[postgis-devel] [PostGIS] #399: ST_CleanGeometry

[PostGIS]

#399: ST_CleanGeometry
----------------------+-----------------------------------------------------
  Reporter:  strk     |       Owner:  strk         
      Type:  task     |      Status:  assigned     
  Priority:  medium   |   Milestone:  PostGIS 2.0.0
 Component:  postgis  |     Version:               
Resolution:           |    Keywords:               
----------------------+-----------------------------------------------------
Comment (by strk):

 Alright. Something to see is in r5240.

 It is an ST_MakeValid() function, taking an optional boolean parameter
 saying if dimensionally collapsed parts should also be collected in
 output. You can take
 a look at the new regression test for example of cases handled by this
 one.

 Collapsed parts are basically only portion of rings which go up and down
 the
 same path and do not fall inside the containing shell. They are also
 referred
 to as "cut edges" from polygonize operation. The function currently
 doesn't collect
 dimensional collapsed rings which are internal to the shell as that part
 is considered
 already included in the topological point set found in output.

 In the same revision there's a stub for an ST_CleanGeometry() basically
 wrapping
 ST_MakeValid and performing additional cleanups (forceRHR,
 removeRepeatedPoint)
 and checks on output (same type, no discarded points). This is just a
 stub, not
 completed yet (and no regress test consequently).

 Early tests and comments welcome.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/399#comment:22>
PostGIS <http://trac.osgeo.org/postgis/>
The PostGIS Trac is used for bug, enhancement & task tracking, a user and developer wiki, and a view into the subversion code repository of PostGIS project.