From EFAS 5 and GloFAS 4, the high-resolution CEMS_SurfaceFields_2022 dataset used to drive LISFLOOD for download from the JRC Data Catalogue–global 3 arc min: https://data.jrc.ec.europa.eu/dataset/68050d73-9c06-499c-a441-dc5053cb0c86; over Europe 1arc min: https://data.jrc.ec.europa.eu/dataset/f572c443-7466-4adf-87aa-c0847a169f23.

Spatial resolution

Accurate representation of the rainfall-runoff processes in different climatic and socio-economic contexts requires a set of maps showing the morphological, pedological, vegetation, and land use characteristics of the catchments. The spatial resolution of the GloFAS v4 system is 0.05 degrees, and of EFAS v5 is 1 arcmin, which is four and 14 times higher than the previous GloFAS and EFAS systems, respectively. The higher resolution allows a more detailed representation of the river network and of the spatial variability of catchments’ characteristics. 

The benefits of using a higher spatial resolution can be appreciated in Figure 1: smaller tributaries can be adequately represented when using the 0.05 degrees.

Figure 1 - River network at 0.1 degrees resolution (left) and 0.05 degrees resolution (right): drainage upstream area with increasing values from 50 km2  represented with colours from blue to yellow. The HydroRIVERS dataset is used as reference. 

Reference datasets

The CEMS-Flood surface field dataset was created using reference datasets including remote sensing and in-situ datasets. Examples include the latest land cover information and leaf area index layers from the Copernicus Global Land Service, global hydrology datasets based on MERIT Hydro, and global soil data from ISRIC.

The complete list of source data and a detailed description of the methodology used to produce each map dataset is available here., with a full description of the data source and workflow provided in Choulga et al (submitted).

References

[1] Choulga, Moschini, Mazzetti, Grimaldi, Disperati, Beck, Salamon, and Prudhomme. “ Technical note: Surface fields for global environmental modelling”. Submitted for publication to HESS, MS type: Technical note