117 research outputs found
Vom Gelände zur Karte...: Festschrift anlässlich des 65. Geburtstages von Prof. Dr. phil. habil. Manfred F. Buchroithner
No full textAnlässlich des Festkolloquiums zum 65. Geburtstag von Manfred Buchroithner publiziert das Institut für Kartographie die vorliegende Festschrift. Die wissenschaftlichen Beiträge reflektieren ausgewählte Forschungsthemen zu Grundsatzfragen der raum-zeitlichen kartographischen Visualisierung, Gestaltungsoptionen in digitalen 3D-Landschaftsmodellen, weiteren Problemen der 3D-Kartographie über Analysen und Wertungen der Hochschulausbildung Kartographie in Deutschland, dem Gletschermonitoring in Hochasien, der Höhlenvermessung auf Borneo bis hin zur Modellierung des landwirtschaftlichen Flächenpotentials im Sudan.:Zum Wirken von Manfred Buchroithner, Dirk Burghardt 5
Knowledge about Glacier Mass Changes in High Asia Significantly Improved due to TUD-IfK Research, Tobias Bolch, Tino Pieczonka, Nicolai Holzer, Juliane Peters, Kriti Mukherjee, Atanu Bhattacharya 13
Kartographie: Visualisierung von Objekten und Phänomenen in Raum und Zeit – Ein Essay in zehn Aspekten, Lorenz Hurni 25
Autostereoskopie am Institut für Kartographie der TU Dresden, Claudia Knust 49
Speleology of the Gomantong Karst Systems beyond the Edible Birds’ Nest, Mohammed Oludare Idrees, Biswajeet Pradhan 59
Anmerkungen zu Gestaltungsoptionen in digitalen 3D-Landschaftsmodellen, Nikolas Prechtel 75
Studienangebote im Umfeld Kartographie und Geomatik an den traditionellen Stätten grundständiger Kartographie-Lehre in Deutschland – ein Vergleich, Gertrud Schaab 97
Modelling the Restoration Potential of Abandoned Agricultural Land in Gadarif Region, Sudan, Hussein M. Sulieman 117
Verzeichnis der Habilitationen 127
Verzeichnis der Promotionen 129
Verzeichnis der Publikationen Manfred F. Buchroithner 13
Satellite stereo images for Risk monitoring
No full textSurface monitoring is essential to understand the spatial and temporal evolution of complex landscape modifications and instabilities related to road and railway infrastructures. In recent years, the terrain change detection methods have evolved particularly with the development of increasingly automatic extraction procedures of both DTM and DSM.Prevention of damages caused by natural disasters does not only concern weather forecasts, but requires constant attention and practice of monitor-ing and controlling human activity on territory. Practically, the problem is not knowing if and when an event will affect a determined area, but recog-nizing the possible damages if this event happened, by adopting adequate measures to keep them down as far as possible, and requires the necessary tools for a timely intervention. To solve such requirements, current satellite technology, with recurrent data acquisition for the timely generation of car-tographic products updated and coherent to the territorial investigation, offers the possibility to fill the temporal gap between the need of urgent information and official reference information. The fundamental merits of the high resolution remote sensing methods are the ability to perform sur-veys at regular intervals, the characteristics of the image and the revisit times. These features are very useful in environmental monitoring especial-ly in the event of emergency or also in medium scale cartographic produc-tion, particularly in the zones of difficult access and in developing countries.The research presented here aims at answer to the growing need of optimi-zation and rationalization of long term monitoring systems of displace-ments and degradation due to the interaction of artificial artifacts of transport with such natural phenomena. To test the methodology we chose an area that presents a particular geo-morphological setting, in the munici-pality of Fasano (BR, Southern Italy). The area is affected by frequent hy-drogeological dangerous events such as flooding and is classified as a zone of “high hydraulic hazard” in the regional Hydrogeological Structure Plan (PAI). For this area we used a GeoEye-1 stereo-pair for extracting a DTM in order to verify the usefulness of satellite techniques for the recognition of environmental risk
An evaluation of web-based geovisualizations for different levels of abstraction and realism – what do users predict?
