[postgis-devel] RFC - Orientation checking and forcing functions

[Sandro Santilli]

On Tue, Feb 07, 2017 at 07:55:27PM -0500, Daniel Baston wrote:

> Non-polygonal geometries, including closed LineStrings, are
> simply passed through.

This is the part I don't like. A closed LineString is really the
only geometry that can be strictly clockwise or clounterclockwise
(while polygons want shells and hole in opposite directions) so
I find it counter-intuitive for ST_IsCW and ST_IsCCW to both return
true for them, and for ST_ForceCW and ST_ForceCCW to return them
untouched.

--strk;