polyconic projection การใช้

NOAA uses the polyconic projection for some of its charts of the Great Lakes, at both large and small scales.
As a specific projection, the American polyconic projection is conceptualized as " rolling " a cone tangent to the Earth at all parallels of latitude, instead of a single cone as in a normal conic projection.
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.