使用SQL地理学获取特定点半径内的位置 [英] Get places in radius of a certain point using SQL geography

问题描述

我有一个具有地理类型的SQL表列:

I have an SQL table column with the Geography type:

create table dbo.Events
(
  Id int identity not null 
    constraint PK_Events_Id primary key clustered (Id),
  Localization geography not null
);

如何获取半径40公里范围内的所有事件?这可能吗?

How can I get all events in a radius of 40 km? Is this possible?

谢谢， 米格尔(Miguel)

Thank You, Miguel

推荐答案

假定您具有要搜索的点的经度和纬度:

Assuming you have latitude and longitude of the point from which you want to search:

DECLARE @Origin GEOGRAPHY,
        -- distance defined in meters
        @Distance INTEGER = 40000;        

-- center point
SET @Origin = GEOGRAPHY::STGeomFromText('POINT(-122.084039 37.42227)', 4326);

-- return all rows from events in 40km radius
SELECT * FROM dbo.Events WHERE @Origin.STDistance(Localizaton) <= @Distance;

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