Thank you. Nicolas! Your explanations and sql example help a lot.
Greg
________________________________
From: Nicolas Ribot <nicolas.ri...@gmail.com>
To: PostGIS Users Discussion <postgis-users@postgis.refractions.net>
Sent: Monday, June 18, 2012 4:31 PM
Subject: Re: [postgis-users] snapping all close-by lines in a set of 500, 000
I find useful to explode a linestring into its points to be able to identify
pseudo-parallel lines: st_distance is not enough as perpendicular, touching
lines will return 0 for the distance though they are not close to each other at
each location.
If all linestring points are within a given distance to a line, then chances
are good these 2 lines are aligned.
...
Nicolas
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