从某个点到最近的地方 [英] Nearest places from a certain point

问题描述

我有下表

create table places(lat_lng point, place_name varchar(50));

insert into places values (POINT(-126.4, 45.32), 'Food Bar');

要使所有位置都接近特定经度/纬度的查询应该是什么?

What should be the query to get all places close to particular lat/long?

gis已安装.

推荐答案

如果您确实想使用PostGIS:

If you actually wanted to use PostGIS:

create table places(
    lat_lng geography(Point,4326),
    place_name varchar(50)
);

-- Two ways to make a geography point
insert into places values (ST_MakePoint(-126.4, 45.32), 'Food Bar1');
insert into places values ('POINT(-126.4 45.32)', 'Food Bar2');

-- Spatial index
create index places_lat_lng_idx on places using gist(lat_lng);

现在可以找到1公里(或1000 m)以内的所有地点:

Now to find all of the places within 1 km (or 1000 m):

select *, ST_Distance(lat_lng, ST_MakePoint(-126.4, 45.32)::geography)
from places
where ST_DWithin(lat_lng, ST_MakePoint(-126.4, 45.32)::geography, 1000)
order by ST_Distance(lat_lng, ST_MakePoint(-126.4, 45.32)::geography);

这篇关于从某个点到最近的地方的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！