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Informations about the package get-mbr

GetMbr

根据经纬度,获取'MBR'数据

说明:

这个根据一个经纬度坐标、距离然后求另外一个经纬度坐标的作用, 主要就是确定一个最小外包矩形(Minimum bounding rectangle,简称MBR)。

这个矩形是包含5公里范围内所有这些有效信息的一个最小矩形。 利用公式,求出四个方向0度、90度、180度、270度方向上的四个坐标点就可以得到这个MBR。

例如,我要找一个坐标点(lat,lon)的5公里范围内的所有商户信息、景点信息等。 这个MBR就是一个经纬度范围值,包含了最大经度,最小经度,最大纬度,最小纬度。

如果表里存有100万条数据,数据包含一个lat、lon的经纬度信息。 就可以先根据输入的经纬度和距离得到一个MBR,然后通过类似已下的SQL进行距离筛选了

安装

使用示例

示例程序输出:


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