[pgrouting-dev] http://docs.pgrouting.org/dev/doc/src/developer/sampledata.html#sampledata

[Daniel Kastl]

On Mon, Jul 8, 2013 at 10:27 PM, Dave Potts <dave.potts at pinan.co.uk> wrote:

> On 08/07/13 14:27, Stephen Woodbridge wrote:
>
>> On 7/8/2013 5:59 AM, Dave Potts wrote:
>>
>
> hi Steve
>
> What bit of software was used to visualise the existing network?  Is it
> based on a screen shot from something like  mapserver?
>
> I for one am very great full to the vast amount of effort that has been
> put in to version  2.0.



Hi Steve,

With the sample data I was a bit lazy, I must admit.
Steve had this network image and a table, so I just used it.

I know that it doesn't work so well for TSP and Driving Distance. Some
larger network would be better.
But then the SQL to copy and paste also becomes much larger.

Well, I'm glad if someone could provide a better but still simple sample
network for the documentation.
It's not so easy to find something that covers all algorithms and is still
simple.
Right now it's still the better option than no sample network ;-)

Daniel



>
>
> Dave.
>
>
>
>
>  hi List,
>>>
>>> Is it possible to rewrite the sample data network to (
>>> http://docs.pgrouting.org/dev/**doc/src/developer/sampledata.**
>>> html#sampledata<http://docs.pgrouting.org/dev/doc/src/developer/sampledata.html#sampledata>
>>> )to include a more distinctive data sample?
>>>
>>> I have been trying to use it to provide an input data sample for a TSP
>>> problem.  I had problems because the current network generates several
>>> routes that all look identical to the TSP so if you attempt to do some
>>> topological work, you end up with several identicial routes selections.
>>>
>>> For example the selection
>>>
>>> SELECT  seq,  id  FROM pgr_tsp('{{0,1,3,3},{1,0,2,2},**
>>> {3,2,0,2},{3,2,2,0}}',X);
>>>
>>> where x  is in the range 0-3 will generate 4 paths of which the profile
>>> is two routes of 121 or 212 measured in distance unit terms
>>>
>>>
>> Dave,
>>
>> Daniel was trying to use one sample data for all the examples and in
>> general this as worked well for most of the examples where we are computing
>> simple routes. I think the driving distance and tsp examples probably need
>> to have a slightly larger graph too adequately demonstrate the function.
>>
>> If you have another graph that you think might be more appropriate for
>> demonstrating both of these commands commands I think there is room for it.
>> I know Daniel and I are both tied up at the moment on funded project work
>> at the moment, but it you were inclined to make an additional sample graph
>> and update the docs we would love to get a pull request to help out the
>> release.
>>
>> We have put a lot of effort into having complete documentation coverage
>> of all the functions in 2.0. We still have some work to do but this is an
>> area that we would be happy to get help on. If you don't have time to do
>> this at least open a ticket so it gets tracked.
>>
>> Best regards,
>>   -Steve
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>>
>
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-- 
Georepublic UG & Georepublic Japan
eMail: daniel.kastl at georepublic.de
Web: http://georepublic.de
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