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.
2
最后提出了当三轴椭球面接近于球面时其面积的一个相当准确的近似表达式。
Finally, a rather precise, approximate formula for the area of the 3 axes ellipsoid when it tends to sphere is proposed.
3
推导出用三顶点的测地坐标计算地球椭球面上三角形面积的公式。
The formula for area of triangle on ellipsoid by means of geodesic coordinate is derived in this paper.
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