Katharina Anders

Katharina Anders
Universität Heidelberg · 3DGeo Research Group, Institute of Geography

PhD

About

67
Publications
18,211
Reads
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547
Citations
Citations since 2016
66 Research Items
546 Citations
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2016201720182019202020212022050100150200
2016201720182019202020212022050100150200

Publications

Publications (67)
Article
The recent, sharp increase in the availability of data captured by different sensors, combined with their considerable heterogeneity, poses a serious challenge for the effective and efficient processing of remotely sensed data. Such an increase in remote sensing and ancillary data sets, however, opens up the possibility of utilizing multimodal data...
Article
Full-text available
This paper investigates different methods for quantifying thaw subsidence using terrestrial laser scanning (TLS) point clouds. Thaw subsidence is a slow (mm‐cm per year) vertical displacement of the ground surface common in ice‐rich permafrost‐underlain landscapes. It is difficult to quantify thaw subsidence in tundra areas as they often lack stabl...
Article
Geographic observation benefits from the increasing availability of time series of 3D geospatial data, which allow analysis of change processes at high temporal detail and over extensive periods. In this context, the demand for advanced methods to detect and extract topographic surface changes from these 4D geospatial data emerges. Changes in natur...
Article
Full-text available
Extracting accumulation and erosion from near-continuous 3D observation of a natural scene is an important step in many geoscientific analyses. Change forms are typically detected and quantified via pairwise 3D surface changes. Surface increase or decrease with a duration over multiple acquisitions may not be detected if corresponding changes are s...
Article
Full-text available
Sandy coasts form the interface between land and sea and their morphologies are highly dynamic. A combination of human and natural forcing results in morphologic changes affecting both nature values and coastal safety. Terrestrial laser scanning (TLS) is a technique enabling near-continuous monitoring of the changing morphology of a sandy beach-dun...
Article
Full-text available
This dataset contains unoccupied aerial vehicle (UAV)-based photogrammetric point clouds, orthophotos, UAV-borne laser scanning point clouds, and terrestrial laser scanning point clouds of three nature reserves of the Sandhausen inland dunes in Baden-Württemberg, Germany: Pflege Schönau, Pferdstrieb Süd, and Zugmantel-Bandholz. The three surveyed a...
Poster
Full-text available
Die Beobachtung dynamischer Oberflächenänderungen in natürlichen Landschaftsszenen ist ein wichtiger Bestandteil von Umweltforschung und -anwendungen (z. B. Monitoring potenzieller Naturgefahren). Szenen können mittels terrestrischem Laserscanning (TLS) von einer fixen Position in zeitlich hoher Auflösung und über lange Zeiträume (z. B. stündlich ü...
Book
Full-text available
Sensing mountains by close-range and remote techniques is a challenging task. The 4th edition of the international Innsbruck Summer School of Alpine Research 2022 – Close-range Sensing Techniques in Alpine Terrain brings together early career and experienced scientists from technical-, geo- and environmental-related research fields. The interdiscip...
Conference Paper
Full-text available
The objective of this work is the development of an integrated monitoring service for the identification and evaluation of ground surface and slope movements in the context of coal mining, the prevention of natural hazards and protection of infrastructure. The focus is set on the integration of a long-range terrestrial laser scanner into a continuo...
Technical Report
Full-text available
Das Ziel dieses Projekts war die Integration von Wissen taiwanesischer und deutscher Wissenschaftler*innen in den Bereichen hochdetaillierte 3D-Raumerfassung und -analyse, Energieinitiativen und Veranstaltungen. Die ursprüngliche Umsetzung war in mehreren gemeinsamen Workshops und Feldexperimenten geplant, ebenso wie Software-Trainingsprogramme. Di...
Technical Report
Full-text available
Urban regions are particularly affected by increasing heat waves due to climate change. Vegetation, particularly trees, are an important factor to the local climate (i.e. microclimate) within cities. However, urban trees are subject to increasing heat stress during hot summers, which may impede their positive effects on the urban climate and – wors...
Article
Full-text available
Point clouds derived from UAV-borne laser scanning and UAV-borne photogrammetry provide new opportunities for 3D topographic monitoring in geographic research. The airborne acquisition strategy overcomes common challenges of ground-based techniques, such as limited spatial coverage or heterogeneous measurement distribution, and allows flexible repe...
