Beeldschermkartografie ten behoeve van multi-bron internet GIS

The quick rise of the possibilities of the internet has caused an increased use of Geographic Information Systems (GIS). Internet provides a platform to distribute geographical data. However, most of the current geographic sites are atlases and not GIS products, because they are short of possibilities for analysis, query and visualisation. A new development in internet GIS is the use of distributed sources: the user can make his choice between diverse datasources. Geographic data is currently delivered as the data itself and meta-data like format, projection, attribute-definition, actuality and accuracy (quality of the data). The metainformation enables the user to decide whether the data is suitable for the use in a GIS. The OpenGIS Consortium (OGC) is developing standards for interoperability of geographic data. In the case when multiple sources are used, the visualisation of the datasets can cause conflicts for there is no standard or direction for the graphical presentation of the data. Therefore, it's useful to make a distinction between the Digital Landscape Model (DLM) where the data itself is present, and the Digital Cartographic Model (DCM, in Dutch DKM) where the graphical presentation is described. For the use of an internet GIS, it is important that not only the DLM, but also the DKM is provided by the data source. When a combination of several DLM's is made, the use of an expert system is needed, which uses cartographic rules to determine the optimal presentation of this set of data, given the user's task and preferences. This Cartographic Expert System (CES, in Dutch KES) is aimed to accompany and advise the user in producing a cartographic decent product.GIS technologyCivil Engineering and Geoscience