[Qgis-user] Applying cumulative usage to road sections

[Andrew Harfoot]

I think this can be solved in two stages:

1. Given the transport network, source and destination locations, a 
shortest path calculation run repeatedly should generate a series of 
routes. Commonly these functions output the route in terms of a list of 
the network sections to follow.

Options for doing this calculation in QGIS include: PostGIS (pgRouting), 
Spatialite, GRASS v.net functions, QGIS Road Graph plugin

2. Once the routes have been generated, then they can be combined and 
summarised to generate the total weight traversing each network section, 
which would probably be as a new table that would be joined back to the 
network. This step could be done within a database (PostGres, Spatialite 
etc.), in core QGIS, or even Excel.

Cheers,

Andy


On 15/01/2017 21:07, rossnixon wrote:
> I don't know if the following can be solved with a QGIS plugin. In MapInfo it
> requires a 1500 Euro add-on.
> But perhaps someone has had a similar problem in the past? Maybe with road
> networks, or watercourse volumes?
>
> I would like to calculate the total 'weight' of goods which will travel
> across *each* road section.
> Goods will arrive at the closest road section, and then travel along
> subsequent road sections to the destination. So, road sections nearest the
> destination will have multiple loads travelling over it which need to be
> added together. Example image attached.
> <http://osgeo-org.1560.x6.nabble.com/file/n5303505/road_usage_problem.jpg>
>
>
>
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-- 
Andy Harfoot

GeoData Institute
University of Southampton
Southampton
SO17 1BJ

Tel:  +44 (0)23 8059 2719

www.geodata.soton.ac.uk