Common Implementation Strategy for the Water Framework Directive

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WFD CIS Guidance Document No.9 Implementing the Geographical Information Systems (GIS) of the Water Framework Directive Figure 3.3.1: Water Bodies and Management Units. Figure 3.3.2: Water Bodies and Monitoring. 24
WFD CIS Guidance Document No.9 Implementing the Geographical Information Systems (GIS) of the Water Framework Directive Geometric Representation Figure 3.3.3: Water Bodies and Status. In the simple approach presented here, features are represented as simple features only (i.e. points, lines, or polygons). Optionally, the same set of real world features could be modeled as a simple or complex network. Since the main objective of the Directive is reporting, not analysis, this may not be a priority, but should not be excluded at this stage and is discussed further below. Linear measuring systems are in use in some, but not all, Member States. Instead of explicit x,y locations, data are recorded with reference to relative positions according to a known feature. For example, river segment 2800, kilometer 23.1 identifies a position in geographic space without the use of x,y co-ordinates. Because such measurements refer to relative positions, they can be updated easily without having to edit the underlying geometry of the river network. Whilst this may become a standard approach in the future, the current release of the model provides a simple feature based approach. Thus, in the case of river lines, any status categorization (for example, poor quality symbolized in red) will apply to the entire line feature, from node to node. The identification and representativity of the segments is therefore crucial, and presents problems if the status values are dynamic. Given that reporting is on a six yearly basis, this problem is not significant. Clearly it is the Member States responsibility 25
Page 1 and 2: European Commission Common Implemen
Page 3 and 4: Foreword The EU Member States, Norw
Page 5 and 6: 3.3.3 Data Model Overview..........
Page 7 and 8: 5.5 RECOMMENDATIONS RESULTING FROM
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Common Implementation Strategy for the Water Framework Directive

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