SQL 的距离差异 - 为什么差异如此之大？

Question

如果计算坐标之间的距离，我使用了2种方法，它们之间的差异很大（超过400米）。你知道为什么吗？以及所有计算方法中哪一种是最准确的？

第一名：

DECLARE @source geography = 'POINT(53.9202690124512 14.2586479187012)'
DECLARE @target geography = 'POINT(53.8970128 14.2387088)'

SELECT @source.STDistance(@target)

第二名：

SELECT geography::Point(53.9202690124512, 14.2586479187012, 4326).STDistance(geography::Point(53.8970128, 14.2387088, 4326))

Answer 1

geography::Point 期望纬度和经度按该顺序传递。 WKT 的 POINT 期望经度和纬度按该顺序传递。查看结果：

DECLARE @wkt_source geography = 'POINT(53.9202690124512 14.2586479187012)'
DECLARE @wkt_target geography = 'POINT(53.8970128 14.2387088)'

select @wkt_source.STAsText() as wkt_source, @wkt_target.STAsText() as wkt_target

declare @point_source geography = geography::Point(53.9202690124512, 14.2586479187012, 4326)
declare @point_target geography = geography::Point(53.8970128, 14.2387088, 4326)


select @point_source.STAsText() as point_source, @point_target.STAsText() as point_target

因此您需要交换一个或另一个来获得一致的结果（取决于哪个 lat/lng 是正确的）。

SQL 的距离差异 - 为什么差异如此之大？

Distance difference in SQL - why so big discrepancy?

sql

sql-server

spatial-query

sqlgeography