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Line direction is created by line draw direction, that is, how the line was originally imputed. i.e. from point a to point b, you then have a direction, if handled as a multi segment line the the individual nodes may all have different draw directions against the overall trend of the line. Modeled logical you could create oo rules for your data base that ...


How about this (assume test is your linestring table): First nodify the linestring, e.g. create vertices at each intersection while keeping the original vertices in tact. CREATE TABLE node AS SELECT id, ST_Node(wkb_geometry) as wkb_geometry FROM test; Count all distinct points in the new linestrings. Substracting the initial number of vertices from noded ...

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