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Approximate CenterLine of Polygon

  • May 27, 2019
  • 2 replies
  • 465 views
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I am working on FME 2019.0.1 I am trying to find out a center line(Approx. Center Line in FME 2019) of the polygon in the below geometry. The polygon is the input and polyline is the output.

I tried using Generalizer with Douglas(Generalize)with varied Tolerance (after using converting it to LL-84) and McMaster (Smooth) and above is the best output. In the ideal scenario, the output should look something like below:

 

Basically, the polylines touching the center end parts of the polygon.

My approach: Create a bounding box. Put weights at the points touching the polygons. Join the polyline output at weights. Will that be a possibility? I have still not worked on it. Just an idea.

Any other ideas I can work upon! Thanks.

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2 replies

david_r
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  • david_rCelebrity
  • 8394 replies
  • May 27, 2019

Did you try the CenterLineReplacer and each of the three different modes?

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  • dewan
  • Author
  • 39 replies
  • May 31, 2019

Did you try the CenterLineReplacer and each of the three different modes?

Thanks @david_r for your response. I have tried all 3 of them and Approx Center Line fixes the issue in the most perfect way.

I have shared the base map of the road. This might provide a very clear picture and what is to be required. The end nodes on point 1 and 2 are going away from the central part of the polygon shape. Point 3 is understandable since the polygon was captured from satellite imagery, but, somehow I feel 1 and 2 can come towards the center.

I tried using Generalizer using multiple algorithms but not very much helpful. I think it might be possible with a series of transformers that I cannot reach.

Your views on that!

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