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Hi,

I am trying to calculate the width from a polygon at point feature locations (see figure). I was thinking about creating perperdicular linen at the point feature locations (perpendicular to polygon). Clipping the perpendicular lines (using the polygon as clipper) and calculating the length of the perpendicular lines.

Is there an easier way to do this?

Kind regards

Michael

That's how I would do it!

Hi @michael_pieters, if you can assume that left-side boundary and right-side boundary at a section of the road-like polygon are approximately parallel, this could be a solution.

  1. NeighborFinder (inside point -> Base, polygon -> Candidate): Find a point on the boundary of the polygon, which is closest to the given inside point.
  2. VertexCreator (Mode: Add Point): Create a line segment connecting the point output from the Matched port (i.e. a given inside point) and the closest point on the polygon boundary (_closest_candidate_x, _closest_candidate_y).
  3. LineExtender (called Extender in FME 2016 and earlier): Extend the line segment so it crosses both left-side boundary and right-side boundary of the polygon.

  4. Clipper: Clip the extended line by the polygon.

  5. LengthCalculator: Compute the length of the clipped line. The result would be the approximate width at the section.

Hi @michael_pieters, if you can assume that left-side boundary and right-side boundary at a section of the road-like polygon are approximately parallel, this could be a solution.

  1. NeighborFinder (inside point -> Base, polygon -> Candidate): Find a point on the boundary of the polygon, which is closest to the given inside point.
  2. VertexCreator (Mode: Add Point): Create a line segment connecting the point output from the Matched port (i.e. a given inside point) and the closest point on the polygon boundary (_closest_candidate_x, _closest_candidate_y).
  3. LineExtender (called Extender in FME 2016 and earlier): Extend the line segment so it crosses both left-side boundary and right-side boundary of the polygon.

  4. Clipper: Clip the extended line by the polygon.

  5. LengthCalculator: Compute the length of the clipped line. The result would be the approximate width at the section.

Thanks, got it to work.

 

 

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