[postgis-users] topology point - linestring

[matze09]

hi all,

within a linear referencing task i need the shortest distances of all points
to the linestring.
that itself wouldn't be a problem with st_line_locate_point and st_distance,
but i also need to know the topological position of the point relative to
the linestring (left, right or on the linestring).

e.g. the linear referencing tool in ArcGIS indicates the relative location
of a point to a line by means of a (un-)signed distance value (the tool
returns positive and negative distance values).

i haven't found any postgis function yet for this problem.
does anyone know of a function which solves this? or a workaround which runs
as quick as possible?

thanks in advance and
best regards,

matthias
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