GeogFromText和Point之间的PostGIS ST_Distance差异

Question

SELECT t.coords, t2.coords,
  ST_Distance(ST_GeogFromText('SRID=4326;POINT(-115.83225 44.18711)'), ST_GeogFromText('SRID=4326;POINT(-105.83225 54.18711)')) AS d1,
  ST_Distance(ST_Point(t.coords[2], t.coords[1]), ST_Point(t2.coords[2], t2.coords[1])) AS d2
FROM locations
INNER JOIN locations t2 ON t2.id = 1
WHERE t.id = 2;

t.coords = "{44.18711,-115.83225}"和t2.coords = "{54.18711,-105.83225}"

d1以1326899.86792105和d2作为14.142135623731返回。

为什么？谢谢！

Answer 1

似乎我必须将ST_Point转换为geography类型，然后才有效。