Austria. High-resolution ALB…
View article: Simulation and validation of underwater scenes for two-media optical 3D reconstruction
Simulation and validation of underwater scenes for two-media optical 3D reconstruction Open
Optical 3D reconstruction in environments with complex light paths such as water-air surface interactions continues to be challenging, particularly due to the inherent refraction effects. These effects compromise assumptions taken in stand…
View article: Accurate reference for shallow water bathymetry using a tilt-compensating dual-prism pole and time-synchronized robotic total stations
Accurate reference for shallow water bathymetry using a tilt-compensating dual-prism pole and time-synchronized robotic total stations Open
Accurate and reliable reference data are key elements for advancing remote sensing techniques and validating the quality of geo data. This includes remote sensing methods for bathymetric data collection, such as SONAR or bathymetric LiDAR.…
View article: Analysis of refraction aware Neural Radiance Fields for 3D reconstruction of through the water scenes
Analysis of refraction aware Neural Radiance Fields for 3D reconstruction of through the water scenes Open
Neural Radiance Fields (NeRFs) synthesize novel views based on images acquired from different camera positions to represent 3D scenes. However, since they assume linear light paths, they are unsuitable for underwater environments where ref…
View article: A Review on UAS Trajectory Estimation Using Decentralized Multi-Sensor Systems Based on Robotic Total Stations
A Review on UAS Trajectory Estimation Using Decentralized Multi-Sensor Systems Based on Robotic Total Stations Open
In our contribution, we conduct a thematic literature review on trajectory estimation using a decentralized multi-sensor system based on robotic total stations (RTS) with a focus on unmanned aerial system (UAS) platforms. While RTS are com…
View article: Lab experiment for simultaneous reconstruction of water surface and bottom with a synchronized camera rig
Lab experiment for simultaneous reconstruction of water surface and bottom with a synchronized camera rig Open
Photo bathymetry is the use of photogrammetry for the reconstruction of the underwater topography. The imaging systems are located above water and the optical rays go through two different media, air and water, which means the rays are ref…
View article: Potential of airborne LiDAR in geomorphology - a technological perspective
Potential of airborne LiDAR in geomorphology - a technological perspective Open
(1) Christian Doppler Laboratory for Spatial Data from Laser Scanning and Remote Sensing, Institute of Photogrammetry and Remote Sensing, Vienna University of Technology, Austria ([email protected]), (2) International Institute for Geo-I…
View article: Change detection of riverbed movements using river cross-sections and LiDAR data
Change detection of riverbed movements using river cross-sections and LiDAR data Open
(1) Institute of Photogrammetry and Remote Sensing, Vienna University of Technology, Vienna , Austria ([email protected], [email protected]), (2) Centre for Water Resources, Vienna University of Technology, Vienna , Austria, (3) Depart…
View article: Macrophyte detection with bathymetric LiDAR – Applications of high-dimensional data analysis for submerged ecosystems
Macrophyte detection with bathymetric LiDAR – Applications of high-dimensional data analysis for submerged ecosystems Open
Automatic detection and classification of point clouds is a research topic of wide interest, as manual annotation of individual points is time consuming and inefficient for large surveys. This also holds for the emerging field of submerged…
View article: Strip Adjustment of Multi-Temporal LiDAR Data—A Case Study at the Pielach River
Strip Adjustment of Multi-Temporal LiDAR Data—A Case Study at the Pielach River Open
With LiDAR (Light Detection and Ranging) time series being used for various applications, the optimal realization of a common geodetic datum over many epochs is a highly important prerequisite with a direct impact on the accuracy and relia…
View article: A flexible trajectory estimation methodology for kinematic laser scanning
A flexible trajectory estimation methodology for kinematic laser scanning Open
Kinematic laser scanning is a widely-used surveying technique based on light detection and ranging (LiDAR) that enables efficient data acquisition by mounting the laser scanner on a moving platform. In order to obtain a georeferenced point…
View article: Strip Adjustment of Multi-Temporal LiDAR Data - A Case Study at the Pielach River
Strip Adjustment of Multi-Temporal LiDAR Data - A Case Study at the Pielach River Open
With LiDAR (Light Detection and Ranging) time series being used for various applications, optimal realisation of a common geodetic datum over many epochs is a highly important prerequisite with direct impact on accuracy and reliability of …
View article: Automatic Classification of Submerged Macrophytes at Lake Constance Using Laser Bathymetry Point Clouds
Automatic Classification of Submerged Macrophytes at Lake Constance Using Laser Bathymetry Point Clouds Open
Submerged aquatic vegetation, also referred to as submerged macrophytes, provides important habitats and serves as a significant ecological indicator for assessing the condition of water bodies and for gaining insights into the impacts of …
View article: Evaluation of Active and Passive UAV-Based Surveying Systems for Eulittoral Zone Mapping
Evaluation of Active and Passive UAV-Based Surveying Systems for Eulittoral Zone Mapping Open
The eulittoral zone, which alternates between being exposed and submerged, presents a challenge for high-resolution characterization. Normally, its mapping is divided between low and high water levels, where each calls for a different type…
View article: High-detail and low-cost underwater inspection of large-scale hydropower dams
High-detail and low-cost underwater inspection of large-scale hydropower dams Open
The article presents a practical method that combines low-cost camera systems with remotely operated vehicles (ROVs) to accomplish a comprehensive but economically feasible underwater survey of large hydropower infrastructures. Typically, …
View article: Multimedia Photogrammetry with non-planar Water Surfaces – Accuracy Analysis on Simulation Basis
Multimedia Photogrammetry with non-planar Water Surfaces – Accuracy Analysis on Simulation Basis Open
If multimedia-photogrammetry is used for the generation of point clouds of submerged objects or of the water bottom, Snell’s law has to be considered. When the images are taken from air, image rays are refracted at the air-water interface.…
View article: Under and Through Water Datasets for Geospatial Studies: the 2023 ISPRS Scientific Initiative “NAUTILUS”
Under and Through Water Datasets for Geospatial Studies: the 2023 ISPRS Scientific Initiative “NAUTILUS” Open
Benchmark datasets have become increasingly widespread in the scientific community as a method of comparison, validation, and improvement of theories and techniques thanks to more affordable means for sharing. While this especially holds f…
View article: Automatic Classification of Submerged Macrophytes at Lake Constance from Laser Bathymetry Point Clouds
Automatic Classification of Submerged Macrophytes at Lake Constance from Laser Bathymetry Point Clouds Open
Submerged aquatic vegetation, also referred to as submerged macrophytes, provides important habitats and serves as a significant ecological indicator for assessing the condition of water bodies and for gaining insights into the impacts of …