mysql距离计算,单位m,以及排序
lon 经度 lat 纬度
一般地图上显示的坐标顺序为,纬度在前(范围-90~90),经度在后(范围-180~180)
首先新建一张表,里面包含经纬度
SET FOREIGN_KEY_CHECKS=0; -- ---------------------------- -- Table structure for customer -- ---------------------------- DROP TABLE IF EXISTS `customer`; CREATE TABLE `customer` ( `id` int(11) unsigned NOT NULL auto_increment COMMENT '自增主键', `name` varchar(50) NOT NULL COMMENT '名称', `lon` double(9,6) NOT NULL COMMENT '经度', `lat` double(8,6) NOT NULL COMMENT '纬度', PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=8 DEFAULT CHARSET=utf8 COMMENT='商户表'; -- ---------------------------- -- Records of customer -- ---------------------------- INSERT INTO `customer` VALUES ('1', '天津市区', '117.315575', '39.133462'); INSERT INTO `customer` VALUES ('2', '北京市区', '116.407999', '39.894073'); INSERT INTO `customer` VALUES ('3', '保定', '115.557124', '38.853490'); INSERT INTO `customer` VALUES ('4', '石家庄', '114.646458', '38.072369'); INSERT INTO `customer` VALUES ('5', '昌平区1', '116.367180', '40.009561'); INSERT INTO `customer` VALUES ('6', '海淀区2', '116.313425', '39.973078'); INSERT INTO `customer` VALUES ('7', '海淀区1', '116.329236', '39.987231');
然后我们开始用mysql自带的函数,计算customer表中,每个地方具体。
传入参数 纬度 40.0497810000 经度 116.3424590000
/*传入的参数为 纬度 纬度 经度 ASC升序由近至远 DESC 降序 由远到近 */ SELECT *, ROUND( 6378.138 * 2 * ASIN( SQRT( POW( SIN( ( 40.0497810000 * PI() / 180 - lat * PI() / 180 ) / 2 ), 2 ) + COS(40.0497810000 * PI() / 180) * COS(lat * PI() / 180) * POW( SIN( ( 116.3424590000 * PI() / 180 - lon * PI() / 180 ) / 2 ), 2 ) ) ) * 1000 ) AS juli FROM customer ORDER BY juli ASC
至此,我们就能清楚的查看到纬度 40.0497810000 经度 116.3424590000 距离customer表中的每个地区的距离(单位 m)
PS 用到的经纬度查询工具 http://www.gpsspg.com/maps.htm
原文链接:http://www.cnblogs.com/jiafuwei/p/5699091.html