如何存储经度&纬度作为 sql server 2014 中的地理? [英] How to store longitude & latitude as a geography in sql server 2014?

问题描述

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 2km 的所有行.

I have locations in longitude and latitude coordinates. My goal is eventually to be able to select all rows from myTable Where distance is less than 2km.

1. 如何使用经度和纬度来存储地理列中的位置?(因为它应该只有一个地理点而不是两个，对吗?一个不是经度，一个是纬度?)

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

既然我已经有了地理点，我该如何选择特定距离(在我的情况下为 2 公里)内的所有行?

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

推荐答案

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?一个不是经度，一个是纬度?)

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 到将经度和纬度存储在地理数据类型中.

You can use geography::STPointFromText / geography::Point to store longitude and latitude in a geography datatype.

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

或

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

参考链接:

更新表中的地理列

既然我已经有了地理点，我该如何选择特定距离(在我的情况下为 2 公里)内的所有行?

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 之类的这个.

You can use STDistance like this.

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);

参考链接:

在 sqlserver 中使用 Geography 数据类型的两点之间的距离2008 年?

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;

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