1. Evaluation of CCM river and catchment database
By Albrecht Wirthmann, GISCO, Eurostat
12/5/2004

2. Purpose Evaluation of CCM river and catchment database
Integration into GISCO reference db
Usage as reference dataset for WFD

3. Data Description Digital Elevation model 100 – 250 – 1000m resolution
Surface water areas CORINE land cover, GISCO lakes (1:3 Mill.), PELCOM 1000m
Climate data, vegetation cover, soil, lithology

4. Extent

5. Characteristics

6. CCM and WSEU1M

7. CCM and EuroGlobalMap

8. Entella catchment

9. Positional Accuracy Comparison of point locations
Usage of reference data set
Random selection of points
Min. of 20 points
Determination of distortions
Calculation of Root Mean Square Error
Calculation of Accuracy

10. General considerations
No reference data set for catchments
Coincidence of river confluences with catchment boundaries

11. Applied method IMAGE 2000 as reference data set
Random Selection of river nodes with EuroGlobalMap network
Comparison of node locations of CCM and IMAGE 2000

12. Method

13. Random nodes

21. Results

22. Results

23. Conclusions Only catchment dataset on European level
CCM resolution superior to WSEU1M
CCM more accurate as WSEU1M
CCM river network more dense than EGM
Total Accuracy: 2662m, 1: 2,5 Mill.
Resolution: Mean size 21km², 1: 500,000
Problems of delimitation in flat areas

24. Conclusions Usage as reference for major catchments
Problems with accuracy of river courses
Systematic validation and correction necessary
Integration of existing hydrographic network