每个点都应该通过一条线连接到下一个点上。
Each point should be connected to the next in series by a line.
一条在地球表面上连接磁偏为零的点的假想线。
On the Earth's surface where the magnetic declination is zero.
连接曲线或多段线的第一点与最后一点。
Connect the first point of a curve or polyline with the last one.
连接曲线或多段线的第一点与最后一点。
Connect the first point of a curve or polyline with the last one.
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