Grid corrections : places where North American roads deviate from their otherwise logical grid lines in order to account for the curvature of the Earth. You could drive out there your whole life, de Ruijter realized, and not realize that certain stop signs and intersections exist not because of eccentric real estate deals, but because they are mathematical devices used to help planners wrap a rectilinear planning scheme onto the surface of a spherical planet.
In 1909, American architect and cartographer Bernerd J.S. Cahill published An Account Of A New Land Map Of The World (and at The Internet Archive), in which he described a novel way of projecting a map. [more inside]
MeFi's own Alan Taylor brings us another crop of stunning aerial imagery from Google Earth, inviting you to guess what you're looking at. Now with multiple choice! (previously)
What would happen if the earth stopped spinning? ArcGIS was used to perform complex raster analysis and volumetric computations and generate maps that visualize these results.
Our amazing planet. I could study this all day.
How's the weather? Is it polluted? Do you have plenty of rainforests? Send someone a Geography Information Postcard and tell them about where you live by filling out infographics. (via)
National Geographic has a special issue on Africa out this month. There's also their Africa resource site.
The Blue Marble... true color global imagery at 1km resolution.