PostGIS
Name
AddEdge — Adds a linestring edge to the edge table and associated start and end points to the point nodes table of the specified topology schema using the specified linestring geometry and returns the edgeid of the new (or existing) edge.
Description
Adds an edge to the edge table and associated nodes to the nodes table
of the specified toponame schema using the specified linestring
geometry and returns the edgeid of the new or existing record. The newly
added edge has "universe" face on both sides and links to itself.
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Performed by the GEOS module.
Availability: 2.0.0
Examples
SELECT topology.AddEdge('ma_topo', ST_GeomFromText('LINESTRING(227575.8 893917.2,227591.9 893900.4)', 26986) ) As edgeid;
-- result-
edgeid
--------
1
SELECT topology.AddEdge('ma_topo', ST_GeomFromText('LINESTRING(227591.9 893900.4,227622.6 893844.2,227641.6 893816.5,
227704.5 893778.5)', 26986) ) As edgeid;
-- result --
edgeid
--------
2
SELECT topology.AddEdge('ma_topo', ST_GeomFromText('LINESTRING(227591.2 893900, 227591.9 893900.4,
227704.5 893778.5)', 26986) ) As edgeid;
-- gives error --
ERROR: Edge intersects (not on endpoints) with existing edge 1