Article
Full-text available
Automatic extraction of surface activity from near-continuous 3D time series is essential for geographic monitoring of natural scenes. Recent change analysis methods leverage the temporal domain to improve the detection in time and the spatial delineation of surface changes, which occur with highly variable spatial and temporal properties. 4D objec...
Conference Paper
Full-text available
We analyse surface change by using ULS and DIM point clouds of 2019 and 2021 as input for two state-of-the-art methods for pairwise surface change analysis: (1) The Multiscale Model to Model Cloud Comparison (M3C2) algorithm and (2) a recent M3C2-based approach (CD-PB M3C2) using plane correspondences to reduce the uncertainty of quantified change....
Conference Paper
Full-text available
Near-continuous time series of 3D point clouds capture local landscape dynamics at a large range of spatial and temporal scales. These data can be acquired by permanent terrestrial laser scanning (TLS) or time lapse photogrammetry, and are being used to monitor surface changes in a variety of natural scenes, including snow cover dynamics, rockfalls...
Conference Paper
Full-text available
Virtual Laser Scanning (VLS) provides a remote sensing method to generate 3D point clouds, which can, in certain cases, replace real data acquisition. A prerequisite is a suitable substitute of reality for modelling the 3D scene, the scanning system, the platform, the laser beam transmission, the beam-scene interaction, and the echo detection. The...
Article
Full-text available
Morphologies of highly complex star dunes are the result of aeolian dynamics in past and present times. These dynamics reflect climatic conditions and associated forces like sediment availability and vegetation cover as well as feedbacks with adjacent environments. However, an understanding of aeolian dynamics on star dune morphometries is still la...
Article
Full-text available
Virtual laser scanning (VLS) allows the generation of realistic point cloud data at a fraction of the costs required for real acquisitions. It also allows carrying out experiments that would not be feasible or even impossible in the real world, e.g., due to time constraints or when hardware does not exist. A critical part of a simulation is an adeq...
Article
Full-text available
Laser scanning point clouds of forest stands were acquired in southwest Germany in 2019 and 2020 from different platforms: an aircraft, an uncrewed aerial vehicle (UAV) and a ground-based tripod. The UAV-borne and airborne laser scanning campaigns cover twelve forest plots of approximately 1 ha. The plots are located in mixed central European fores...
Conference Paper
Full-text available
Virtual Laser Scanning (VLS) provides a remote sensing method to generate 3D point clouds, which can, in certain cases, replace real data acquisition. A prerequisite is a suitable substitute of reality for modelling the 3D scene, the scanning system, the platform, the laser beam transmission, the beam-scene interaction, and the echo detection. The...
Article
Full-text available
Topographic laser scanning is a remote sensing method to create detailed 3D point cloud representations of the Earth's surface. Since data acquisition is expensive, simulations can complement real data given certain premises are met: (i) models of 3D scene and scanner are available and (ii) modelling of the beam-scene interaction is simplified to a...
Preprint
Full-text available
4D topographic point cloud data contain information on surface change processes and their spatial and temporal characteristics, such as the duration, location, and extent of mass movements, e.g., rockfalls or debris flows. To automatically extract and analyse change and activity patterns from this data, methods considering the spatial and temporal...
Article
Full-text available
Urban regions are particularly affected by increasing heat waves due to climate change. Vegetation, particularly trees, are an important factor to the local climate (i.e. microclimate) within cities. However, urban trees are subject to increasing heat stress during hot summers, which may impede their positive effects on the urban climate and – wors...
Article
The analysis and interpretation of 3D topographic change requires methods that achieve low uncertainties in change quantification. Many recent geoscientific studies that perform point cloud-based topographic change analysis have used the Multiscale Model to Model Cloud Comparison (M3C2) algorithm to consider the associated uncertainty. Change measu...
Article
Full-text available
Virtual laser scanning (VLS), the simulation of laser scanning in a computer environment, is a useful tool for field campaign planning, acquisition optimisation, and development and sensitivity analyses of algorithms in various disciplines including forestry research. One key to meaningful VLS is a suitable 3D representation of the objects of inter...
Article
Full-text available
The analysis of topographic time series is often based on bitemporal change detection and quantification. For 3D point clouds, acquired using laser scanning or photogrammetry, random and systematic noise has to be separated from the signal of surface change by determining the minimum detectable change. To analyse geomorphic change in point cloud da...
