Abstract
This chapter focuses on the creation of the common European Water Data Reference System. Water bodies classified as performing poorly with respect to their ecological status can be the subject to specific measures of the Union, thus allowing authorities to have clean and sufficient water resources. Europe has heterogeneous and rich geographical data sources. For decision-makers at continental level, information of comparable quality is highly desired, to assess the progress of the implementation of the directive. Various methods have been developed to create a geometric reference using data originating from space called space born data. Space data allows both for detection of surface water bodies and for the detection of height of the surface. Space born data can also be used to detect oil slicks or sudden growth of algae in the summer season. The main geographic reference data to be created are water bodies like streams, channels, canals, tidal areas, and swamps. The geometric reference consists of various components. Some of them can be detected automatically using space born data.
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