[pgrouting-users] Isochronous

[Valeria Muñoz]

thanks!!!


2014-03-18 21:29 GMT-04:00 Stephen Woodbridge <woodbri at swoodbridge.com>:

> Hi Ian,
>
> Can you add a reference to your project here:
>
>    https://github.com/pgRouting/pgrouting/wiki/Writing-functions
>
> under the Friends of pgRouting section.
>
> Thanks,
>   -Steve
>
>
> On 3/18/2014 9:05 PM, Ian Tangert wrote:
>
>> 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 Muñoz <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
>>
>>
>>
>>
>>
>>     --
>>     Georepublic UG & Georepublic Japan
>>     eMail: daniel.kastl at georepublic.de <mailto:daniel.kastl@
>> georepublic.de>
>>
>>     Web: http://georepublic.info
>>
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>>
>>
>>
>>
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