The radial-tracing algorithm and the effective earth model are discussed.

讨论了大气折射的射线追踪算法和等效地球模型；

youdao

The main factors which affect the earth resistance are the earth model and parameters where the grounding body is buried.

影响电力系统接地电阻的主要因素是接地体所在土壤的模型及参数。

youdao

The new revision method basically has resolved the problems of "Plane Earth Model" and has improved the accuracy of well survey calculation.

从根本上解决了常规测斜计算中“平面地球”模型所带来的不足，进一步提高了测斜计算的精度。

youdao

This is a special type of Earth model which traces its idealised "horizontal" surface - the plane on which, at any point, the pull of gravity is perpendicular to it.

BBC: Europe's Goce satellite probes Earth's gravity

This allows the designers to type in the latitude and longitude of any place on Earth and realistically model the landscape.

FORBES: SSX Shreds In Stunning Detail

Unfortunately, the earth's circumference at the equator is almost 25, 000 miles, so when we try to model the entire earth, and go up into the mesosphere (about 25 to 50 miles above the earth) the picture gets fuzzier.

CNN: Can you trust the weatherman?