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I'm keen to make some products to sell with map graphics printed on them. As these are physical products (eg tshirt etc) I don't want to include the attribution in the design.
Is there a good source of GIS data available for commerical use without attributions?
Most require some sort of attribution. I'm talking pretty basic data such as country outlines, road lines, but would also love contours, lakes etc.
Free of course would be good.
US property outlines can require attribution
one good option is http://www.naturalearthdata.com/, which is public domain
Natural Earth is a public domain map dataset available at 1:10m, 1:50m, and 1:110 million scales.
http://www.naturalearthdata.com/about/terms-of-use/
All versions of Natural Earth raster + vector map data found on this website are in the public domain. You may use the maps in any manner, including modifying the content and design, electronic dissemination, and offset printing.
No permission is needed to use Natural Earth. Crediting the authors is unnecessary.
you can also see this geojson packaging of the data described above: http://geojson.xyz/
