Conceptual diagram of data harmonization process. JRC Water area was calculated in Google Earth Engine (GEE), and then aggregated locally within the R environment. Similarly, basin population was calculated on GEE, and then aggregated locally within the R environment. Climate data from MERRA-2, however, was first aggregated from hourly to monthly and annual values, then resampled for 1/10th of their original resolutions with a subsequent and raster clipping was performed within the R environment. We then imported the geotiff outputs to GEE to calculate basin climate variables. GEE output was then downloaded locally and aggregated within the R environment.