mysql根据经纬度求两地距离

#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.