[postgis-users] break road linestrings intelligently

Sandro Santilli strk at keybit.net
Wed Sep 26 05:00:55 PDT 2012

On Tue, Sep 25, 2012 at 07:43:10PM -0600, Richard Greenwood wrote:

> I break the original linestring into 3 new linestrings, but
> how do I populate the "from" and "to" values? If I know the order of
> the 3 new linestrings it would be very easy to calculate the new
> values based on the length of each new linestring, eg. line #1
> 100-240, line#2 241-385, line #3 386-500 or some such thing.

What I've been doing in topology for determining the order has been
comparing the location of a point of each substring against the parent


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