Creating centerline of polygon using PostGIS?

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I am aware of Finding centrelines from polygons in QGIS? but I am looking for another Open Source GIS way to do this.

Is there a possibility to create centerlines in PostGIS?

I have this shapefile (see below) which contains different zones. I need a centerline in each zone - it may not be one line, it can be more (for example in brown zone).

In ArcGIS I can separate each zone as a new shapefile and then use ET Geowizard to create that lines.





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