[pgrouting-users] Isochronous

[Stephen V. Mather]

Looks awesome Ian,


I submitted an issue at https://github.com/iant1212/networkReach/issues/2 for adding a license to the repo.


Best,

Steve


[http://sig.cmparks.net/cmp-ms-90x122.png] Stephen V. Mather
GIS Manager
(216) 635-3243 (Work)
clevelandmetroparks.com<http://www.clemetparks.com/>



________________________________
From: pgrouting-users-bounces at lists.osgeo.org <pgrouting-users-bounces at lists.osgeo.org> on behalf of Ian Tangert <itangert at gmail.com>
Sent: Tuesday, March 18, 2014 9:05 PM
To: pgRouting users mailing list
Subject: Re: [pgrouting-users] Isochronous

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<mailto:daniel at georepublic.de>> wrote:



On Wed, Mar 19, 2014 at 2:32 AM, Valeria Mu?oz <valemunoz at gmail.com<mailto: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





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eMail: daniel.kastl at georepublic.de<mailto:daniel.kastl at georepublic.de>
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