Logo des Repositoriums

Auflistung nach Autor:in "Lang, Stefan"

1 - 2 von 2
  • Konferenzbeitrag
    Object-oriented Image Processing in an Integrated GIS/Remote Sensing Environment and Perspectives for Environmental Applications
    (Umweltinformatik ’00 Umweltinformation für Planung, Politik und Öffentlichkeit, 2000) Blaschke, Thomas; Lang, Stefan; Lorup, Eric; Strobl, Josef; Zeil, Peter
    While remote sensing has made enormous progress over recent years and a variety of sensors now deliver medium and high resolution data on an operational basis, a vast majority of applications still rely on basic image processing concepts developed in the early 70s: classification of single pixels in a multi-dimensional feature space. Although the techniques are well developed and sophisticated variations include soft classifiers, subpixel classifiers and spectral un-mixing techniques, it is argued that they do not make use of spatial concepts. Looking at high-resolution images it is very likely that a neighbouring pixel belongs to the same land cover class as the pixel under consideration. Algorithms in physics or mechanical engineering developed over the last twenty years successfully delineate objects based on context-information in an image on the basis of texture or fractal dimension. With the advent of high-resolution satellite imagery, the increasing use of airborne digital data and radar data the need for context-based algorithms and object-oriented image processing is increasing. Recently available commercial products reflect this demand. In a case study, `traditional' pixel based classification methods and context-based methods are compared. Experiences are encouraging and it is hypothesised that object-based image analysis will trigger new developments towards a full integration of GIS and remote sensing functions. If the resulting objects prove to be `meaningful', subsequent application specific analysis can take the attributes of these objects into account. The meaning of object dimension is discussed with a special focus on applications for environmental monitoring.
  • Konferenzbeitrag
    The GEOSS - ENERGEO portal: towards an interactive platform to calculate, forcast and monitor the environmental impact of ernergy carriers
    (Integration of Environmental Information in Europe, 2010) Blaschke, Thomas; Mittlböck, Manfred; Biberacher, Markus; Gadocher, Sabine; Vockner, Bernhard; Hochwimmer, Barbara; Lang, Stefan
    The EU FP7 project ENERGEO is the official EU contribution to the worldwide Global Earth Observation System of Systems (GEOSS) and develops a strategy for a global assessment of the current and future impact of the exploitation of energy resources on the environment. It contributes to the GEO-tasks EN-07-02 and EN-07-03. In this four years project, a global observation strategy will be developed until mid 2013 to appropriately assess the impacts of the current and future transitions in energy-use on the environment by a combination of existing models, existing global datasets from which environmental indicators as well as existing and currently developed models capable of assessing and forecasting environmental impacts and costs of energy exploitation. This paper focuses on developing a distributed system following the GEOSS architecture recommendations. Standardized interfaces for information access (OGC/ISO Web-Map-Service, Web Feature Service and Web Coverage Service) and OGC web processing are utilized for the specific needs of stakeholders which will be incorporated through the GEOSS ‘Energy Community of Practice’.