index ellipsoid

例句：

1. 1. The index ellipsoid is used to measure the distance between two points on a surface.
   索引椭球体用于测量两个点在表面上的距离。
2. 2.The shape of the index ellipsoid affects how we can measure the size and position of objects.
   索引椭球体的形状影响我们如何测量物体的大小和位置。
3. 3.In this study, we used the index ellipsoid to calculate the distance between two points on the Earth's surface.
   在这项研究中，我们使用索引椭球体来计算地球表面两点之间的距离。