[pgrouting-users] Find vertices away from a specified distance

[Ian Tangert]

Raghavan,

You can do this with the Driving Distance functions.  Also, have a look at
the SQL here https://github.com/iant1212/networkReach and here
https://github.com/GregersP/networkReach.  These are examples of returning
all edges for a given distance from a node, you could modify these slightly
to return your vertices, and use your lat/lon to find the closest vertex to
start from.

-ian


On Tue, Apr 22, 2014 at 1:31 AM, Raghavan Krishnasamylakshmanaperumal <
rkrish20 at uic.edu> wrote:

> Hi All,
>
> I am experimenting with Chicago runner's GPS traces(collected from
> Runkeeper.com). I like to know if the following problem can be solved using
> pgRouting.
>
> I have created a graph using pgr_nodeNetwork and pgr_createTopology. Given
> a longitude, latitude point I know to find the vertices closer to that but
> I want to know if given a longitude, latitude point can I find the vertices
> away  from a specified distance. Distance here means the lineStrings length
> in meters.
>
> For example I have a longitude/latitude and want to know all the vertices
> 500meters away from the given longitude/latitude point. Are there functions
> available in pgRouting to infer such vertices?
>
> --
> Thanks and Regards,
> Raghavan KL
>
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