拓扑元素 — 将拓扑几何转换为拓扑元素。
拓扑元素 TopoElement(
拓扑几何 topo)
;
这是一个完整的自包含工作流程
-- do this if you don't have a topology setup already -- Creates topology not allowing any tolerance SELECT TopoElement(topo) FROM neighborhoods;
-- using as cast SELECT topology.TopoElementArray_Agg(topo::topoelement) FROM neighborhoods GROUP BY city;