Quantifying urban, industrial, and background changes in NO2 during the COVID-19 lockdown period based on TROPOMI satellite observations
Vitali Fioletov et al.
The Gridded Population of the World (GPW) https://sedac.ciesin.columbia.edu/data/collection/gpw-v4
ERA5: Fifth generation of ECMWF atmospheric reanalyses of the global climate https://www.ecmwf.int/en/forecasts/datasets/reanalysis-datasets/era5
2-Minute Gridded Global Relief Data (ETOPO2v2) https://www.ngdc.noaa.gov/mgg/global/etopo2.html