I was wondering about the method/specification of choosing the first vertex in a polygon. Let's say that I have polygon that has 4 vertices,
([0 0] [10 0] [10 10] [0 10]). Which of them will be the first node when iterating through them (and why)?
My thought is that the vertex with minimal x-value is chosen (and if there are several vertices that share the same x-coord then the vertex with minimal y-value among them is chosen),also the nodes above would be represented this way in a GeoJSON:
[[[0 0] [10 0] [10 10] [0 10] [0 0]]]
I have not found any source that confirms or denies this.
I am using OSM data that is stored in PostGIS and the polygons will be examined by simple software that I wrote.