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    Ruimtelijke interpolatie van NO- en NO2-concentraties en windsnelheden in Nederland voor 1992

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    Authors
    Dekkers ALM
    Type
    Onderzoeksrapport
    Language
    nl
    
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    Title
    Ruimtelijke interpolatie van NO- en NO2-concentraties en windsnelheden in Nederland voor 1992
    Translated Title
    Spatial interpolation of NO concentrations, NO2 concentrations and wind speed in the Netherlands in 1992
    Publiekssamenvatting
    De ruimtelijke verdeling van NO- en NO2-concentraties wordt verkregen door ruimtelijke interpolatie van de jaargemiddelden van concentraties gemeten op een beperkt aantal meetstations. Na een methodologische inleiding over medianpolish, medianpolish kriging en het simuleren van ruimtelijk afhankelijke velden, worden deze interpolatie-technieken op jaargemiddelde NO- en NO2-concentraties en op jaargemiddelde windsnelheden uit 1992 over Nederland toegepast. Enkele kentallen van de voorspelde concentraties en van de bijbehorende interne betrouwbaarheidsfactoren beschrijven de interpolatie resultaten. Tevens worden deze resultaten geografisch weergegeven op een 5x5 km rooster. Met cross-validatie wordt een benadering van de externe betrouwbaarheid van de median-polish kriging verkregen. Tenslotte worden de resultaten van de median-polish kriging voor de NO- en NO2-concentraties vergeleken met de resultaten van de tot nu toe gebruikte "afstandsinterpolatie".<br>
    The spatial distribution of NO and NO2 concentrations is obtained by spatial interpolation of yearly averaged measurements acquired at a small number of stations. After a methodological introduction of median polish, median-polish kriging and sequential simulation, these interpolation techniques are applied on yearly averaged NO and NO2 concentrations and on yearly averaged wind velocity measurements in the Netherlands. Some statistics of the concentration predictions and their internal confidence factors describe the results. These results are also given in a geographical way on a 5x5 km grid. The external confidence factor of median-polish kriging is approximated by cross-validation. Finally the median-polish kriging results on the NO and NO2 concentrations are compared with the results of "distance interpolation", the interpolation method used to date.<br>
    Publisher
    Rijksinstituut voor Volksgezondheid en Milieu RIVM
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    RIVM
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