[postgis-devel] [PostGIS] #1647: CreateTopology vs toTopoGeom: different behavior on the use of tolerance

[PostGIS]

#1647: CreateTopology vs toTopoGeom: different behavior on the use of tolerance
----------------------+-----------------------------------------------------
 Reporter:  lrssvt    |       Owner:  strk         
     Type:  defect    |      Status:  new          
 Priority:  medium    |   Milestone:  PostGIS 2.0.0
Component:  topology  |     Version:  2.0.x        
 Keywords:            |  
----------------------+-----------------------------------------------------
 I have noticed a different behavior using the tolerance.
 If I set tolerance value to 1, in CreateTopology function get:

 [[Image(toleranceCreateTopology.png)]]

 while, if I set the same tolerance to toTopoGeom function get:

 [[Image(tolerancetoTopoGeom.png)]]

 Also, if I set tolerance value to 2 in CreateTopology I get this error:


 {{{
 ERROR: Invalid edge (no two distinct vertices exist)
 SQL state: P0001
 Context: PL/pgSQL function "topogeo_addlinestring" line 147 at assignment
 SQL statement "INSERT INTO test_topo.relation(topogeo_id, layer_id,
 element_type, element_id) SELECT 1, 1, 2,
 topogeo_addLineString('test_topo',
 '01020000201555000003000000329ABD50D7F92041C6FE24DDB5AF014159102D22D7F92041DDB54250BBAF0141FC05F508D7F9204144A619EEC2AF0141'::geometry,
 2);"
 PL/pgSQL function "totopogeom" line 120 at EXECUTE statement
 }}}

 I did this test with the SQL script attached!

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/1647>
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.