[英]convert Postgres geometry format to WKT
I have a Postgres table which stores polygon geometry in its specific format in one of the column, something like this-我有一个 Postgres 表,它在其中一列中以特定格式存储多边形几何,就像这样 -
0103000020E61000000100000004000000B8627F336B1554405DD602FFA2733A40B8627FA7601554403851F8EBC7723A40B8627FC38F15544036D539E90B733A40B8627F336B1554405DD602FFA2733A40
I know how to convert this single value to WKT using ST_AsText
which will give me POLYGON((Lat Long)).我知道如何使用
ST_AsText
将这个单一值转换为 WKT,这会给我 POLYGON((Lat Long))。 But I want to convert whole column into WKT format.但我想将整列转换为 WKT 格式。
How to achieve this?如何实现这一目标?
Thanks!谢谢!
Have you tried this?你试过这个吗?
SELECT ST_AsText(your_geom_column) FROM your_table
In the following examples I'll show you a few ways to serialise your geometries - data sample with two points encoded as 4326 (WGS84):在以下示例中,我将向您展示几种序列化几何的方法 - 两个点的数据样本编码为 4326 (WGS84):
CREATE TEMPORARY TABLE tmp (geom GEOMETRY);
INSERT INTO tmp VALUES ('SRID=4326;POINT (1 2)'),
('SRID=4326;POINT (2 4)');
Geometries as WKB
(default):几何图形作为
WKB
(默认):
SELECT geom FROM tmp;
geom
----------------------------------------------------
0101000020E6100000000000000000F03F0000000000000040
0101000020E610000000000000000000400000000000001040
Geometries as WKT
and EWKT
(EWKT = WKT with an explicit Spatial Reference System):作为
WKT
和EWKT
几何(EWKT = WKT 具有显式空间参考系统):
SELECT ST_AsText(geom),ST_AsEWKT(geom) FROM tmp;
st_astext | st_asewkt
------------+----------------------
POINT(1 2) | SRID=4326;POINT(1 2)
POINT(2 4) | SRID=4326;POINT(2 4)
In case you fancy GeoJSON
..如果您喜欢
GeoJSON
..
SELECT ST_AsGeoJSON(geom) FROM tmp;
st_asgeojson
--------------------------------------
{"type":"Point","coordinates":[1,2]}
{"type":"Point","coordinates":[2,4]}
SELECT ST_AsGML(geom) FROM tmp;
st_asgml
-----------------------------------------------------------------------------------
<gml:Point srsName="EPSG:4326"><gml:coordinates>1,2</gml:coordinates></gml:Point>
<gml:Point srsName="EPSG:4326"><gml:coordinates>2,4</gml:coordinates></gml:Point>
.. the Google Earth enthusiasts also have their fun! .. 谷歌地球爱好者也有他们的乐趣! Geometries as
KML
几何图形作为
KML
SELECT ST_AsKML(geom) FROM tmp;
st_askml
-----------------------------------------------
<Point><coordinates>1,2</coordinates></Point>
<Point><coordinates>2,4</coordinates></Point>
And the list goes on..!而这样的例子不胜枚举..! In the
PostGIS documentation
there are other fancy ways to serialise geometries.在
PostGIS documentation
还有其他奇特的方法来序列化几何图形。
Demo: db<>fiddle
演示:
db<>fiddle
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