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Direction of a closed curve (line)?

Forum|Forum|8 years ago
May 19, 2017
4 replies
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+5

ireen
Contributor

I have to determine the direction of a closed curve (a line where start and endpoint are the same) because I want to derive a gpx in the right direction (clockwise) from the polyline. Is there a way to do this?

So I want to test if the polyline has a clockwise direction and, if not, reverse the direction.

I tried the Polylineanalyzer and the azimuthcalculator, but both don't give me a solution.

Best answer by takashi

Hi @ireen, I would try this.

LineCloser: Transform the curve to an area.
OrientationExtractor: Extract the orientation of the area.
GeometryCoercer (Geometry Type: fme_line): Restore the original curve.

Note that the orientation may not be extracted correctly when the curve has self-intersections.

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