mysql根据经纬度求两地距离

Posted 2021-01-21 追极

#1.两点距离(1.4142135623730951)
select st_distance(point(0,0),point(1,1));
select st_distance(point (120.10591, 30.30163),point(120.13026,30.25961));
mysql 5.6 添加

#2.两点球面距离（157249.0357231545m）
select st_distance_sphere(point(0,0),point(1,1));
select st_distance_sphere(point (120.10591, 30.30163),point(120.13026,30.25961));
This function was added in MySQL 5.7.6.

 

第一个函数是计算平面坐标系下，两点的距离，就是

• 

 如果用于计算地球两点的距离，带入的参数是角度（0-360度），则计算的单位也是相差的角度，用此角度计算距离不准。纬度距离约111km每度，经度距离在赤道平面上是111km每度，随纬度的升高逐渐降低为0。

 

第二个函数是计算球面距离的公式，传入的参数是经纬度（经度-180～180，纬度-90～90），返回的值以m为单位的距离。

ST_Distance_Sphere(g1, g2 [, radius])

Returns the mimimum spherical distance between two points and/or multipoints on a sphere, in meters, or NULL if any geometry argument is NULL or empty.

Calculations use a spherical earth and a configurable radius. The optional radius argument should be given in meters. If omitted, the default radius is 6,370,986 meters. An ER_WRONG_ARGUMENTS error occurs if the radius argument is present but not positive.

The geometry arguments should consist of points that specify (longitude, latitude) coordinate values:

• Longitude and latitude are the first and second coordinates of the point, respectively.

• Both coordinates are in degrees.

• Longitude values must be in the range (-180, 180]. Positive values are east of the prime meridian.

• Latitude values must be in the range [-90, 90]. Positive values are north of the equator.

Supported argument combinations are (Point, Point), (Point, MultiPoint), and (MultiPoint, Point). An ER_GIS_UNSUPPORTED_ARGUMENT error occurs for other combinations.

If any geometry argument is not a syntactically well-formed geometry byte string, an ER_GIS_INVALID_DATA error occurs.

mysql> SET @pt1 = ST_GeomFromText(‘POINT(0 0)‘);
mysql> SET @pt2 = ST_GeomFromText(‘POINT(180 0)‘);
mysql> SELECT ST_Distance_Sphere(@pt1, @pt2);
+--------------------------------+
| ST_Distance_Sphere(@pt1, @pt2) |
+--------------------------------+
|             20015042.813723423 |
+--------------------------------+

This function was added in MySQL 5.7.6.