The dataset consists of a series of NetCDF files ?for each combination of RCM (REMO or RegCM), input data (sftimf or sfturf) and city´ containing grid-point values of 0, 1, or NaN, representing rural, urban, or unclassified cells, respectively. For the European cities, two separate files were generated for CORDEX-CORE and CORDEX-EUR-11 at a 25 and 12.5 km of horizontal resolution, respectively. The native map projections of each RCM are preserved, and the NetCDF files also include the hyperparameters used in the algorithm (see the Section "Methods").-- Filenames and NetCDF metadata are formatted to follow the CORDEX archive specifications65 and the CF metadata conventions. Each filename includes the following fields, separated by underscores: "urmask" (Urban/RuralMASK) variable including input data (sftimf or sfturf depending on the input data used), CORDEX domain including city, driving GCM, experiment, ensemble member, RCM institution, RCM model name, and frequency. For example, the filename for REMO, CORDEX-EUR-11, and London is: urmask-sftimf_EUR-11-London_ECMWF-ERAINT_evaluation_r1i1p1_GERICS_REMO2015_fx.nc. Figure 1 shows a snapshot of the contents of this example, including the hyperparameters used during its generation.

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