Some Current Issues In Using Diffuse Large Datasets For Environmental Modelling In New Zealand
Issues arising from the application of the SPARROW regional regression modelling technique to fluxes on nutrients in New Zealand streams are discussed. These include model scale dependency, as reflected in changing the DEM scale, and the lack of compatibility and transportability of the associated software. Nevertheless, this spatial referencing technique is demonstrating considerable advantages, because it manies the considerable spatially-referenced datasets with measurements routinely made in waterbodies. This facilitates the explanation of the relative importance of contaminant sources and may even be useful as a predictive tool (e.g., in showing the consequences of changing the land-use).
Key wordsSpatially-referenced water quality nutrients regression scale GIS
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