Volker Wichmann

Volker Wichmann
LASERDATA GmbH · R&D

Dr. rer. nat.

About

55
Publications
20,931
Reads
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2,571
Citations
Introduction
Volker Wichmann is currently working as CTO at Laserdata GmbH. Volker is a member of the SAGA GIS core development team (www.saga-gis.org) and has a strong background in scientific research, especially in LIDAR remote sensing, Geomorphology, Natural Hazards and Geoscientific Software Development. He has been working as Senior Researcher at the alpS Center for Climate Change Adaptation Technologies for twelve years after he quit employments as Research Assistant at the universities of Munich, Göttigen and Eichstätt. As Laserdata is a spin-off (2007) of the University of Innsbruck he is now mostly involved in research activities taking place at their Institute of Geography in addition to many close collaborations with other universities and project partners.
Additional affiliations
April 2007 - present
LASERDATA GmbH
Position
  • CEO

Publications

Publications (55)
Technical Report
Full-text available
This document is a best practice guide for automated geomorphological mapping based on medium-resolution satellite data. It describes the MorphoSAT mapping system and the results that were achieved in the project. With the methodological details provided, interested researchers and practitioners are encouraged to repeat, extend or modify the propos...
Article
Full-text available
In complex mountainous terrain the mapping efficiency is a crucial factor. Unmanned aerial vehicle (UAV) based laser scanning (ULS) has the capability for efficient mapping, as it allows realizing higher flight velocities, higher flying altitude above ground level (AGL) and larger distances between neighbouring flight strips, compared to image base...
Article
Full-text available
Slow moving deep-seated gravitational slope deformations are threatening infrastructure and economic wellbeing in mountainous areas. Accelerating landslides may end up in a catastrophic slope failure in terms of rapid rock avalanches. Continuous landslide monitoring enables the identification of critical acceleration thresholds, which are required...
Article
Full-text available
Multi-temporal 3D point clouds acquired with a laser scanner can be efficiently used for an area-wide assessment of landslide-induced surface changes. In the present study, displacements of the Vögelsberg landslide (Tyrol, Austria) are assessed based on available data acquired with airborne laser scanning (ALS) in 2013 and data acquired with an unm...
Article
Full-text available
Deep-seated gravitational slope deformations (DSGSDs) endanger settlements and infrastructure in mountain areas all over the world. To prevent disastrous events, their activity needs to be continuously monitored. In this paper, the movement of the Reissenschuh DSGSD in the Schmirn valley (Tyrol, Austria) is quantified based on point clouds acquired...
Article
Terrestrial laserscan (TLS) surveys allow the geological investigation of rock slopes, which cannot be measured by direct surveys because of inaccessibility, high hazard potential or excessive effort. The normal joint spacing and the in situ block size distribution are relevant properties for rock mass characterisation but are commonly evaluated st...
Poster
Full-text available
Digital inventories of geomorphological feature types (e.g. landslides, alluvial fans and glacial cirques) at regional spatial scales are urgently required to improve our understanding of earth surface processes and to support a continuous improvement of protection measures against natural hazards. The currently available digital inventories have t...
Conference Paper
Survey techniques such as scanline sampling and terrestrial laserscanning (TLS) allow detailed and objective evaluations of various rock mass characteristics such as the joint orientations, joint sizes or joint spacings. Point clouds from remote sensing also provide the possibility of area-wide analyses of geological and geometrical data in the ent...
Article
Full-text available
Abstract The investigation of changes in spatial patterns of vegetation and identification of potential micro-refugia requires detailed topographic and terrain information. However, mapping alpine topography at very detailed scales is challenging due to limited accessibility of sites. Close-range sensing by photogrammetric dense matching approaches...
Article
Fine-scale architectural tree models serve as an effective representation of three-dimensional plant material distributions. They can help to quantify wood volume and biomass, to estimate leaf area distributions on a detailed scale, and can be exploited for physically based modelling approaches. If architectural tree models can be derived for multi...
Article
Full-text available
The Gravitational Process Path (GPP) model can be used to simulate the process path and run-out area of gravitational processes based on a digital terrain model (DTM). The conceptual model combines several components (process path, run-out length, sink filling and material deposition) to simulate the movement of a mass point from an initiation site...
Article
In this study a combination of different topographic data from historic topographic maps and remote sensing is used to reconstruct and monitor the behaviour of the high alpine ice contact rockslide system Marzell and its response to glacial debuttressing in the Eastern Alps. Topographic data from archives (historical topographic maps, national glac...
Article
Full-text available
Canopy density measures such as the Leaf Area Index (LAI) have become standardized mapping products derived from airborne and terrestrial Light Detection And Ranging (aLiDAR and tLiDAR, respectively) data. A specific application of LiDAR point clouds is their integration into radiative transfer models (RTM) of varying complexity. Using, e.g., ray t...
Article
Full-text available
The Gravitational Process Path (GPP) model can be used to simulate the process path and run-out area of gravitational processes based on a digital terrain model (DTM). The tool combines several sub-models (process path, run-out length and material deposition) to simulate the movement of a mass point from an initiation site to the deposition area. F...
Article
Long-range terrestrial laserscanning (TLS) is an emerging method for the monitoring of alpine slopes in the vicinity of infrastructure. Nevertheless, deformation monitoring of alpine natural terrain is difficult and gets even more challenging with larger scan distances. In this study we present approaches for the handling of spatially variable meas...
Conference Paper
Full-text available
Recently multispectral LiDAR became a promising research field for enhanced LiDAR classification workflows and e.g. the assessment of vegetation health. Current analyses on multispectral LiDAR are mainly based on experimental setups, which are often limited transferable to operational tasks. In late 2014 Optech Inc. announced the first commercially...
Article
Full-text available
Abstract. The System for Automated Geoscientific Analyses (SAGA) is an open source geographic information system (GIS), mainly licensed under the GNU General Public License. Since its first release in 2004, SAGA has rapidly developed from a specialized tool for digital terrain analysis to a comprehensive and globally established GIS platform for sc...
Article
Information on geometries and kinematics of landslides are necessary to establish geological slope deformation models. We present two complementary geospatial methods to analyze landslide surface changes even in areas affected by strong surface pattern changes, making use of airborne laser scanning (ALS) data. An image correlation method based on s...
Article
Full-text available
The System for Automated Geoscientific Analyses (SAGA) is an open-source Geographic Information System (GIS), mainly licensed under the GNU General Public License. Since its first release in 2004, SAGA has rapidly developed from a specialized tool for digital terrain analysis to a comprehensive and globally established GIS platform for scientific a...
Article
