接線スパイラル曲線をどのように近似できますか？

LyonMNGIS

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こんにちは、<\/P>

私たちはparcel fabricで接線スパイラル曲線を描く必要があります。しかし、少なくともArcGIS 10.3のparcel fabricでは接線スパイラル曲線を描くことができないようです。その間に：<\/P>

• 接線スパイラル曲線を近似するにはどう始めればよいでしょうか？<\/LI>
• 接線スパイラル曲線の開始および終了のXY座標を計算するツールはありますか？そうすれば、少なくとも残りのparcelを正確に描き、その後ESRIが接線スパイラル曲線の描画を許可したときに曲線に戻ることができます。<\/LI><\/UL>

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  ありがとうございます<\/P><\/BODY><\/HTML>

JeffWard

There was a post a few years ago about spiral curves and Tim Hodson​ replied asking how much interest there would be in Esri providing this capability.  Apparently there wasn't enough interest at the time.  From what I read on that post some folks are just using the chord in place of the spiral curve.  But to do that you would still need to be able to calculate where the spiral ends.  I bought a couple of the ebooks at this site and I am able to calculate the endpoint of the spiral using the formulas, but not quickly or easily.

What would be nice is if there were a tool that would calculate the chord bearing and the chord length of the spiral curve at least until Esri can get the capability into the traverse grid.