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Standard Parallel and Secant Parallel in Azimuthal Projections

Miljenko Lapaine

Abstract


It is commonly assumed that standard parallels and parallels that appear as the intersections of a developable surface and a sphere or ellipsoid coincide. This paper shows that this is not true of azimuthal projections which are equidistant along meridians, equidistant along parallels (orthographic), and equal-area, because there is no standard parallel at all in such projections. Only some azimuthal conformal (stereographic) projections have standard parallel, in which case it coincides with secant parallel.

Keywords


map projection, azimuthal projection, standard parallel, secant parallel

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Copyright (c) 2018 Miljneko Lapaine

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