Recently I tried this model from Anita, and it worked very well. Avoid using too high accuracy values while exploring it, cause the calculation can take long.

http://gis.stackexchange.com/questions/33887/finding-centrelines-from-polygons-in-qgis

Raymond


On 16-03-17 20:16, Stefan Ziegler wrote:
Hi Boaz

I just stumpled across some very nice PostGIS functions few days ago:

http://postgis.net/docs/manual-2.2/ST_ApproximateMedialAxis.html
http://postgis.net/docs/manual-2.2/ST_StraightSkeleton.html

For ST_ApproximateMedialAxis() you need SFCGAL extension installed.

regards
Stefan

On Thu, Mar 16, 2017 at 8:06 PM, Boaz Bar Ilan <boazpro...@gmail.com
<mailto:boazpro...@gmail.com>> wrote:

    I need to draw a center line across a polygon.  Is there a way to do
    it ?
    Thanks
    Boaz

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