Auxiliary Euro-Calliope datasets: Spatial data to represent a European energy system model at several spatial resolutions

Main output generated with the custom-region possibility-for-electricity-autarky workflow.

This output provides similar data to https://doi.org/10.5281/zenodo.3246302 (technically eligible land area for renewables and other spatially disaggregated energy system data), but with two key differences:

1. The spatial extent has been expanded to include Iceland.
2. Two new spatial resolutions have been added: `ehighways` and `ehighways_disaggregated`.

`ehighways` defines 98 regions based on the result of work undertaken in the European Commission Seventh Framework Programme project e-HIGHWAY 2050 [1]. The regions cover 35 European countries; 19 are described at a national resolution and the rest at a subnational resolution. Those at a subnational resolution are aggregated from NUTS3-2006 statistical units. `ehighways_disaggregated` provides the data at the resolution of statistical units in Europe, which is then aggregated to produce the data at the `ehighways` resolution. The mapping from statistical units to ehighways regions is defined in `./ehighways/statistical_units_to_ehighways_regions.csv`. `./ehighways/units.png` shows a map of the resulting 98 `ehighways` regions. The region colours are used to help differentiate regions and have no other meaning.

This dataset is used as an input to the Sector-Coupled Euro-Calliope workflow.

[1] Anderski, T., Surmann, Y., Stemmer, S., Grisey, N., Momot, E., Leger, A.-C., Betraoui, B., and van Roy, P. (2014). European cluster model of the Pan-European transmission grid (e-HIGHWAY 2050)