Answers:
除了ST_AsText(它将几何图形返回为WKT /知名文本)之外,还有其他几种输出格式,例如ST_AsGeoJSON()。
在http://postgis.net/docs/manual-2.0/reference.html#Geometry_Outputs中进行查看,然后选择最适合您的需求。
使用ST_AsText查看点对象:
SELECT ST_AsText(the_geom)
FROM myTable;
SELECT ST_X(the_geom), ST_Y(the_geom), ST_AsText(the_geom)
FROM myTable;
st_x(st_centroid(the_geom))
带有UTM中的表格
SELECT
ST_X(table.geometry) AS X1, --point x
ST_Y(table.geometry) AS Y1, --point y
ST_X(ST_TRANSFORM(table.geometry,4674)) AS LONG, -- longitude point x SIRGAS 2000
ST_Y(ST_TRANSFORM(table.geometry,4674)) AS LAT, --latitude point y SIRGAS 2000
ST_ASTEXT(table.geometry) AS XY, --wkt point xy
ST_ASTEXT(ST_TRANSFORM(table.geometry,4674)) AS LongLat --using st_transform to get wkt with longitude and latitude (4674 is the SIRGAS 2000 SRC by south america)
FROM
table
SELECT * ST_AsText(the_geom) FROM table2;
资料来源: 使用PostGIS从多个表中获取几何?