在地图等积投影中，椭球面梯形面积的正、反算方法和精度是关键。
In order to satisfy the requirement of high precision in map equiareal projection, the precise forward and inversion formulas of ellipsoid trapezoid area are studied out according to the basic theory.
在地图等积投影中，椭球面梯形面积的正、反算方法和精度是关键。
In order to satisfy the requirement of high precision in map equiareal projection, the precise forward and inversion formulas of ellipsoid trapezoid area are studied out according to the basic theory.
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