[postgis-tickets] [PostGIS] #4906: ST_LocateAlong wrongly returns multipoint

PostGIS trac at osgeo.org
Mon May 3 23:37:39 PDT 2021


#4906: ST_LocateAlong wrongly returns multipoint
-----------------------+----------------------------
 Reporter:  schelm903  |      Owner:  pramsey
     Type:  defect     |     Status:  new
 Priority:  medium     |  Milestone:  PostGIS 2.4.10
Component:  postgis    |    Version:  2.4.x
 Keywords:             |
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 I have created a View which shows the derived Point geometries of an
 event-table with the row "position" (m-values) on a LinestringZM. The
 geometries are produced with ST_Locate_Along.
 Whenever an entry on the event table has the exact m-value of a vertex of
 the linestring and a defined offset, two points are generated.

 I am not sure if this is on purpose or a bug as the support of multipoints
 was added in the past:

 Ticket [https://trac.osgeo.org/postgis/changeset/8758]

 For our purposes though this behavior is a problem. In my view  only one
 point lying between the two should be generated.

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/4906>
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