Preprint
Full-text available
The increasing global driver of digitalization in both research and scientific education demands for new initiatives developing and offering of online teaching and e-learning content in various geographic domains. Pan-European collaborations make it possible to connect minds and build new innovative teaching and learning settings following open edu...
Article
Full-text available
Near-continuously acquired terrestrial laser scanning (TLS) data contains valuable information on natural surface dynamics. An important step in geographic analyses is to detect different types of changes that can be observed in a scene. For this, spatiotemporal segmentation is a time series-based method of surface change analysis that removes the...
Article
Point clouds continue to be acquired with greater accuracy and less occlusion over complex scenes, characterised by high roughness and topographic variation in all three dimensions. The most widely adopted approach to change detection, M3C2, measures change along the local surface normal, which varies between points and bypasses the uncertainties i...
Preprint
Full-text available
Topographic laser scanning is a remote sensing method to create detailed 3D point cloud representations of the Earth's surface. Since data acquisition is expensive, simulations can complement real data given certain premises are available: i) a model of 3D scene and scanner, ii) a model of the beam-scene interaction, simplified to a computationally...
Article
Full-text available
Topographic change at a given location usually results from multiple processes operating over different timescales. However, interpretations of surface change are often based upon single values of movement, measured over a specified time period or in a single direction. This work presents a method to help separate surface change types that occur at...
Article
Full-text available
The 3rd edition of the international summer school “Close-range Sensing Techniques in Alpine terrain” took place in Obergurgl, Austria, in June 2019. This article reports on results from the training and seminar activities and the outcome of student questionnaire survey. Comparison between the recent edition and the past edition in 2017 shows no si...
Article
Full-text available
Terrestrial laser scanners are commonly used for remotely sensing natural surfaces into 3D point clouds. Time series of such 3D point clouds can be analysed to gain information of surface changes that are induced by Earth surface shaping processes. The atomic unit in time series analysis is a bitemporal change detection and quantification. This sho...
Preprint
Full-text available
Topographic change at a given location usually results from multiple processes operating over different timescales. However, interpretations of surface change are often based upon single values of movement, measured over a specified time period and in a single direction. This work presents a method to help separate surface change mechanisms related...
Conference Paper
Full-text available
Zeitserien von 3D-Punktwolken werden zunehmend für die Beobachtung geomorphologischer Phänomene genutzt. Dieser Beitrag untersucht, wie eine veränderte zeit-liche Auflösung die raumzeitliche Abgrenzung von Oberflächenprozessen beeinflusst. Dazu wird eine Zeitserien-basierte Region Growing Segmentierung verwendet. Die Untersuchung erfolgt am Beispie...
Conference Paper
Full-text available
Aussagen über die Signifikanz von quantifizierten Änderungswerten bei multitemporalen Analysen von 3D-Laserscandaten basieren typischerweise auf statistischen Tests. Um aus Sensor-und Prozessierungsfehlern auf ein lokales "Level of Detection", also eine minimale quantifizierbare Änderung zu schließen, kann das allgemeine Kovarianzfortpflanzungsgese...
Code
This dataset comprises the source code to reproduce the 3D micro-mapping tool for plane adjustment at subsidence stations. In this project, users adjust a plane (height and orientation) at the positions of fixed poles, so-called subsidence stations, to provide information on the ground surface in 3D point clouds. The web-based tool was used to quan...
Article
Full-text available
Time series of topographic data are becoming increasingly widespread for monitoring geomorphic activity. Dense 3D time series are now obtained by near-continuous terrestrial laser scanning (TLS) installations, which acquire data at high frequency (e.g. hourly) and over long periods. Such datasets contain valuable information on topographic evolutio...
Chapter
Full-text available
Abstract: High-resolution 3D time series data of the surface can be used to analyze spatiotemporal morphologic changes of the snow cover. For this, a time series of the snow cover below the UFS was acquired hourly over several days with a terrestrial laser scanner. Using this dataset, a statistical method is developed for morphological change analy...
Article
The circum-Arctic transitional zone between forest and tundra, i.e. the treeline zone, is shifting northward due to current Arctic warming and, therefore, requires systematic monitoring. Up to now, radar remote sensing was hardly possible in the treeline zone due to spatial resolution and/or temporal decorrelation constraints of preceding satellite...
