How to get the center line between two linestrings

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Where is the track of a ship when it is shipping always in the center of the English Channel between the coasts of Great Britain and France?

  1. I started with 2 linestrings and I created a lot of points on the linestring with a postgis query.
  2. After that I created a distance matrix with Raster/Analysis/Proximity in QGIS.
  3. Finally I created an aspect raster from the output raster.


Is the red line really the "center line" between these two linestrings?

Is there a more efficient way to do this?



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