Standard parallel(s) (line of constant latitude at which the surface of the Earth and the plane intersect), when subfield $a contains the text Albers conical equal area, Equidistant conic, Equirectangular, Lambert conformal conic, Mercator, or Polar stereographic. Oblique line latitude(s) (latitude of a point defining the line along which the projection is centered), when subfield $a contains the text Oblique Mercator. Vertical coordinate system. Map projection.
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