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Auflistung nach Autor:in "Chrysoulakis, Nektarios"

1 - 5 von 5
  • Konferenzbeitrag
    Development of a Decision Support System for Technological Risk Management with the Combined Use of Remote Sensing and GIS
    (Environmental Communication in the Information Society - Proceedings of the 16th Conference, 2002) Chrysoulakis, Nektarios; Prastacos, Poulicos
    In this study, a GIS tool is proposed for the support of technological risk management based on integration of moderate and high spatial resolution satellite imagery with in-situ vector data. A major technological accident scenario was developed for the region of Athens (Greece) in order to present the functionality of the GIS tool for the support of decision-making during the crisis, as well as for the assessment of the accident’s impact to natural and human environment.
  • Konferenzbeitrag
    Extraction of Surface Properties from a High Accuracy DEM Using Multiscale Remote Sensing Techniques
    (Informatics for Environmental Protection - Networking Environmental Information, 2005) Grazzini, Jacopo; Chrysoulakis, Nektarios
    Research into understanding relationships between landscape pattern and process has been influenced by the introduction of fractal geometry and the advent of fractal analysis. With the increasing availability of high-resolution digital elevation data from increasingly larger areas of the Earth’s surface, together with advances in geocomputation and the field of geomorphometry, the concept of fractals has became even more interesting for local level environmental applications. The work described in this paper aims at investigating the applicability of multifractal based techniques for the representation of high-resolution digital elevation models. A multifractal algorithm, initially developed for image processing, is employed for the construction of a multiresolution representation and for the reconstruction of approximate elevation models with arbitrary accuracy. It is showed to fully describe digital elevation models, while simplifying them. By addressing the issues of structure and scale, the multifractal formalism provides, unlike classical geomorphometrical tools, scale-invariant attributes for characterizing topography and landscapes. It is showed that the multifractal approach is a useful tool to analyze the topography represented by the digital elevation model.
  • Konferenzbeitrag
    ICT for Urban Metabolism: The case of BRIDGE
    (Environmental Informatics and Industrial Environmental Protection: Concepts, Methods and Tools, 2009) Chrysoulakis, Nektarios; Vogt, Roland; Young, Duick; Grimmond, C. Susan; Spano, Donnatella; Marras, Serena
    Cities consume material and energy inputs, process them into usable forms, and eliminate the wastes from the internal processes. These processes comprise the "metabolism" of industry, commerce, municipal operations and households. A bottom-up approach based on quantitative estimates of urban metabolism components, at local and regional scales, can be obtained by considering the three-dimensional (3D) exchange and transformation of energy and matter between a city and its surroundings. Recent advances in bio-physical sciences have led to new methods and models to estimate local scale flows. However, there is often poor communication of new knowledge and its implications to urban planners, architects and engineers. Recently, increasing attention is being directed to bridge this gap. One opportunity of Information and Communication Technology (ICT) to reduce this gap is through better integration of scientists into planning. Here, ICT tools and techniques that can be used in bottom-up urban metabolism studies, focusing on energy, water, carbon and pollutants are briefly reviewed. How these tools and techniques are used in the BRIDGE project to develop a decision support system to address the challenges of sustainable urban planning with regards to the urban metabolism is outlined. The approach proposed provides quantitative measures of energy, water, carbon and pollutants fluxes, estimates their environmental impacts and socioeconomic benefits and proposes guidelines for resource optimisation.
  • Konferenzbeitrag
    Servicing Environmental E-Learning (E2-Learning): using Geographic Information and Remote Sensing Web Services to support E2-Learning
    (Informatics for Environmental Protection - Networking Environmental Information, 2005) Kotzinos, Dimitris; Konstantinou, Giorgos; Chrysoulakis, Nektarios
    E-learning efforts, that use or support environmental information, have been around for quite some time now. In this work a framework of environmental web services is proposed, described and developed in order to support the creation of a virtual environmental lab, shared among different higher educational institutions. Several algorithms and data are implemented as case and feasibilty examples and presented in the paper. Also the corresponding clients that provide access to the web services have been implemented and can be used independently by each contributing institution in order to provide a customization mean. This work aims at complememting and work alongside with both in class teaching and e-learning systems.
  • Konferenzbeitrag
    Urban Metabolism and Resource Optimisation in the Urban Fabric: The BRIDGE Methodology
    (Environmental Informatics and Industrial Ecology, 2008) Chrysoulakis, Nektarios
    Like any living system, urban communities consume material and energy inputs, process them into usable forms, and eliminate the wastes from the process. This can be seen as "metabolism" of industry, commerce, municipal operations and households. Understanding the pattern of these energy and material flows through a community's economy provides a systemic reading of the present situation for goal and objective setting and development of indicators for sustainability. At present, planning policies often reflect the logic of the market. They would better reflect a vision of urban development, in which environmental and social considerations are fully embedded in spatial planning policies at all steps of the policy cycle from problem identification and policy design through to the implementation and expost evaluation stages. Therefore, the widespread inclusion of sustainability objectives in urban planning from regional to site level is necessary, providing the opportunity for the incorporation of bio-physical sciences knowledge into the planning process on a routine basis. To this end, the project BRIDGE (sustainaBle uRban plannIng Decision support accountinG for urban mEtabolism) aims at bridging the gap between bio-physical sciences and urban planners and at illustrating the advantages of accounting for environmental issues on a routine basis in design decisions. BRIDGE will provide the means to quantitative estimate the various components of the urban metabolism (observation of physical flows and modelling), the means for quantitative estimate their impacts (socio-economic and environmental impact assessments and indicators), as well as the means for resource optimisation in urban fabric (support the decision making in urban planning). BRIDGE focuses on the interrelation between energy and material flows and urban structure. The methodology and the conceptual design of the BRIDGE Decision Support System are presented in this study.