#### Maps

Blue Marble Next Generation (500 m / pixel)
NASA Goddard Space Flight Center Earth Observatory http://earthobservatory.nasa.gov/Newsroom/BlueMarble/

Earth's City Lights
Data courtesy Marc Imhoff of NASA GSFC and Christopher Elvidge of NOAA NGDC. Image by Craig Mayhew and Robert Simmon, NASA GSFC.

Shuttle Radar Topography Mission (SRTM30, 1 km / pixel )
NASA Jet Propulsion Laboratory http://www2.jpl.nasa.gov/srtm/

Micro World Data Bank in Polygons ("MWDB-POLY / MWDBII")
CIA ; Global Associates, Ltd.; Fred Pospeschil and Antonio Rivera

Temperature and Precipitation Maps (July and December)
A combination of two datasets:

- Legates, D.R. and Willmott, C.J. 1989. Average Monthly Surface Air Temperature and Precipitation. Digital Raster Data on a .5degree Geographic (lat/long) 361x721 grid (centroid-registered on .5 degree meridians). Boulder CO: National Center for Atmospheric Research. http://www.ngdc.noaa.gov/ecosys/cdroms/ged_iia/datasets/a04/lw.htm
- CRU CL 2.0: New, M., Lister, D., Hulme, M. and Makin, I., 2002: A high-resolution data set of surface climate over global land areas. Climate Research 21. http://www.cru.uea.ac.uk/cru/data/hrg

#### Street Map

OpenStreetMap
The street maps used in Marble via download are provided by the OpenStreetMap Project ("OSM"). OSM is an open community which creates free editable maps. License: OpenStreetMap data can be used freely under the terms of the Creative Commons Attribution-ShareAlike 2.0 license.

#### Cities and Locations

World Gazetteer
Stefan Helders http://www.world-gazetteer.com

Geonames.org
http://www.geonames.org/ License: Geonames.org data can be used freely under the terms of the Creative Commons Attribution 3.0 license.

Czech Statistical Office
Public database http://www.czso.cz

#### Flags

Flags of the World
The flags were taken from Wikipedia (http://www.wikipedia.org) which in turn took a subset from http://www.openclipart.org and reworked them. All flags are under the public domain (see comments inside the svg files).

#### Stars

The Bright Star Catalogue
5th Revised Ed. (Preliminary Version) Hoffleit D., Warren Jr W.H., Astronomical Data Center, NSSDC/ADC (1991) http://adc.gsfc.nasa.gov