[postgis-users] reverseWindingOrder and isClockwise in PostGIS

Picavet Vincent Vincent.Picavet at mediapost.fr
Wed Sep 30 10:45:54 PDT 2009


> today i am searching for a postgis based solution which gives 
> me an answer on the question
> isClockwise(POLYGON)
> and if this is true
> reverseWindingOrder(POLYGON)

PostGIS provides the following function :

    Force polygons of the collection to obey Right-Hand-Rule.

Does that suit your needs or you really want to test if your polygon is
clockwise ?


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