The Grand Canyon map was the largest and most time-consuming relief map Tóth worked on during his 22 years at National Geographic. By his account, it took 1,074.5 hours to paint it.

Video produced by ASU Now.. Further Reading. Take a close-up look at historic maps of the Grand Canyon from ASU Libraries, the Library of Congress, and more.; Read about the history of charting the ...

First complete topographic map of Mercury reveals plains, ... Mercury’s highest point, ... 5.38 kilometers below average — over three times the average depth of the Grand Canyon.