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。
Every map projection distorts distance, area, shape, direction, or some combination thereof.
每个地图投影都弯曲距离、面积、形状、方向或它们的组合。
Every map projection distorts distance, area, shape, direction, or some combination thereof.
每个地图投影都弯曲距离、面积、形状、方向或它们的组合。
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