[postgis-tickets] [PostGIS] #2433: ST_ConcaveHull 2.1 regres failure compared to 2.0.3

[PostGIS]

#2433: ST_ConcaveHull 2.1 regres failure compared to 2.0.3
---------------------+------------------------------------------------------
 Reporter:  robe     |       Owner:  pramsey      
     Type:  defect   |      Status:  new          
 Priority:  high     |   Milestone:  PostGIS 2.1.0
Component:  postgis  |     Version:  2.0.x        
 Keywords:           |  
---------------------+------------------------------------------------------

Comment(by nicklas):

 In trunk version something happens when there is more than 3 points.



 {{{
 SELECT st_astext(ST_ConcaveHull(
 'SRID=1;MULTIPOINT(1 1, 2 2, 2 1)'::geometry,
  0.5,false));
 }}}
 gives the same answer in both 2.0 and trunk:

 {{{
 POLYGON((1.004 1.004,1.996 1.004,1.996 1.996,2 2,2 1,1 1,1.004 1.004))
 }}}

 but

 {{{
 SELECT st_astext(ST_ConcaveHull(
 'SRID=1;MULTIPOINT(1 1, 2 2, 2 1, 2 0)'::geometry,
  0.5,false))
 }}}
 gives the "mixed SRID" error in trunk. In 2.0 it returns:

 {{{
 POLYGON((2 0,1 1,2 2,2 0))
 }}}

 which doesn't seem to "shrink" the polygon like the 3-point answer does.

-- 
Ticket URL: <http://trac.osgeo.org/postgis/ticket/2433#comment:1>
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