[pgrouting-users] Isochronous

[Ian Tangert]

Also there is a query at https://github.com/GregersP/networkReach that will
do that (return edges based on nodes reached) and cover parts of segments
when the cost distance goes beyond a node without reaching another node.
It's based on pgr_drivingDistance() as mentioned.  You might not need such
a level of detail but it's worth a look and I'm always looking for ways to
improve on it if you have any suggestions.

-ian


On Tue, Mar 18, 2014 at 1:45 PM, Daniel Kastl <daniel at georepublic.de> wrote:

>
>
>
> On Wed, Mar 19, 2014 at 2:32 AM, Valeria Muñoz <valemunoz at gmail.com>wrote:
>
>> HI
>>
>> I need to develop a system to generate isochrones according to minutes,
>> you can make this with postgis and how?
>>
>> Valeria
>>
>
>
> Hi Valeria,
>
> The function "pgr_drivingDistance" returns all nodes that can be reached
> from a start point within a certain "cost" (ie. time) and it also returns
> the time need to get to each of these nodes:
>
> http://docs.pgrouting.org/2.0/en/src/driving_distance/doc/dd_driving_distance.html#pgr-driving-distance
>
> The function "pgr_pointsAsPolygon" then returns a polygon that includes a
> set of points:
>
> http://docs.pgrouting.org/2.0/en/src/driving_distance/doc/dd_points_as_polygon.html#pgr-points-as-polygon
>
> The argument is a SQL statement, so if you need isochrones you could run
> it for each isoline.
>
> Daniel
>
>
>
>
>
> --
> Georepublic UG & Georepublic Japan
> eMail: daniel.kastl at georepublic.de
> Web: http://georepublic.info
>
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