ST_GeomFromGML(text)returnsgeometry ST_AsGML(geometry)returns GMLtext ST_GeomFromKML(text)returnsgeometry ST_AsKML(geometry)returns KMLtext ST_AsGeoJSON(geometry)returns JSONtext ST_AsSVG(geometry)returns SVGtext 还有请记住我们现在数据库中已经有的表: nyc_census_blocks blkid, popn_total, boronam...
ST_GeomFromGML(text) returnsgeometry ST_AsGML(geometry) returns GMLtext ST_GeomFromKML(text) returnsgeometry ST_AsKML(geometry) returns KMLtext ST_AsGeoJSON(geometry) returns JSONtext ST_AsSVG(geometry) returns SVGtext 二、练习 ①'West Village'社区(neighborhood)的面积是多少? SELECT ST_Area(...
//语法 text GeometryType(geometry geomA); //示例 SELECT GeometryType(ST_GeomFromText('LINESTRING(77.29 29.07,77.42 29.26,77.27 29.31,77.29 29.07)')); geometrytype --- LINESTRING //示例 SELECT ST_GeometryType(ST_GeomFromEWKT('POLYHEDRALSURFACE( ((0 0 0, 0 0 1, 0 1 1, 0 1 0, 0 ...
ST_GeomFromGML(text)returns geometry ST_AsGML(geometry)returns GML text ST_GeomFromKML(text)returns geometry ST_AsKML(geometry)returns KML text ST_AsGeoJSON(geometry)returns JSON text ST_AsSVG(geometry)returns SVG ...
PostGIS支持Well-known text(WKT),主要函数有: ST_GeomFromText(text, srid)—— 返回geometry ST_AsText(geometry)—— 返回text ST_AsEWKT(geometry)—— 返回带有srid的text SELECTST_GeomFromText('Point(1 0)',4326), ST_AsText(geom), ST_AsEWKT(geom) ...
YMatrix适用于各种规模设备的数据融合与物联网时序应用场景，本案例以具体的案例来说明YMatrix在PostGIS中...
SELECTname,ST_AsText(geom)FROMgeometriesWHEREname='Collection'; 返回结果就是一个点和一个多边形的集合。 基本操作而已,你是不是也学会了。 几何图形的存储PostGIS支持以多种格式进行几何图形的输入和输出: Well-known text(WKT) Well-known binary(WKB) ...
1）ST_AsMVTGeom函数geometry ST_AsMVTGeom(geometry geom, box2d bounds, integer extent=4096, integer buffer=256, boolean clip_geom=true);2）ST_AsMVT聚合函数bytea ST_AsMVT(anyelement row, text name, integer extent, text geom_name);示例：SELECT ST_AsMVT(q, 'test', 4096, 'geom') FROM (...
ADD COLUMN to_cost double precision, ADD COLUMN rule text, ADD COLUMN isolated integer; 接下来我们把新增的内容填上,这里主要填道路往返的路程花费和起点终点坐标,时间花费和其他暂时不填: UPDATE daolu_simp SET x1 = st_x(st_startpoint(geom)), ...
demo=# INSERT INTO cities (id, the_geom, name) VALUES (1,ST_GeomFromText('POINT(-0.1257 51.508)',4326),'London, England'); demo=# INSERT INTO cities (id, the_geom, name) VALUES (2,ST_GeomFromText('POINT(-81.233 42.983)',4326),'London, Ontario'); ...