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  1. MariaDB Server
  2. MDEV-642

LP:855323 - ST_AREA returns different results on two equivalent multipolygons

        Details

        • Type: Bug
        • Status: Open
        • Priority: Minor
        • Resolution: Unresolved
        • Affects Version/s: 5.3.9
        • Fix Version/s: 5.3.13, 5.5
        • Component/s: None
        • Labels:

          Description

          The following 2 polygons appear equivalent when graphed with a GUI application:

          MULTIPOLYGON (
  ((4 6, 4 7.14285714285714, 8 6, 4 6), (8 6, 9 9, 9 6, 8 6)), 
  ((4 7.14285714285714, 1 8, 4 8.375, 4 7.14285714285714)), 
  ((4 8.375, 4 9, 9 9, 4 8.375))
)


MULTIPOLYGON (
  ((9 9, 4 8.375, 4 9, 9 9)), 
  ((4 7.14285714285714, 1 8, 4 8.375, 4 7.14285714285714)), 
  ((4 7.14285714285714, 8 6, 4 6, 4 7.14285714285714)), 
  ((8 6, 9 9, 9 6, 8 6))
  )

          And yet ST_AREA() returns different results for them. Same is observed in PostGIS, and it seems incorrect.

            Gliffy Diagrams

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                ratzpo Rasmus Johansson added a comment -

                Launchpad bug id: 855323

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                ratzpo Rasmus Johansson added a comment - Launchpad bug id: 855323

                  People

                  • Assignee:
                    holyfoot Alexey Botchkov
                    Reporter:
                    philipstoev Philip Stoev
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                    Dates

                    • Created:
                      Updated: