In a POLYGON geometry, how can you tell if a ring is an outer ring or inner ring?
- Is it by the clockwise vs counter clockwise order of vertices? I've seen data where this was not respected and it created problems.
- is it that the first ring is always outer ring and the second is an innner ring?
- would you consider adding a a header byte or value to indicate this explocitely?
- can you provide an example of a POLYGON or MULTIPOLYGON representing an island that has multiple lakes with an island with a lake in it?
In a POLYGON geometry, how can you tell if a ring is an outer ring or inner ring?