SWECO25: Hydrologic (hydro)

The hydrologic category contains the "gwn07", "morph", and "swisstopo" datasets. 

The gwn07 dataset provides information on the distance to the hydrological network (rivers and lakes). After rasterizing and resampling the source data (Swisstopo, 2007) to the SWECO25 grid, we generated distance statistics layers for the 9 (and all together) Strahler River order and 3 (and all together) lake size classes that were available. This dataset includes a total of 14 layers. Final values were rounded and multiplied by 100. 

The morph dataset describes the ecomorphology of the Swiss rivers and streams. After rasterizing and resampling the source data (FOEN, 2009) to the SWECO25 grid, we generated individual layers for the 5 ecomorphological classes that were available (natural/near-natural, little disturbed, heavily disturbed, unnatural/artificial, and culverted). For each class, we provided the binary maps (0 or 1) and computed 13 focal statistics layers by applying a cell-level function calculating the average percentage cover value for a given class in a circular moving window of 13 radii ranging from 25m to 5km. This dataset includes a total of 71 layers. Final values were rounded and multiplied by 100.

The swisstopo dataset describes the steepness of the watercourses. After rasterizing and resampling the source data (Kaelin and Altermatt, 2016) to the SWECO25 grid, we generated two main layers, for the maximum and mean values. For each, we provided the output map and 13 focal statistics layers obtained by applying a cell-level function calculating the average value in a circular moving window of 13 radii ranging from 25m to 5km. This dataset includes a total of 28 layers.  Final values were rounded and multiplied by 100.

The detailed list of layers available is provided in SWECO25_datalayers_details_hydro.csv and includes information on the category, dataset, variable name (long), variable name (short), period, sub-period, start year, end year, attribute, radii, unit, and path.

References: Swiss Federal Office of Topography [swisstopo]. Hydrographic network VECTOR25 GWN07. (Wabern, Switzerland, 2007).

Federal Office for the Environment [FOEN]. Swiss watercourse structure and morphology. (Bern, Switzerland, 2009)

Kaelin, K. & Altermatt, F. Landscape-level predictions of diversity in river networks reveal opposing patterns for different groups of macroinvertebrates. Aquatic Ecology 50, 283-295 (2016) 

Külling, N., Adde, A., Fopp, F., Schweiger, A. K., Broennimann, O., Rey, P.-L., Giuliani, G., Goicolea, T., Petitpierre, B., Zimmermann, N. E., Pellissier, L., Altermatt, F., Lehmann, A., & Guisan, A. (2024). SWECO25: A cross-thematic raster database for ecological research in Switzerland. Scientific Data, 11(1), Article 1. https://doi.org/10.1038/s41597-023-02899-1

V2: metadata update