id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
472	Missing ST_IsValid for Geography Types	rfcmedia	pramsey	"There is no ST_IsValid for geography types.

I do not think casting a geography as a geometry and then running it through ST_IsValid will yield correct results either.

Consider a polygon (-170 0, 170 0, 178 5, 178 -5, -170 0) in degrees on a spherical surface.  This is not a valid polygon as there is clearly an intersection between two lines at (178, 0) but this would be considered a valid polygon if it were cast as a geometry."	enhancement	new	medium	PostGIS Future	postgis	trunk