earthRadius
描述
¥Description
地球半径（以公里为单位）。用于将地球建模为球体的 Turf 模块。之所以选择 平均半径，是因为它根据半正矢公式（turf/distance 使用）与 recommended 相等，从而可以减少误差。
¥The Earth radius in kilometers. Used by Turf modules that model the Earth as a sphere. The mean radius was selected because it is recommended by the Haversine formula (used by turf/distance) to reduce error.
值
¥Value