No full textWeb-based geovisualizations are produced and served in various levels of abstraction (or realism) such as two-dimensional (2D) cartographic maps, aerial and satellite maps, shaded relief maps, three-dimensional (3D) objects integrated with 2D base maps, and digital globes with fully textured realistic 3D representations. All of these are necessary; but which one is best fitting for which task? When do we need the highest level of realism, and when can or should we use the highest level of abstraction? To contribute to tackling these large questions, we study a subset of non-expert tasks selected from task taxonomies in literature in relation to a subset of existing geovisualizations by means of two online user studies. In an online survey, users (n=106) responded to a list of tasks, where we ask them to predict which of the visualizations they think they would use for this task (thus we measure perceived preference). In a second survey, we give the users (n=245) a set of tasks to solve using one of the provided visualizations, thus we observe which level of abstraction/realism they will actually use and measure actual preference (choice) as well performance. In this paper, we report the results from the first survey
Coastal Zone Geomorphological Mapping Using Landsat TM Imagery: An Application in Central Albania
No full text-Studio delle coste albanesi tramite dati satellitar
The Airborne High Resolution Stereo Camera (HRSC-A) as a Tool for High Mountain Cartography
No full textThe airborne High Resolution Stereo Camera (HRSC-A) is a multiple line scanner which simultaneously acquires stereo and colour information with absolute spatial accuracy in the decimetre range. The multiple stereo principle applied ist particularly well suited for otaining precise topographic and imaging data of rugged terrain as found in mountainous regions: a permanently nadir-looking stereo channel provides favourable visibility conditions and minimises the occurrence of shadow zones which affect the performance of side-looking sensor systems such as SAR. A sophisticated and fully automated photogrammetric processing system allows to dertermine topography even in areas which are problematic for image correlation techniques neede to extract height information from stereo imagery, e.g. in areas with low texture information like snow. In order to supplement existing monitoring techniques for snow and ice-covered regions, HRSC-A was used in a pilot study to map an area of the Hohe Tauern mountain range in Austria enclosing some of the most intensively analysed glaciers in the Alps. The results are of outstanding quality and suggest the future application of HRSC-A for the remote sensing of snow and ice, particularly in the context of climate-related studies
Calculating and Visualising Terrain Slopes based on Digital Elevation Models derived from High-Resolution Stereo Images
No full textCartographic Representation of Spatial Data Quality Parameters in Volunteered Geographic Information
No full textVolunteered geographic information (VGI) are constantly being added, edited or removed by the users, so their quality is not static. As VGI users do not necessarily have high spatial knowledge, system administra-tors control the quality of information in order to provide the users with the appropriate datasets. However, quality of spatial data has several parame-ters, so the appropriate data may differ from one application to another. Unlike the geographic communities, presenting the standard metadata statements is not so efficient, as they may not be familiar for VGI users. In this paper, we propose providing VGI users with the spatial data quality parameters through simple cartographic representations and let them de-cide on appropriateness of the datasets for the application at hand. The us-ers select the desired quality parameters as well as the visualization element (e.g. color, line thickness, intensity, style, etc.) to classify the datasets. The datasets are represented by the selected element based on their metadata information, which help the users to visually evaluate the quality of da-tasets.Volunteered geographic information (VGI) are constantly being added, edited or removed by the users, so their quality is not static. As VGI users do not necessarily have high spatial knowledge, system administra-tors control the quality of information in order to provide the users with the appropriate datasets. However, quality of spatial data has several parame-ters, so the appropriate data may differ from one application to another. Unlike the geographic communities, presenting the standard metadata statements is not so efficient, as they may not be familiar for VGI users. In this paper, we propose providing VGI users with the spatial data quality parameters through simple cartographic representations and let them de-cide on appropriateness of the datasets for the application at hand. The us-ers select the desired quality parameters as well as the visualization element (e.g. color, line thickness, intensity, style, etc.) to classify the datasets. The datasets are represented by the selected element based on their metadata information, which help the users to visually evaluate the quality of da-tasets
Operational Digital 3D-Image Acquisition and Photogrammetric Processing with the High Resolution Stereo Camera (HRSC)
No full textGlacier lake outburst floods (GLOFs) – mapping the hazard of a threat to High Asia and beyond
No full textLakes are scenic assets for any high-mountain landscape. They can, however, also be dangerous. This applies particularly to lakes in the immediate neighbourhood of or even on glaciers. These lakes are known to be prone to outbursts due to various reasons, and these high-energy events can be signifi cant threats to life, property and infrastructure and rather disastrous along the stretches further down the valleys (Ives 1986, Richardson and Reynolds 2000, Ives et al. 2010, Han et al. 2013). Globally, the glaciers are in a general state of retreat, most probably because of climatic warming (WGMS 2008). They often leave behind voids fi lled by melt water called glacial lakes which tend to burst because of internal instabilities in the natural moraine dams retaining the lakes (e.g., as a result of hydrostatic pressure, erosion from overtopping, or internal structural failure) or as a result of an external trigger such as a rock or ice avalanche, or even earthquake.</p
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