Hi All, I want to filter my datasets for features which are closed polygons with surface area>0. I assume I need a filter but which one and how to set it right?
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How can I filter for closed polygons with surface area >0?
Best answer by redgeographics
You can use a GeometryFilter to filter out polygons, they should already have an area > 0 but if you want to be extra sure you can then use an AreaCalculator to calculate the area and a TestFilter or Tester to filter on that (or the @Area() function within a Tester/Testfilter)
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You can use a GeometryFilter to filter out polygons, they should already have an area > 0 but if you want to be extra sure you can then use an AreaCalculator to calculate the area and a TestFilter or Tester to filter on that (or the @Area() function within a Tester/Testfilter)
thank you but how can I be secure that the polygons are closed is this ensured if I choose "Area" in the parameters?
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timhongjong wrote:
thank you but how can I be secure that the polygons are closed is this ensured if I choose "Area" in the parameters?
A polygon is essenially a line that has at minimun 4 vertices with the first and last vertices having the same coordinates. If the polygon is not 'closed' then it is a line
hkingsbury wrote:
A polygon is essenially a line that has at minimun 4 vertices with the first and last vertices having the same coordinates. If the polygon is not 'closed' then it is a line
Makes Sense, Thank you
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