ST_Intersection returns wrong values with high latitudes

[mhiper3]

When using latitudes far from the equator the ST_Intersects() function returns unexpected values. These are some sample queries that show the inconsistent behavior:

testdb=# select st_intersects(st_geographyfromtext('SRID=4326;POINT(-80 65)'), st_geographyfromtext('SRID=4326;POLYGON((-100 67, -30 67, -30 62, -100 62, -100 67))'));

st_intersects

---

f

(1 row)

testdb=# select st_intersects(st_geographyfromtext('SRID=4326;POINT(-80 65)'), st_geographyfromtext('SRID=4326;POLYGON((-100 67, -40 67, -40 62, -100 62, -100 67))'));

st_intersects

---

t

(1 row)

testdb=# select st_intersects(st_geographyfromtext('SRID=4326;POINT(-80 15)'), st_geographyfromtext('SRID=4326;POLYGON((-100 17, -30 17, -30 12, -100 12, -100 17))'));

st_intersects

---

t

(1 row)

[pramsey]

Please review in light of this.

​http://blog.opengeo.org/2012/04/30/the-earth-is-not-flat-volume-2/