【Postgres】空间计算

select * from eploygon;

select * from geometry_columns where f_table_name='eploygon';



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SELECT ST_GeomFromText('polygon ((117.812658 38.926816,117.813196 38.926622,117.812679 38.925415,117.812065 38.925792,117.812658 38.926816))', 4326 );
 

SELECT
ST_AsText(
    ST_GeomFromText('polygon ((117.812658 38.926816,117.813196 38.926622,117.812679 38.925415,117.812065 38.925792,117.812658 38.926816))', 4326 )
)
 

SELECT gid,geom FROM public.eploygon s where ST_Intersects( ST_GeomFromText('polygon ((117.812658 38.926816,117.813196 38.926622,117.812679 38.925415,117.812065 38.925792,117.812658 38.926816))', 4326 ) , s.geom) ;


SELECT  ST_GeomFromGeoJSON('{"type":"LineString","coordinates":[[0,0],[1,1],[1,1],[2,2]]}'); 



select ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"LineString","coordinates":[[117.8136920928955,38.92978618569792],[117.81523704528809,38.926781511834875],[117.81620264053345,38.92432760043733],[117.81620264053345,38.92247459068792],[117.81620264053345,38.921489637879205],[117.81624555587769,38.92105558653837]]}')),4326);

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--相交切割计算
 SELECT ST_Intersection(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"LineString","coordinates":[[117.8136920928955,38.92978618569792],[117.81523704528809,38.926781511834875],[117.81620264053345,38.92432760043733],[117.81620264053345,38.92247459068792],[117.81620264053345,38.921489637879205],[117.81624555587769,38.92105558653837]]}')),4326) , s.geom) 
  FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"LineString","coordinates":[[117.8136920928955,38.92978618569792],[117.81523704528809,38.926781511834875],[117.81620264053345,38.92432760043733],[117.81620264053345,38.92247459068792],[117.81620264053345,38.921489637879205],[117.81624555587769,38.92105558653837]]}')),4326) , s.geom) ;
    
      SELECT  ST_Intersection(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Polygon","coordinates":[[[117.812658,38.926816],[117.813196,38.926622],[117.812679, 38.925415],[117.812065,38.925792],[117.812658,38.926816]]]}')),4326) , s.geom)  FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Polygon","coordinates":[[[117.812658,38.926816],[117.813196,38.926622],[117.812679, 38.925415],[117.812065,38.925792],[117.812658,38.926816]]]}')),4326) , s.geom) ;
        
        
  SELECT  ST_AsText(ST_Intersection(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Point","coordinates":[117.812658,38.926816]}')),4326) , s.geom)) as a FROM public.eploygon s;

  SELECT  ST_Intersection(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Point","coordinates":[117.812658,38.926816]}')),4326) , s.geom) FROM public.eploygon s
    where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Point","coordinates":[117.812658,38.926816]}')),4326) , s.geom);


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 --相交计算
 SELECT gid,geom FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"LineString","coordinates":[[117.8136920928955,38.92978618569792],[117.81523704528809,38.926781511834875],[117.81620264053345,38.92432760043733],[117.81620264053345,38.92247459068792],[117.81620264053345,38.921489637879205],[117.81624555587769,38.92105558653837]]}')),4326) , s.geom) ;
 
 
  SELECT gid,geom FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Polygon","coordinates":[[[117.812658,38.926816],[117.813196,38.926622],[117.812679, 38.925415],[117.812065,38.925792],[117.812658,38.926816]]]}')),4326) , s.geom) ;


  SELECT gid,geom FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Point","coordinates":[117.812658,38.926816]}')),4326) , s.geom)  ;

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--相交计算测试输出
 SELECT gid,geom FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"LineString","coordinates":[[117.8136920928955,38.92978618569792],[117.81523704528809,38.926781511834875],[117.81620264053345,38.92432760043733],[117.81620264053345,38.92247459068792],[117.81620264053345,38.921489637879205],[117.81624555587769,38.92105558653837]]}')),4326) , s.geom) 
 union
 select 111111 as gid,ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"LineString","coordinates":[[117.8136920928955,38.92978618569792],[117.81523704528809,38.926781511834875],[117.81620264053345,38.92432760043733],[117.81620264053345,38.92247459068792],[117.81620264053345,38.921489637879205],[117.81624555587769,38.92105558653837]]}')),4326);  
 
 
  SELECT gid,geom FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Polygon","coordinates":[[[117.812658,38.926816],[117.813196,38.926622],[117.812679, 38.925415],[117.812065,38.925792],[117.812658,38.926816]]]}')),4326) , s.geom) 
    union
    select 111111 as gid,ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Polygon","coordinates":[[[117.812658,38.926816],[117.813196,38.926622],[117.812679, 38.925415],[117.812065,38.925792],[117.812658,38.926816]]]}')),4326) ; 


  SELECT gid,geom FROM public.eploygon s where ST_Intersects(  ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Point","coordinates":[117.812658,38.926816]}')),4326) , s.geom) 
    union
    select 111111 as gid,ST_GeomFromText(ST_AsText(ST_GeomFromGeoJSON('{"type":"Point","coordinates":[117.812658,38.926816]}')),4326);