public static SqlGeography CreatePolygon(Coordinates[] coordinates, int srid)
{
var list = coordinates.Distinct().ToList();
var b = new SqlGeographyBuilder();
b.SetSrid(srid);
b.BeginGeography(OpenGisGeographyType.Polygon);
b.BeginFigure(list[0].Latitude, list[0].Longitude);
for (var i = 1; i < list.Count; i++)
b.AddLine(list[i].Latitude, list[i].Longitude);
b.AddLine(list[0].Latitude, list[0].Longitude);
b.EndFigure();
b.EndGeography();
//Fix left-hand rule. We always want left-hand.
var g = b.ConstructedGeography;
if (!g.STIsValid())
throw new SisoDbException(ExceptionMessages.NotAValidPolygon.Inject(g.IsValidDetailed()));
if (g.EnvelopeAngle() > 90)
g = g.ReorientObject();
return g;
}
