[postgis-tickets] [PostGIS] #4034: Additional splitting self-intersected lines

PostGIS trac at osgeo.org
Mon Mar 5 03:18:59 PST 2018


#4034: Additional splitting self-intersected lines
---------------------------+---------------------------
 Reporter:  Andrzej Kępys  |      Owner:  pramsey
     Type:  defect         |     Status:  new
 Priority:  medium         |  Milestone:  PostGIS 2.4.4
Component:  postgis        |    Version:  2.4.x
 Keywords:                 |
---------------------------+---------------------------
 I'm not sure if it's a bug, but when I try to st_difference self
 intersected line I'm getting line additionally divided also in a point of
 self-intersection.

 Example:

 select ST_AsText(ST_difference(aa.geom,
 ST_Buffer(ST_MakePoint(-79.3226028055573, 43.7717938393679),0.00001)))
 from (select ST_GeomFromText('LINESTRING(-79.32193761772157
 43.77267702526523,-79.32157820171358 43.7718287022164,-79.3214011759186
 43.77199526887857,-79.32260280555727 43.771793839367916,-79.32308023876192
 43.771685377042715,-79.32367568916322 43.77158853551472)') as geom) as aa

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4034>
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