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Auflistung nach Autor:in "Thinh, Nguyen Xuan"

1 - 10 von 12
  • Konferenzbeitrag
    A Fuzzy Compromise Programming Environment for the ecological evaluation of land use options
    (Sh@ring – EnviroInfo 2004, 2004) Thinh, Nguyen Xuan; Hedel, Ralf
    In this paper we describe an extension of the Compromise Programming (CP a multiple criteria optimization method) into Fuzzy Compromise Programming (FCP). By linking of Fuzzy modelling, CP and multiple criteria evaluation (MCE) into a Geographical Information System (GIS), we created a Fuzzy Compromise Programming Environment for the ecological evaluation of land use options as an AML-program (Arc Macro Language). After an introduction, a short description of a framework for GIS-based multiple criteria decision analysis is given in section 2. The section 3 describes the methodology of Hierarchical Fuzzy Evaluation. The section 4 deals with the extension of the CP into FCP. Finally, the section 5 reports about application results of the AML-program for the ecological evaluation of land use options in a suburbanisation area.
  • Konferenzbeitrag
    Analysis of GIS data to investigate natural resource impacts of high-voltage overhead lines in the examples in Lower Saxony and North Rhine-Westphalia
    (Proceedings of the 27th Conference on Environmental Informatics - Informatics for Environmental Protection, Sustainable Development and Risk Management, 2013) Thinh, Nguyen Xuan; Sander, Leon; Kopec, Jakob; Mühlnickel, Kai
    In this paper we describe shortly Lower Saxony and North Rhine-Westphalia as study areas and the legal framework, both in the context of natural resource impacts of high-voltage overhead lines. We then conduct the buffer analysis of a GIS dataset in order to investigate natural resource impacts of existing high-voltage overhead lines in the two mentioned study areas. The paper is based upon the first results of the interdisciplinary research and development project "Power Network Planning" funded as part of the 6th Energy research program "Research for an environmentally friendly, reliable and affordable energy supply" by the German Federal Ministry of Economics and Technology (BMWi).
  • Konferenzbeitrag
    Application of the Analytic Hierarchy Process in the Multiple Criteria Decision Analysis of Retention Areas for Flood Risk Management
    (Environmental Informatics and Systems Research, 2007) Thinh, Nguyen Xuan; Vogel, Rico
    Problems of flood risk management are inherently complex, multifaceted, and involving many decision makers with conflicting priorities. Multiple criteria decision analysis (MCDA) can help to manage this complexity and decision support by combining human judgments and information in a structured decision framework. Our paper gives first a brief description of the method “Analytic Hierarchy Process” (AHP) and highlights some advantages of the AHP in the land suitability analysis and then reports about the development of a methodology by linking of Compromise Programming (CP), AHP, and GIS for the multiple criteria decision analysis of retention areas in the German part of the Elbe River flood plain. The authors describe also the development of indicators and the implementation of the methodology as an ArcGIS Extension and the AHP as a PHP web program. Keywords: Analytic Hierarchy Process, Compromise Programming, GIS, ArcGIS Extension, PHP Web Program, Land Suitability Analysis, Retention Areas, Flood Risk Management, Elbe River.
  • Konferenzbeitrag
    Contemporary Spatial Analysis and Simulation of the Settlement Development of the Dresden City Region
    (The Information Society and Enlargement of the European Union, 2003) Thinh, Nguyen Xuan
    Spatial analysis and simulation is an essential part of plan-making. This article gives first some results of the application of a methodology developed by the author to analyse the urban form (spatial configuration of the land-use) of the Dresden city region. Using the geographical information system (GIS) ARC/INFO the author computed several metrics such as jaggedness degree, fractal dimension, gravitation measure, relative entropy, and density gradient to measure the degree of urban sprawl and identify the changes of his-torical land-use patterns of the Dresden city region for the years 1880, 1900, 1940, 1953, 1968, 1986, and 1998. The results indicate that contemporary urban growth is character-ised by dispersal and decentralised patterns. Today, there are many debates on how to confine urban sprawl and conserve agricultural land and other important environmentally sensitive areas. Therefore the author linked the spatial analysis to dynamic urban model-ling and developed a multi-layer cellular automata (CA) model to simulate different types of urban forms. This model is one of a new generation of urban simulation models designed underlying of the spatial analysis to help planners create and compare alterna-tive land-use policies: compact monocentric development, decentralized concentration, dispersed development.
  • Konferenzbeitrag
    Extending GIS-Functionality for the Analysis of 3D Data in Landscape Ecology – A Comparison of Different Approaches
    (Environmental Informatics and Systems Research, 2007) Thinh, Nguyen Xuan; Dang, Le Hai; Hoechstetter, Sebastian; Walz, Ulrich
    Powerful tools for the analysis of spatial data and the characterisation of landscape patterns are required for a sound understanding of ecological processes. This particularly holds true for 3D-data, as topography and surface of vegetation and human artefacts plays an important role in the geomorphological, hydrological, and biological processes present in the landscape. This paper discusses the necessity to integrate mathematical methods and algorithms into geographic information systems (GIS), especially ArcGIS from ESRI®, in order to develop 3D-indices in landscape ecology. Moreover, different ways to extend the analytical capacity of standard GIS are described and compared. A demonstration of programming in .Net will be given. Finally, the third section reports about some examples for applications which have been conducted in a study financed by the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG).
