[pgrouting-users] Distance matrix using road network

[Laura Kauria]

Thanks, Steve! I need to start first with something easier, since I see
lots of gaps with my skills and this tool(/general pgrouting). I try to
figure out it first in grass and if it goes fine, then pgrouting. Cheers,
Laura


2013/7/24 Stephen Woodbridge <woodbri at swoodbridge.com>

> On 7/24/2013 2:19 PM, Laura Kauria wrote:
>
>> Hi all,
>>
>> I'm new with pgrouting/postgresql and I would need some detailed
>> instructions making distance matrix using road network. Can you lead me
>> to a good source or give some instructions here to get started?
>>
>> Thanks in advance! I have mac and I'd like to use pgrouting via QGIS or
>> grass.
>>
>
> Hi Laura,
>
> I will outline the process below, but you should read the docs for the
> details on how to do the steps:
>
> Say you have ten locations the you want to build a distance matrix for:
>
> 1. map you locations to the nearest edge nearest end node
> 2. for each node call pgr_kdijkstra() with the node as source and the
> remainder of nodes as targets.
> 3. place the values in real8[][] array
> 4. adjust the array to be symmetric ie: a[i,j] == a[j,i] (we only support
> symmetric TSP
> 5. call pgr_tsp(a, start_id [, end_id])
>
> I have no idea how you would do this from QGIS or grass.
>
> Hope this helps,
>   -Steve
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