BlueSpray includes the following data from freely available sources:

Natural Earth (www.naturalearthdata.com):
- 10m-admin-0-countries - original file from Natural Earth
- countries_simplified - processed by BlueSpray from 10m-admin-0-countries
- 110m_populated_places_simple - process by BlueSpray from 110m_populated_places
- 10m_rivers_lake_centerlines - original file from Natural Earth

NASA (earthobservatory.nasa.gov)
- bluemarble320_160_2 - processed by BlueSpray from NASA's BlueMarble dataset
- bluemarble1280_640 - processed by BlueSpray from NASA's BlueMarble dataset
- bluemarble5400_2700 - processed by BlueSpray from NASA's BlueMarble dataset
- land_ocean_ice - processed by BlueSpray from NASA's Visible Earth website

NOAA's National Geophysical Data Center (ngdc.noaa.gov)
- etopo1_ice_16bit_signed - various resolutions of a 16-bit version of the ETOPO ice dataset
- GlobalElevation - 32-bit version of the ETOPO elevation data
