1. Reference data sets, centroids, scales, codes, river stretches… A proposal for visualisation in WISE
Jorge Rodriguez Romero, Violeta Vinceviciene DG ENV unit D.2 GIS workshop: January 2008, Dublin

2. Aggregation level (areal) Hydrological features Coding system-
EU level
Large rivers >5000 km2
National
Main rivers >500 km2
Scale
Code-Rivers
RBD
MS working scale (or CCM2)
>10 to >100 km2
Sub-units +
Code-WBs
Water bodies
Code-point info
Point info

3. The proposal
Reference dataset main rivers (catchment >500 km2) should be the EU-wide, homogeneous basis of visualisation
River water bodies on main rivers should be presented as stretches, not as points
We should have information of all water bodies to be included in sub-unit or RBD statistics
Various datasets should be connected through coding

4. The proposal
Reference dataset main rivers (catchment >500 km2) should be the EU-wide, homogeneous basis of visualisation
River water bodies on main rivers should be presented as stretches, not as points
We should have information of all water bodies to be included in sub-unit or RBD statistics
Various datasets should be connected through coding

5. Main rivers should be the EU-wide, homogeneous basis of visualisation
Main rivers (>500 km2)
Additional rivers at MS working scale (e.g. >100 km2)

6. Main rivers should be the EU-wide, homogeneous basis of visualisation
Main rivers will be the only EU-wide, homogeneous, connected river network and will be the least common denominator for visualisation (this we should have for all!)
The basis of main rivers: article 3 submissions

7. Article 3 current status
Main rivers should be the EU-wide, homogeneous basis of visualisation
Article 3 current status
Article 3 minus rivers <500 km2

8. The proposal
Reference dataset main rivers (catchment >500 km2) should be the EU-wide, homogeneous basis of visualisation
River water bodies on main rivers should be presented as stretches, not as points
We should have information of all water bodies to be included in sub-unit or RBD statistics
Various datasets should be connected through coding

9. Water bodies on main rivers should be presented as stretches¿? ¿?
Water bodies? ¿?

10. Water bodies on main rivers should be presented as stretches

11. Centroids + river network Centroids + river stretches
Water bodies on main rivers should be presented as stretches
WHAT DO WE HAVE NOW AS WATER BODIES:
Centroids only
Centroids + river network
Centroids + river stretches

12. Water bodies on main rivers should be presented as stretches
IN ADDITION, WHAT IS A CENTROID?
From ESRI GIS dictionary:

13. Water bodies on main rivers should be presented as stretches
ARTICLE 5 CENTROIDS: WIDE BIODIVERSITY
RBD -x
midpoint
RBD -y:
????
RBD -z:
????????????
Midpoint used in several MSs

14. The proposal
Reference dataset main rivers (catchment >500 km2) should be the EU-wide, homogeneous basis of visualisation
River water bodies on main rivers should be presented as stretches, not as points
We should have information of all water bodies to be included in sub-unit or RBD statistics
Various datasets should be connected through coding

15. Information of all water bodies to be included in sub-unit or RBD statistics

16. Information of all water bodies to be included in sub-unit or RBD statistics
15 water bodies?
35 water bodies!

17. Necessary to produce such nice maps:
Information of all water bodies to be included in sub-unit or RBD statistics
Necessary to produce such nice maps:

18. The proposal
Reference dataset main rivers (catchment >500 km2) should be the EU-wide, homogeneous basis of visualisation
River water bodies on main rivers should be presented as stretches, not as points
We should have information of all water bodies to be included in sub-unit or RBD statistics
Various datasets should be connected through coding

19. Various datasets should be connected through coding
Coding is essential to answer basic questions
To which river belongs this water body?
To which water body belongs this monitoring station?
This CANNOT be answered adequately by geographical operations, i.e. xy coordinates are not sufficient
In implementing the coding we should take into account:
In the future we should aim at developing more detailed main rivers reference dataset (e.g. from >500 to >100 km2)
This means it would be advantageous to have the coding implemented in a very detailed dataset: CCM2
Is it possible to transfer the coding from CCM2 to main rivers through spatial overlay?

20. Summary of the proposal
Do not use centroids to visualise water bodies
Main rivers should be the least common denominator for visualising
This means we need, as a minimum, river stretches for main rivers
All water bodies should also be reported as centroids for allowing sub-unit, RBD or national analysis
If any MS reports more detailed data on river stretches, that is very welcome and can be displayed in WISE viewer beyond a certain zoom in (but these water bodies will be disconnected across the borders)
Coding is essential and should be implemented
On the same basis, future enhancements of WISE can enlarge the scale of main rivers (e.g. from >500 to >10 km2)