sql - 如何在 sql server 2014 中将经度和纬度存储为地理？

Question

我在经度和纬度坐标中有位置。我的目标是最终能够从 myTable 中选择距离小于 2 公里的所有行。

如何使用经度和纬度在地理列中存储位置？(因为它应该只有一个地理点而不是两个对吗？不是一个经度和一个纬度？)

现在我已经有了地理点，我如何选择特定距离内的所有行(在我的例子中是 2 公里)？

Answer 1

How can i use the longitute and latitute to store location within a geography column?(because it's supposed to be only one geographic point not two right? not one for longitute and one for latitute?)

您可以使用 geography::STPointFromText / geography::Point 将经度和纬度存储在地理数据类型中。

SELECT geography::STPointFromText('POINT(' + CAST([Longitude] AS VARCHAR(20)) + ' ' + CAST([Latitude] AS VARCHAR(20)) + ')', 4326)

或者

SELECT geography::Point(Latitude, Longitude , 4326)

引用链接:

Update Geography column in table

Now that I've got the geography points, how can i select all the rows within a specific distance(in my case 2km)?

您可以使用 STDistance 像这样。

DECLARE @g geography;
DECLARE @h geography;
SET @g = geography::STGeomFromText('POINT(-122.35900 47.65129)', 4326);
SET @h = geography::STGeomFromText('POINT(-122.34720 47.65100)', 4326);
SELECT @g.STDistance(@h);

引用链接:

Distance between two points using Geography datatype in sqlserver 2008?

插入查询

DECLARE @GeoTable TABLE 
(
    id int identity(1,1),
    location geography
)
--Using geography::STGeomFromText
INSERT INTO @GeoTable 
SELECT geography::STGeomFromText('POINT(-122.35900 47.65129)', 4326)

--Using geography::Point
INSERT INTO @GeoTable 
SELECT geography::Point(47.65100,-122.34720, 4326);

获取距离查询

DECLARE @DistanceFromPoint geography
SET @DistanceFromPoint =  geography::STGeomFromText('POINT(-122.34150 47.65234)', 4326);

SELECT id,location.Lat Lat,location.Long Long,location.STDistance(@DistanceFromPoint) Distance
FROM @GeoTable;