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normalize

Organizes the elements, rings, and coordinate order of geometries in a consistent way, so that geometries that represent the same object can be easily compared.

Modifies the geometry in-place.

Normalization ensures the following:

  • Lines are oriented to have smallest coordinate first (apart from duplicate endpoints)
  • Rings start with their smallest coordinate (using XY ordering)
  • Polygon shell rings are oriented CW, and holes CCW
  • Collection elements are sorted by their first coordinate

Note the Polygon winding order, OGC standard uses the opposite convention and so does GeoJSON. Polygon ring orientation could be changed via orientPolygons.

Returns​

this

The same geometry but normalized, modified in-place