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回転楕円体面上の二点間距離を求める計算(Bowring (1996))の改善

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Last updated at Posted at 2026-02-02

こんにちは。
回転楕円体面上の二点間距離を求める Bowring (1996) の計算方法は全球で高精度ですが1

しかしながら、率直に実装し浮動小数点計算すると、対蹠点近傍で j1 > 1 が起き NaN が生じる場合があり、最小限改善しました。

  1. 参考:二点間測地線距離(地球上):各計算方法の誤差評価

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