DECLARE @BJ GEOGRAPHY
DECLARE @XT GEOGRAPHY
/*
GET Latitude/Longitude FROM here:http://www.travelmath.com/cities/Beijing,+China
the distance unit in SRID 4326 is the meter
*/
SELECT @BJ = geography::Point(‘39.92889‘, ‘116.38833‘, 4326)
SELECT @XT = geography::Point(‘37.0630556‘, ‘114.4941667‘, 4326)
SELECT
@BJ AS Beijing,
@XT AS Xingtai,
‘The distance is ‘ +
CAST(@BJ.STDistance(@XT)/1000 AS VARCHAR(MAX)) + ‘ km‘ AS Distance
[MSSQL2008]Spatial Data in SQL Server 2008 - 根据经纬度计算两点间距离
原文：http://www.cnblogs.com/kkun/p/Spatial-Data-Geography.html