1. Update on WFD feature coding
By Albrecht Wirthmann, GISCO, Eurostat

2. Structure of the presentation
Purpose of coding
Review of GIS guidance
Code application
Coding structure
Code segments
Summary of code segments
Implementation of coding

3. Purpose of feature coding
Identifiers for geographic features for the WFD
Link between national and European data
Topological coding
International codes for transboundary features
Comprehensive system
Functionality
Top down coding
Code management

4. GIS Guidance Precedence to unique codes MS#1#2…#22
MS = 2 character Member State identifier, ISO Alpha-2 country codes
#1#2…#22 = an up to 22 character feature code that is unique within the Member State.
Always upper case,
Characters only [A-Z] and [0-9]
Digits should be used

5. Features codes for identifying
River (sub) basins
(Main) River segments
Lakes
River water bodies
Lake water bodies
Coastal water bodies
Transitional Water bodies
Groundwater bodies
Artificial water bodies

6. Code segments Sea Region River Basin District River basin Entity Type
(Lake code segment)
Country
Unique String

7. Code Segment Sea Region
Identification of a sea region,
Eco Region for transitional and coastal waters
mandatory
One digit
Values 1-9

8. Code Segment Sea Region

9. Code segment RBD Commencement of Pfaffstetter coding
Covers entire territory
Common territorial breakdown
3 digits
Values 1-999

10. RBDs in Europe

11. Code segment River Basin
Identification of major catchment
Identification of the river basin
Pfafstetter code
1-9 digits
Values

12. Code segment River Basin

13. Code segment River Basin
Pfafstetter code
Start with longest flow path
Interbasins according to drainage area
1 to 1 relationship between sub-basin and river segment
Minimum size criterion for code application
Identification of reported features

14. Code segment River Basin

15. Code segment River Basin

16. Code segment River Basin
Lakes
Connected to river network
Pfafstetter code of outlet
Not connected to river network
Additional identifier before country code

17. Code segment River Basin
Connected
Lakes

18. Code segment River Basin22 23 24 26 25 27
Connected
Lakes
Lake waterbody code:
LW-SE AMMS
Lake waterbody code:
LW-SE WTMS 25 26 27
Lake code: LE-SE WTMS3902

19. Code segment River Basin
Code Lake A: LE-01-SE WTMS3902
Code Lake B: LE-02-SE WTMS 22 23 24 25 A B
Isolated
Lakes

20. Code segment Lake ID Isolated Lake Identifier
Optional segment for identifying lakes within a river basin
International lakes!
Insertion between entity type and country code
2 digits
Values: 1-99

21. Code segment Entity Type
Identification of coded feature
mandatory
2 characters
Values ..

22. Code segment Entity Type
Entity type Values
RB River Basin
RS River Segment
LE Lake
CW Coastal Water Body
TW Transitional Water Body
River Water Body
LW Lake Water Body
GW Ground Water Body
AW Artifical Water Body

23. Code segment Country Code
Distinction between international and national part of features
ISO 31-1 Alpha-2 code
2 characters

24. Code segment Unique String
Identification of features on national territory
Stable in time
Managed by Member State
Notification on change
GIS Guidance definition for minimizing implementation efforts
22 characters

25. Coding structure Monitoring stations Discharge points
Excluded features
Monitoring stations
Discharge points
Pollution sources
Protected Areas

26. Coding structure Coding of other features Country code Unique String
Hydrological code as foreign key

27. Summary of Code segments