I'm looking for a way to create so-called one-sided buffers or parallel lines in PostGIS. Example: 1. buffer, 2. one-side, 3. both-sides

alt text http://trac.osgeo.org/geos/raw-attachment/ticket/215/singlesidedbuffer.jpg

I've found some discussion on the mailing list from 2009 and information that it has been implemented in GEOS, but nothing about the current PostGIS status.

In case the function is not implemented yet, do you know any workarounds? Is it possible to cut off one side of a normal buffer?

I'm looking for a way to create so-called one-sided buffers or parallel lines in PostGIS. Example: 1. buffer, 2. one-side, 3. both-sides

I've found some discussion on the mailing list from 2009 and information that it has been implemented in GEOS, but nothing about the current PostGIS status.

In case the function is not implemented yet, do you know any workarounds? Is it possible to cut off one side of a normal buffer?

I'm looking for a way to create so-called one-sided buffers or parallel lines in PostGIS. Example: 1. buffer, 2. one-side, 3. both-sides

alt text http://i.imgur.com/HjGNH.jpg

I've found some discussion on the mailing list from 2009 and information that it has been implemented in GEOS, but nothing about the current PostGIS status.

In case the function is not implemented yet, do you know any workarounds? Is it possible to cut off one side of a normal buffer?

I'm looking for a way to create so-called one-sided buffers or parallel lines in PostGIS. Example: 1. buffer, 2. one-side, 3. both-sides

alt text http://trac.osgeo.org/geos/raw-attachment/ticket/215/singlesidedbuffer.jpg

I've found some discussion on the mailing list from 2009 and information that it has been implemented in GEOS, but nothing about the current PostGIS status.

In case the function is not implemented yet, do you know any workarounds? Is it possible to cut off one side of a normal buffer?