将纬度替换为经度

Posted 2023-03-31

【中文标题】将纬度替换为经度

【英文标题】：Replace latitude to longitude

【发布时间】：2017-11-25 14:22:52

【问题描述】：

我将多边形几何图形作为显示第一个经度、纬度的文本......我正在创建 GeoJSON 并在传单上绘图......但传单标准首先是纬度，然后是经度。我正在使用 PostGIS 如何更改多边形...如果我有点几何形状很容易我可以更改 st_x,st_y 为点...。但是我想更改为整体边界多边形，我创建的goem是

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

虽然我想转换为

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

总的来说，我的查询是

(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)

【参考方案1】：

GeoJSON is accepted by Leaflet.

GeoJSON specifies x,y not y,x. So it's already longitude,latitute。看这里。

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

您应该使用jsonb_build_object 和ST_AsGeoJSON 生成GeoJSON。