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The American Polyconic projection is a map projection conceptualized as "rolling" a separate cone tangent to the Earth at each parallel of latitude, rather than a single cone as in a normal conic projection. Each parallel is a circular arc of true scale. The scale is also true on the central meridian of the projection. This projection was in common use by many map-making agencies of the United States from the time of its proposal by Ferdinand Rudolph Hassler in 1825 until the mid-20th century. Map: Strebe, using Geocart Recently featured:
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from Wikipedia picture of the day feed http://ift.tt/29qoAc2
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