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Linear Referencing Speed along line / Event CSV and Line Geometry

  • March 11, 2025
  • 2 replies
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galigis
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Hi All,

I have been trying to put a workflow together to linear referencing a few event tables in GIS. I usually do the task in ArcGIS but this time I want to automate the process as much I can.

I have been checking a few of the LRS FME tutorials online but can’t get it to work. The aim is to linear referencing speeds along a railway route (line) using an event table that relates the lines and speeds.

The input of my workflow as follows:

  • Event table (xls) that shows the Line and speeds, example below:

 

  • Line geometry with the line ID as well the ‘From_Chain’ and ‘To_Chain’ fields as parts of the attribute

 

I have got to this point in the automation but can’t get the Snipper to work for some reason since doesn’t split the lines according to the speed lengths: 

 

Any advise how to accomplish the task?

Thanks

 

Best answer by galigis

Thanks ​@birgit I think I have made a few changes and the workflow seems to do what I want now. Below a breakdown of the transformers used to do the trick:

  • MeasureGenerator for the Line
  • FeatureMerger to join table and line by Line_ID. Generate List ticked on with all the attributes selected.
  • List Exploder
  • Snipper
  • LineonLineOverlayer to remove the duplicates / overlaps

Also below an screenshot of the workflow:

I hope this helps! :)

 

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2 replies

birgit
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  • birgitInfluencer
  • Influencer
  • March 11, 2025

Does your geometry actually have measures on them?

Feature attributes as seen in the Inspector

Also check this page: 

 

🫠
galigis
galigis
Enthusiast
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  • galigisEnthusiast
  • Author
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  • Best Answer
  • March 12, 2025

Thanks ​@birgit I think I have made a few changes and the workflow seems to do what I want now. Below a breakdown of the transformers used to do the trick:

  • MeasureGenerator for the Line
  • FeatureMerger to join table and line by Line_ID. Generate List ticked on with all the attributes selected.
  • List Exploder
  • Snipper
  • LineonLineOverlayer to remove the duplicates / overlaps

Also below an screenshot of the workflow:

I hope this helps! :)

 

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