Conical projection - Conical projection

Japanese: 円錐図法 - えんすいずほう（英語表記）conical projection

A general term for map projections in which meridians on a map are bundles of straight lines emanating from a fixed point, and parallels are concentric circles centered on the fixed point, in the form of a polar coordinate network. It is equivalent to using a cone with the Earth's axis as the projection surface. The 1st standard parallel cone projection (when the cone is in contact with the Earth) is also called the tangent cone projection, and the 2nd standard parallel cone projection (when the cone intersects with the Earth) is also called the secant cone projection. In a conic projection, the lines of equidistortion coincide with the latitudes, and the distortion of the map projection is equal on each latitude. When the intervals between the latitudes on a map are equal, the distance is accurately represented on the meridians, and it is called an equidistant conic projection. When it is a tangent cone, it is called the Ptolemy conic projection or the simple conic projection, and when it is a secant cone, it is called the Deliel projection. When it is an equal-area projection, when it is a tangent cone, it is called the Lambert equal-area conic projection, and when it is a secant cone, it is called the Albers projection. The conformal projection is called the Lambert Conformal Conic Projection. (→ Pseudoconic projection, Polyconic projection, Lambert projection)

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

地図上の経線が一定点から放射する直線束となり，緯線がその定点を中心とする同心円となる極座標網の形に表わされる地図投影法の総称。地軸を軸とする円錐を投影面とすることに相当する。1標準緯線円錐法 (円錐が地球に接する場合) を接円錐図法，2標準緯線円錐図法 (円錐が地球と交わる場合) を割円錐図法ともいう。円錐図法では等ひずみ線が緯線と一致し，緯線ごとにその上では地図投影のひずみが等しい。地図上の緯線の間隔が等しくなる場合は経線上で距離が正確に表わされ，正距円錐図法という。接円錐のときをトレミー円錐図法または単円錐図法，割円錐のときをドリール図法という。正積図法の場合に接円錐のときをランベルト正積円錐図法，割円錐のときをアルベルス図法という。正角図法の場合をランベルト正角円錐図法という。 (→擬円錐図法 ,　多円錐図法 ,　ランベルト図法 ) 　

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