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我正在使用geography.STDistance()来返回两个单点位置之间的距离.我很好奇哪个测量用于返回值？是KM,里程还是其他？

我得到的结果高达250k,但我不知道我的TSQL是否做错了,因为这些是历史位置(即它们不再存在)所以我不能只是快速查找.

declare @p1 geography

declare @p2 geography

SELECT @p1 = Location from tblLocations where Id = 1
SELECT @p2 = Location from tblLocations where Id = 2

select @p1.STDistance(@p2)

这是我的代码.

Create Table [dbo].[MajorCities]
(
[CityID] int Identity(1,1),
[CityName] varchar(60),
[Latitude] float,
[Longitude] float,
GeoRef Geography
)

INSERT INTO dbo.[MajorCities] values
 ('New Delhi, India', 28.6, 77.2, null),
 ('Paris, France', 48.86667, 2.3333, null),
 ('Rio de Janeiro, Brazil', -22.9, -43.23333, null),
 ('Sydney, Australia', -33.88306, 151.21667, null),
('New York City, USA', 40.78333, -73.96667, null)

select * from [MajorCities]


UPDATE [dbo].[MajorCities]
SET [GeoRef] = geography::STPointFromText ('POINT (' + CAST ([Longitude] AS VARCHAR (20)) + ' ' +
                    CAST ([Latitude] AS VARCHAR (20)) + ')', …