So little by little, satellites refined our understanding of Earth's exact shape and this underlying geoid.

卫星一点一滴地提升了我对地球精确形状及其基础大地水准面的理解。

And they came up with this equation that describes the geoid's contours in incredible detail.

提出了这个方程，以令人难以置信的细节描述了大地水准面的轮廓。

The best lines up with the geoid.

最理想的情况是与大地水准面相吻合。

Their geoid models, helped them track the exact orbits of spacecraft and satellites, in turn, helped them create better maps of Earth.

的地球模型帮助精确追踪航天器和卫星的轨道，进而助力绘制更精准的地球地图。