柱坐标系zhuzuobiaoxi
又叫做半极坐标系。它是由平面极坐标系及空间直角坐标系中的一部分建立起来的。设OX,OY,OZ为空间直角坐标系中的坐标轴。P(x,y,z) 为空间任意一点，作PN垂直于平面OXY，点N为垂足。连接ON，令ON=ρ,∠XON=θ,NP-z，且规定0≤ρ<+∞,0≤0<2π,-∞
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