[postgis-tickets] [PostGIS] #4289: A multipolygon is inverted in ST_AsMVTGeom in some cases

PostGIS trac at osgeo.org
Thu Jan 10 01:02:03 PST 2019


#4289: A multipolygon is inverted in ST_AsMVTGeom in some cases
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  Reporter:  ajolma   |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:
 Component:  postgis  |    Version:  trunk
Resolution:           |   Keywords:  vector tile
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Comment (by Algunenano):

 Another side note: the current output also shows another bug I saw
 recently (and addressed in that PR), which is the polygon having float
 values (`31 81,229 79,224.333333333333 76.6666666666667,229 80,231.5
 82.5)`).

 This has an even harder solution since the quick way, which is snapping to
 grid after validation, means that the polygon could be invalid again so
 you'd have to redo the `make_valid` call -> grid -> valid -> grid... This
 doesn't happen with wagyu (which only works with ints), but the default
 GEOS based solution would require a major effort to solve this.

-- 
Ticket URL: <https://trac.osgeo.org/postgis/ticket/4289#comment:6>
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