Erosion rates within the small catchment of an endorheic basin located in the upper Fremridalur (NE-Iceland) were quantified using a combination of borehole data, tephrochronology, terrestrial LiDAR and GIS techniques. Despite the great distance of the study area to the volcanic centers active during the Holocene, it was possible to identify five t...
Article
The application of multi-temporal topographic LiDAR data has become a standard for many mapping and monitoring applications in man-made and natural environments. With increasing availability of area-wide, high-resolution, multi-temporal datasets and the increasing interest in working with the original measured 3D topographic LiDAR point clouds, cha...
Article
Digital terrain models (DTMs) are a standard data source for a variety of applications. DTM differencing is also widely used for detection and quantification of topographic changes. While several investigations have been made on the accuracy of DTMs, calculated from different kinds of input data, little has been published on the error of DTM differ...
Article
Full-text available
There are very little attempts of DEM evaluation in such a disturbed or discontinuous surface (e.g., in tillage area). Present study aims to evaluate common interpolation methods (triangulation, nearest neighbor, natural neighbor, minimum curvature, multiquadratic radial basis function (MRBF), ordinary kriging, and inverse distance weight) in...
Conference Paper
Full-text available
The mapping of road environments is an important task, providing important input data for a broad range of scientific disciplines. Pole-like objects, their visibility and their influence onto local light and traffic noise conditions are of particular interest for traffic safety, public health and ecological issues. Detailed knowledge can support th...
Article
Full-text available
The architecture of trees is of particular interest for 3D model creation in forestry and ecolocical applications. Terrestrial (TLS) and mobile laser scanning (MLS) systems are used to acquire detailed geometrical data of trees. Since 3D point clouds from laser scanning consist of large data amounts representing uninterpreted topographical informat...
Conference Paper
Full-text available
Change detection of dynamic surface elements is an important application in geomorphological analysis. In order to be able to investigate such changes, the high spatial resolution and accuracy of the laser scanning technology is exploited. Dealing with laser scanning data, most change detection approaches are aiming at the assessment of volumetric...
Article
LiDAR data were used to quantify and analyse a rockfall event which occurred in 2003 in the Western Dolomites (Italian Alps). In addition to previously existing airborne laserscanning (ALS) data, high resolution terrestrial laserscanning (TLS) data were collected. By using the original point clouds, the volume, axial ratio and runout length of sing...
Conference Paper
Full-text available
Working with high-resolution digital terrain models (DTMs) has become common practice for many geomorphologic and geomorphometric applications. Nowadays, with the up-come of Airborne Laser Scanning (ALS) and high resolution aerial photography, high resolution (1 m cell size or smaller) DTMs are available even for relatively large areas. With those...
Article
Rockfall processes play a major role as a natural hazard, especially if the rock faces are located close to infrastructure. However these processes cause also the retreat of the steep rock faces by weathering and the growth of the corresponding talus cones by routing debris down the talus cones. That's why this process plays also an important role...
Article
Fluvial activity in hillslope channels play a major role for the geomorphic system in alpine catchments as they link sediment sources in the upper parts of the catchment to the channel network. Within the framework of the SEDAG Project (Sediment Cascades in Alpine Geosystems) it was the aim of the presented work to measure the fluvial bedload disch...
Article
The delineation of sediment cascades in alpine geosystems requires the identification and localisation of the effective geomorphic processes. In order to classify the terrain on that basis, modelling approaches originally designed for natural hazard zonation were extended. Four sub-models are used to simulate geomorphic processes: (1) potential ini...
Conference Paper
The activity of geomorphic processes in densely populated high mountains can lead to extensive damages. Torrents which are connected to the densely populated valleys pose a major threat. The hazard potential of such torrents is controlled by the availability of sediment in the channel which is supplied by the geomorphic processes in their catchment...
Article
Full-text available
The sediment budget and morphodynamics of a single talus sheet-debris cone complex in an Alpine glacial valley of the Northern Calcareous Alps is analysed on three different time scales. The undercutting, truncation and dissection of this sedimentary storage system caused by a high-magnitude event in August 2005 is documented and analysed using mul...
Article
This study was conducted in the catchment area of the Lahnenwiesgraben in the Ammergebirge Mountains north-west of Garmisch-Partenkirchen. At 34 sites the field-saturated hydraulic conductivity was measured with a Guelph-Permeameter. The measurements were classified with a geographic information system (GIS) by means of available digital maps of ve...
Chapter
Full-text available
Within the SEDAG project the sediment yield of various processes (including soil erosion, rockfall, debris flows, shallow landslides and full-depth avalanches) is studied in two catchment areas in the Northern Limestone Alps, Germany. As a first step in examining the sediment budget, several models were developed to 1) identify locations at which t...
Article
Full-text available
Full-depth snow avalanches as a geomorphic process are investigated in this study, which is part of the SEDAG (SEDiment cascades in Alpine Geosystems) research project. First results concerning the sediment yield of these events were presented in an earlier paper (HECKMANN ET AL. 2002). Here, they are supplemented with new data and a description of...
Article
Full-text available
Many geomorphic processes contribute to the sediment budgets of high-mountain geosystems. The interaction of these processes to form a sediment cascade can be investigated, interpreted and visualized on the basis of spatial models calibrated by field measurements. We present the results of field measurements and modelling for a talus slope in one o...
Article
A model to describe the spatial distribution of torrent bed type debris flows in alpine drainage basins was developed and validated by field measurements. In addition to the determination of debris flow initiation sites, process pathway and erosion and deposition zones were identified. Potential process initiation sites were derived from channel sl...
Article
Different modelling ap proaches for geomorphic processes (rockfall, debris flows, landslides] are described and examples from an alpine drainage basin in the Northern Limestone Alps (Lahnenwiesgraben) are presented. Locations of process initiation are determined by using a digital elevation model and thematic maps of the environmental conditions. A...
Article
Full-text available
Within the SEDAG project the sediment yield of various processes (including soil erosion, rockfall, debris flows, shallow landslides and full-depth avalanches ) is studied in two catchment areas in the Northern Limestone Alps, Germany. As a first step in examining the sediment budget, several models were developed to 1) identify locations at which...
Article
Full-text available
This study aims at quantifying and modelling the contribution of snow avalanches to the sediment balance of alpine catchment areas. It is part of the SEDAG research project (SEDiment cascades in Alpine Geosystems) taking place in two drainage basins in the northern limestone Alps (Lahnenwiesgraben / Ammergebirge mountains, Reintal / Wetterstein mou...
Article
Full-text available
Most solar radiation models implemented in Geographical Information Systems (GIS) operate on 2.5D raster data. There are only a few models using the full 3D information of a point cloud obtained by e.g. Airborne Laser Scanning (ALS) systems. However, models performing point cloud based solar radiation modeling are not suitable for large study areas...

