[OSGeo Africa] Travel Time Calculation

[Uazukuani]

Hi Rainer

I have worked with GRASS before and will check that out too.
I don't think I will manage R on my own so I will pass.

rgds,
Uazu

On Tue, Jan 15, 2013 at 11:04 AM, Rainer M Krug <r.m.krug at gmail.com> wrote:

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> On 15/01/13 08:24, Paul Scott wrote:
> > On 15/01/2013 08:53, S Coetzer wrote:
> >> Hi
> >>
> >> If I can suggest a quick an easy way to get estimated time travel.
> >>
> >> Get your x,y coordinates from point A to point B and plot it on Google
> maps. Use the GET
> >> DIRECTIONS facility, this would give you an estimated travel time and
> distance along with
> >> several possible alternative routes.
> >>
> >>
> >
> > For a group of GI professionals, I am bitterly disappointed in these
> types of answers. Has
> > anyone heard of Djikstra's algorithm (
> http://en.wikipedia.org/wiki/Dijkstra%27s_algorithm) or
> > a* or Shooting-Star distance algorithms?
> > (http://www.policyalmanac.org/games/aStarTutorial.htm)
> >
> > From that, we can infer that distance * average speed = time right?
> >
> > Come on ladies and gents! Let us foster an environment for new thinking
> and innovation, not a
> > forum for consumption of predefined OTS products.
> >
> > OSGeo = Open Source = hack and pick and modify = change = new = better =
> share.
>
> Well - if there are "out of the box" solutions, why not mention them so
> that they can be used?
> Easier in many regards (although not that satisfying and challenging...)
>
> But here are two ideas:
>
> 1) You could use R. I wouldn't wonder if there is a package for that.
>
> 2) Use GRASS:
> a) Rasterize your road network (NULL values for "not on road")
> b) use r.cost or r.walk to calculate the least cost paths along the road
> network (see
> http://casoilresource.lawr.ucdavis.edu/drupal/book/export/html/96 "Simple
> Comparision of Two
> Least-Cost Path Approaches" for a comparison of the two)
>
> Warning: I haven't used this approach yet, these are just ideas, but they
> could work. To get motre
> info, I would suggest to google and ask on the GRASS user mailing list.
>
> Cheers,
>
> Rainer
>
>
>
> >
> >
> >
> > _______________________________________________ Africa mailing list
> Africa at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/africa
> >
>
>
> - --
> Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
> Biology, UCT), Dipl. Phys.
> (Germany)
>
> Centre of Excellence for Invasion Biology
> Stellenbosch University
> South Africa
>
> Tel :       +33 - (0)9 53 10 27 44
> Cell:       +33 - (0)6 85 62 59 98
> Fax :       +33 - (0)9 58 10 27 44
>
> Fax (D):    +49 - (0)3 21 21 25 22 44
>
> email:      Rainer at krugs.de
>
> Skype:      RMkrug
>
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