geom转换为经纬度
SELECT
st_x ( geom ) AS lon,
st_y ( geom ) AS lat
FROM
表名如果是几何图形会报错
> ERROR: Argument to ST_X() must have type POINT
这时我们可以改为获取几何图形的中心点的经纬度
SELECT
st_x ( ST_PointOnSurface(geom) ) AS lon,
st_y ( ST_PointOnSurface(geom) ) AS lat
FROM
表名;获取几何图形的中心点
SELECT ST_PointOnSurface(geom) FROM 表名 ;
geom转换为POINT
SELECT
ST_asText ( geom )
FROM
表名
SRID查询
SELECT st_srid(geom) FROM 表名;
SRID转换，如4549转4326
SELECT st_astext(
st_transform(
ST_GeomFromText('POINT(521519.84150795196 3070180.2299377914)', 4549 ), 4326) )几何类型坐标系转换
SELECT st_transform(geom,4549) FROM 表名 LIMIT 9;判断两个几何类型是否相交
SELECT ST_Intersects(geom1, geom2);
