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Auflistung nach Autor:in "Karppinen, Ari"

1 - 5 von 5
  • Konferenzbeitrag
    A method for the constrained interpolation of RLE-compressible chemical weather heatmaps
    (Proceedings of the 28th Conference on Environmental Informatics - Informatics for Environmental Protection, Sustainable Development and Risk Management, 2014) Epitropou, Victor; Karatzas, Konstantinos; Kukkonen, Jaakko; Karppinen, Ari
    Chemical Weather (CW) and other geospatial environmental information produced by numerical models are often published on-line in the form of heatmaps which have undergone several lossy processing and transformation steps, resulting in a relatively low visualization and recoverable data, compared to the model data which generated them,. In this paper, a method which is finetuned to the partial reconstruction of such chemical weather data starting from discrete-level heatmaps is presented, which relies on the augmentation of ordinary interpolation methods through the use of peak-limiting functions and other constraining methods.
  • Konferenzbeitrag
    ENV-e-CITY Environmentally Viable Electronic City
    (Environmental Communication in the Information Society - Proceedings of the 16th Conference, 2002) Moussiopoulos, Nicolas; Bøhler, Trond; Fedra, Kurt; Friedrich, Rainer; Karatzas, Kostas; Karppinen, Ari; Kraggerud, Per Haavard; Kukkonen, Jaakko; Larssen, Steinar; de Leeuw, Frank; Lohmeyer, Achim; Peinel, Gertraud; Pulles, Tinus; Reis, Stefan; Rose, Thomas; van der Hout, Dick
    The objective of project ENV-e-CITY is to develop an on-line application for environmental information related services. The e-content domain extends over four application areas: air emission, air quality, topography and meteorology. The application framework to be developed includes metadata structures for all application areas, export and import filters, interfaces and various e-content basic services. The user community of the platform envisaged consists of city authorities, consultants involved in environmental impact assessment studies and citizens desiring valid information on the state of the environment. An electronic market place for the e-content itself and the services is also envisaged.
  • Konferenzbeitrag
    Environmental Services and Data Brokerage Portal: ENV-e-CITY in Action
    (The Information Society and Enlargement of the European Union, 2003) Moussiopoulos, Nicolas; Karatzas, Kostas; Endregard, Geir; Fedra, Kurt; Friedrich, Rainer; Johansen, Per Henrik; Kalognomou, Liana; Karppinen, Ari; Kraggerud, Per Haavard; Kukkonen, Jaakko; Larssen, Steinar; de Leeuw, Frank; Lohmeyer, Achim; Naneris, Chris; Nicklass, Daniel; Papaioannou, Giannis; Peinel, Gertraud; Pulles, Tinus; Reis, Stefan; Rose, Thomas; Sedlmayr, Martin; van den Hout, Dick
    ENV-e-CITY is a European Commission supported e-content project that aims to develop an internet-based service for environmental information related applications. The motivation of this project lies in the need of European cities to perform assessments for complying with the EU environmental legislation, as well as the requirement for efficient environmental impact assessments. The e-content domain considered extends over four environmental application areas: air emission, air quality, topography, and meteorology. The application framework includes meta-data structures for these domains, export and import filters, interfaces and typical e-content services. The user community of the platform envisaged consists of city authorities, consultants involved in environmental impact assessment studies as well as citizens desiring valid information on the state of the atmospheric environment. An initial set of electronic information services is currently under development and will be demonstrated on the basis of the various user categories.
  • Konferenzbeitrag
    Involving the Expert in the Delivery of Environmental Information from the Web
    (Proceedings of the 27th Conference on Environmental Informatics - Informatics for Environmental Protection, Sustainable Development and Risk Management, 2013) Wanner, Leo; Bosch, Harald; Vrochidis, Stefanos; Bouayad-Agha, Nadjet; Casamayor, Gerard; Johansson, Lasse; Karppinen, Ari; Moumtzidou, Anastasia; Kompatsiaris, Ioannis; Ertl, Thomas
    Automatic provision of accurate user need- and profile-tailored environmental information is of increasing demand. However, it is a challenging task with many facets. Among them is the difficulty to compile and cast into a formal representation all the expert knowledge needed to accurately and exhaustively acquire, assess and process the data in order to be able to reliably judge their relevance to the user and to produce an adequate summary and recommendations. Studies in Human-Computer Interaction show that both the satisfaction of the users with an application and the objective performance of a service increases if the users (in particular, experts) are assigned an active role in the system. Based on this insight, we propose a largely interactive environmental information acquisition and generation framework. The PESCaDO service involves the experts in four central tasks: (i) determination of criteria for the search of environmental nodes in the web; (ii) assessment of the relevance of the identified nodes; (iii) assessment of the quality of the data provided by the nodes, and (iv) selection of the content to be communicated to the user. Quantitative evaluations and user trials show that the performance of the system is good and the satisfaction with the service is high.
  • Konferenzbeitrag
    Pollen: A Challenge for Environmental Information Services
    (Environmental Informatics and Systems Research, 2007) Karppinen, Ari; Sofiev, Makhail; Siljamo, Pilvi; Kukkonen, Jaakko; Ranta, Hanna; Linkosalo, Tapio; Jäger, Siegfried; Rasmunssen, Alix; Nicklaß, Daniel; Wanner, Leo
    Diseases due to aeroallergens, such as rhinitis and asthma, are among major causes of loss of productivity and demand for healthcare. The adverse health effects of allergens can be significantly reduced by either pre-emptive medical measures or behavioural adaptation of the outdoor activity. However, their planning requires reliable allergy-related forecasts several days ahead. Such forecasts should include the start time of pollen season, expected pollen concentration, area of exposure to a particular pollen type, timing of the peak concentrations and durations of the high season. This paper presents a current status of the Finnish Pollen Forecasting system. The system has been already used for operational pollen forecasts during spring of 2007 and also the systematic re-analysis of historical periods is ongoing.