Article
Change analysis of rock glaciers is crucial to analyzing the adaptation of surface and subsurface processes to changing environmental conditions at different timescales because rock glaciers are considered as potentially unstable slopes and solid water reservoirs. To quantify surface change in complex surface topographies with varying surface orien...
Conference Paper
Full-text available
Geomorphic processes occur spatially variable and at varying magnitudes, frequencies and velocities, which poses a great challenge to current methods of topographic change analysis. For the quantification of surface change, permanent terrestrial laser scanning (TLS) can generate time series of 3D point clouds at high temporal and spatial resolution...
Conference Paper
Full-text available
3D point clouds acquired by laser scanning and other techniques are difficult to interpret because of their irregular structure. To make sense of this data and to allow for the derivation of useful information, a segmentation of the points in groups, units, or classes fit for the specific use case is required. In this paper, we present a non-end-to...
Conference Paper
Full-text available
Complex mega dune forms (esp. star dunes), representing the surface expression of highly multivariate systems, are still poorly investigated and understood. Yet their shape and sedimentological record display aeolian dynamics in past and present times, for example wind dynamics, sediment availability, sediment supply, as well as moisture and vegeta...
Article
Full-text available
Most of the world's permafrost is located in the Arctic, where its frozen organic carbon content makes it a potentially important influence on the global climate system. The Arctic climate appears to be changing more rapidly than the lower latitudes, but observational data density in the region is low. Permafrost thaw and carbon release into the at...
Conference Paper
Full-text available
Complex mega dune forms (esp. star dunes), representing the surface expression of highly multivariate systems, are still poorly investigated and understood. Yet their shape and sedimentological record display aeolian dynamics in past and present times, for example wind dynamics, sediment availability, sediment supply, as well as moisture and vegeta...
Preprint
Full-text available
The sharp and recent increase in the availability of data captured by different sensors combined with their considerably heterogeneous natures poses a serious challenge for the effective and efficient processing of remotely sensed data. Such an increase in remote sensing and ancillary datasets, however, opens up the possibility of utilizing multimo...
Article
Full-text available
The airborne laser scanning (ALS) datasets were acquired at the Arctic tundra site of Trail Valley Creek (TVC), Northwest Territories, Canada, which is underlain by continuous permafrost. Basic processing and filtering steps were applied to the ALS point cloud. Based on a classification into ground and vegetation points, a Digital Terrain Model (DT...
Article
Full-text available
Most of the world's permafrost is located in the Arctic, where its frozen organic carbon con-tent makes it a potentially important influence on the global climate system. The Arctic climate appears to be changing more rapidly than the lower latitudes, but observational data density in the region is low. Permafrost thaw and carbon release into the a...
Article
This paper presents (1) an automated method to extract planes and their spatial orientation directly from 3D point clouds, followed by (2) extensive validation tests accompanied by thorough statistical analysis, and (3) a fracture intensity calculation on automatically segmented planes. For the plane extraction, a region growing segmentation algori...
Poster
Full-text available
The high-latitude forest-tundra transitional zone is a region which is highly vulnerable to the current Arctic warming. The local changes accompanying expected northward migration of the treeline requires systematic monitoring. We focus on an area in the east of the Mackenzie Delta in Northwest Territories, Canada, which is characterised by patches...
Article
Full-text available
OPEN ACCESS DATA PUBLICATION The datasets were acquired at the Arctic tundra site of Trail Valley Creek (TVC), Northwest Territories, Canada, which is underlain by continuous permafrost. With the objective to quantify thaw/freeze dynamics of the ground over time, the two study sites (about 50x50 m each) were repeatedly captured in June 2015, Augus...
Presentation
Three-dimensional data acquired by terrestrial laser scanning (TLS) provides an accurate representation of the Earth’s surface, which is commonly used to detect and quantify topographic changes on a small scale. However, in Arctic permafrost regions TLS-based monitoring of thaw subsidence is challenging due to vegetation and the micro-topographic c...
Article
Full-text available
Information about the 3D structure of understory vegetation is of high relevance in forestry research and management (e.g., for complete biomass estimations). However, it has been hardly investigated systematically with state-of-the-art methods such as static terrestrial laser scanning (TLS) or laser scanning from unmanned aerial vehicle platforms...