將緯度替換爲經度

Question

我將獲得多邊形幾何作爲顯示第一個經度，緯度的文本...我創建GeoJSON並在小冊子上繪圖...但傳單標準的第一個緯度然後是經度。我正在使用PostGIS如何改變多邊形...如果我有點幾何，這很容易我可以改變st_x,st_y點....但是我想改變到多邊形的整體邊界，我的創建goem是

[[72.96699,31.96872],[72.9679,31.9669]] 

，同時我想作爲

[[31.96872,72.96699],[31.9669,72.9679]]  

整體我查詢轉換爲

(SELECT row_to_json(fc) 
    FROM (SELECT 'FeatureCollection' As type, array_to_json(array_agg(f)) As features 
    FROM (SELECT 'Feature' As type 
     , st_asgeojson(lg.geom , 5 ,0)::json As geometry 
     , row_to_json((SELECT l FROM (SELECT id, distt_name) As l 
     )) As properties 
    FROM (SELECT gid as id, distt_name , geom FROM tbl_districts 
     where distt_name like '%') As lg) As f) 
    As fc) 

Answer 1

• GeoJSON is accepted by Leaflet.

• GeoJSON specifies x,y not y,x. So it's already longitude,latitute。看這裏。

  SELECT ST_AsGeoJSON(ST_MakePoint(1,2)); 
        st_asgeojson    
  -------------------------------------- 
  {"type":"Point","coordinates":[1,2]} 
  (1 row) 
  

你應該使用jsonb_build_object和ST_AsGeoJSON生成GeoJSON的。