" Crop marks are a means through which sub-surface archaeological, natural and recent features may be visible from the air or a vantage point on higher ground or a temporary platform" via migurski

"geoid is that equipotential surface which would coincide exactly with the mean ocean surface of the Earth, if the oceans were in equilibrium, at rest, and extended through the continents (such as with very narrow canals)" interesting imaginary state of earth used for mathematical calculations

"intended to be used for ANY purpose that is representative of Humankind as a whole, and not connected to any country, organization, or individual"; the design is what it is

new video

hi-rez photos and videos of assorted earth visualizations; I like seeing worthy examples of "that's where my taxes go"