[pgrouting-users] isochrone function

[Ian]

hi all,

i did an isochrone function that i thought might be nice to have in 
pgrouting.  it takes parameters of (lat, lon, distance) and starts at 
the closest point along the closest line (not the closest node) and 
returns lines that can be traversed within the threshold of the distance 
specified including partial lines beyond terminal nodes (using driving 
distance).

right now it is specific to my table names, column names, data 
projection, etc, and i have also added two types to be used in it (it is 
also with postgis 2.0).  but if anyone thinks it might be useful i'd be 
willing to learn how to contribute this.

has anyone done this already or have been working on it?  also this is 
my first sql function so maybe there are things that can be improved.  
is it possible to add attachments to these emails?  if not, what is the 
best way i can share this query so it can be improved or possibly 
contributed?

-ian