  • Konferenzbeitrag
    Further Development of a Methodology for the Ecological Evaluation of Land-Use Options and Application to the Dresden Elbe-Region
    (Managing Environmental Knowledge, 2006) Thinh, Nguyen Xuan; Vogel, Rico
    Assessments are immanent components of spatial planning and one of the central tasks in environmental management particularly with regard to flood risk management. Mitigation of flood risks can be achieved through various structural and non-structural measures. Comparison of different measures and evaluation of their impacts is based on the multiple criteria evaluation. In this paper we report about the further development of a methodology for the ecological evaluation of land-use options and the application to the Dresden Elbe-Region in the context of flood risk management. We describe enhancements of indicators, apply the method “Compromise Programming” and conduct multiple criteria evaluation of the sites in the study area for residential settlement. Thereby a few of methodological and information technical problems are discussed. As the investigation area the circular area with the centre in the city centre of Dresden and a radius of 20 km was selected. In this study we describe the data transformations of different datasets such as the German “Amtliches Topographisch-Kartographisches Informationssystem” (ATKIS) or a Digital Elevation Model (DEM) of the Dresden Elbe-Region. Furthermore results of “Compromise Programming” are explained and discussed.
  • Konferenzbeitrag
    Introduction into Work Package Urban Flooding of the BMBF Megacity Research Project TP. Ho Chi Minh
    (Environmental Informatics and Industrial Environmental Protection: Concepts, Methods and Tools, 2009) Thinh, Nguyen Xuan; Bräuer, Anne; Teucher, Verena
    Urban flooding in Ho Chi Minh City (HCMC) has been risen as one of the most concerned topics since recent decades. Thus, this topic is an important issue in the BMBF “Megacity Research Project TP. Ho Chi Minh”, coordinating by Brandenburg University of Technology Cottbus. The project is divided into two Action Fields “Urban Environment” and “Urban Development” with their own respective thematic Work Packages. The Action Field “Urban Environment” encompasses five Work Packages: Adaptation Planning Framework, Urban Flooding, Urban Climate, Urban Energy, and Urban Transport (see BTU 2007 and Storch & Schmidt 2008). The Leibniz Institute of Ecological and Regional Development is co-leader of the work package Urban Flooding. The objectives of the work package „Urban Flooding“ are (1) to determine conflict areas and vulnerability for different flooding situations within HCMC, (2) to compile flood hazard maps for HCMC, and (3) to develop strategies and measures for efficient flood risk management in HCMC. Hereby one has to distinguish between hazard and risk maps. The hazard map describes the spatial distribution of flood damages for previous events, whereas the risk map displays the possible damage with a given probability of occurrence. In this paper, we report about the status quo of our work package. The main conducted work consists of (i) literature review, (ii) data collection and development of a geo-database, and (iii) initial GIS-analysis and statistical analysis of geo-database and first results.
  • Konferenzbeitrag
    Investigation of Land Cover Change and Land Surface Temperature for the Megacity Ho Chi Minh City using Landsat Imagery
    (Proceedings of the 27th Conference on Environmental Informatics - Informatics for Environmental Protection, Sustainable Development and Risk Management, 2013) Thinh, Nguyen Xuan; Kopec, Jakob
    Rapid uncontrolled urban growth over last twenty years creates significant pressures for the environment and many challenges for urban planning in Ho Chi Minh City (HCMC). One of the big challenges is land management. The application of remote sensing can provide reliable and current geodata bases for land management and land use monitoring in HCMC. In this study we used Landsat Imagery to detect and analyse the land cover change HCMC for the periods 1989 2000, 2000 2002 and 2002 2005 in order to find out the extent of the urban growth in HCMC in these time periods. The next important task is to evaluate the urban growth regarding well known urban planning principles like the compact city or the city of short distances . This will be done by mean of urban density gradient , the jaggedness degree and the centre oriented entropy developed by Thinh (2004). Our results show the dimension of urban expansion in HCMC and the potential of the linkage between remote sensing techniques and urban form metrics as a powerful and useful tool for modern land use change monitoring. They are very useful for the investigation of growth patterns and land use planning in HCMC.
  • Konferenzbeitrag
    Methodology and application development for monitoring quality of life in Dresten
    (Integration of Environmental Information in Europe, 2010) Thinh, Nguyen Xuan; Müller, Bernhard; Terne , Franziska; Holfeld , Michael
    The present article describes the development of a methodology and of a software for monitoring quality of life as well as the implementation and application in the Urban Planning Authority of Dresden. We will discuss quality of life indicators, approaches to modelling and multiple criteria evaluation of the quality of life in cities. Advantages of the developed method “Modified z-Transformation” are explained. This method is recommended for the practical application. A short report about the application of the developed monitoring system to Dresden will be given.
  • Konferenzbeitrag
    Pin-pointing sustainable urban land-use structures with the aid of GIS and cluster analysis
    (Sustainability in the Information Society, 2001) Thinh, Nguyen Xuan; Arlt, Günter; Heber, Bernd; Hennersdorf, Jörg; Lehmann, Iris
    As part of the national and international campaign to achieve the goal of sustainable development the search for sustainable urban form is in full swing. But the relationship between urban form and sustainability is currently still hotly debated. The need for more scientific and objective knowledge leads to a whole range of research to measurement of the physical compactness of urban settlement patterns. However the term "compactness of a city" has been defined by many only qualitatively. This induces us to create a ARC/INFO-database of land use patterns and to model the physical compactness of 116 regional cities in Germany (administratively autonomous municipalities). Moreover we calculated the degree of sealing and land price of these cities. There are many examples of claims and counter-claims within compact city theory. For example, it is claimed that the compact city protects the countryside; the counter-argument is that ecologically important urban green spaces are lost. Also it is claimed that the compact city can improve the economic attractiveness of an area; but it could be argued that the compact city generates higher land prices, making housing and business premises prohibitively expensive. For these reasons we carried out the Cluster Analysis for the 116 cities with the variables degree of sealing as an ecological indicator and land price or gross value added per m2 of settlement areas as an economic indicator in order to find out the sustainable balance between ecological and economic performance potential.