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Projects

Projects (3)
Archived project
The main objective of MorphoSAT is to implement, test and validate an innovative system for operational production of objective GIS-ready semantically-rich geomorphological maps/information. The system will exploit and integrate recent (near-)global consistent satellite data and products (WorldDEM, ERS-2/ENVISAT, Sentinel-2, Copernicus land services, etc.), as well as LiDAR data. The project aims at maximizing the integration of experts and potential customers (e.g. industry, public authorities, researchers, spatial planners) in the specification and validation phases of the project such that MorphoSAT products, i.e. geomorphological maps and automated tools, are targeted to user needs.
Archived project
The primary objective of this project is the application of remote sensing methods to investigate geological and geotechnical problems and to assess the hazard and risk of natural hazards in the context of infrastructure and climate change. For that reason pre-existing and new methods and tools are improved and developed for selected case studies. Furthermore, remote sensing technologies (e.g. multi-temporal aerial photography, satellite imaging, photogrammetry, laser scanning, radarinterferometry) offer a proven means to detect and monitor endangered and inaccessible areas in an area-wide manner. The field of application of remote sensing is widespread and comprises the generation of high resolution digital terrain models, spatial mapping of geological structures, geotechnical rock mass classification, determination of volume changes, and monitoring of slope deformations. [http://www.mountainresearch.at/index.php/en/remote-sensing-and-geomatics]