1、创建数据表station,包含geometry字段:
CREATE TABLE "public"."station" (
"name" varchar(20) COLLATE "pg_catalog"."default",
"lat" float4,
"lon" float4,
"geometry" "public"."geometry",
"code" varchar(4) COLLATE "pg_catalog"."default" NOT NULL,
CONSTRAINT "station_pkey" PRIMARY KEY ("code")
)
2、程序创建表格记录时,应用SQL语句:
sSQL = "INSERT INTO station(lat, lon, geometry) " + \
"VALUES(%f,%f, ST_GeomFromText('POINT(%f %f)', 4326))" \
% (lat, lon, lon, lat)
代码用于python,注意最后创建点数据的经纬数值输入采用的是:(lon lat) 的方式
参数:4326,表示的是地理投影座标系统,代表地理座标系中的GCS_WGS_1984
3、如需增补空间座标值,采用SQL语句:update
update station as a set geometry =
ST_GeomFromText('POINT('||(select lon || ' ' || lat from station
where id =a.id)||')', 4326)
该语句可直接在Navicat for PostgreSQL中运行。