Ticket #1498 (new enhancement)

Opened 16 months ago

Last modified 7 weeks ago

ST_CrossProduct ?

Reported by: strk Owned by: pramsey
Priority: low Milestone: PostGIS Future
Component: postgis Version: trunk
Keywords: Cc: strk

Description

Not sure I really want this, but seems a good thing to have for computing winding of topological rings w/out constructing the full polygon, applying ForceRHR and comparing with ST_OrderingEquals.

Change History

Changed 16 months ago by strk

  • priority changed from medium to low

Could also be ST_SignedArea or ST_SignedSquaredArea.

.. or could be that topology should get down one level

Changed 16 months ago by strk

Note that I found a limit in the "construct full polygon, and apply ForceRHR" idea in that LineMerge? won't let you construct self-touching rings, thus make it impossible at the moment to construct the polygon. See ticket #1500 for a solution to that problem.

Changed 7 weeks ago by robe

  • cc strk added

what is this?

Changed 7 weeks ago by strk

It's to compute a ring's winding by only looking at edges that compose it. Probably only useful for topology.

Changed 7 weeks ago by robe

well are you going to do something about it in 2.1.0? If not push and then push back if you happen to get to it.

Changed 7 weeks ago by strk

  • milestone changed from PostGIS 2.1.0 to PostGIS Future

Future..

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