[SoC] Re: Multi-modal public transit routing for pgRouting

Fri Jul 15 12:02:38 EDT 2011

Hi,
This is my eighth week's report.

Things done in the eighth week:
* Refactored scheduled route c++ function with database connecting
code and have a segfaulting code.[1]
* Tried debugging the source of segfault.[2]

Agenda for next week:
* Debug the scheduled route code.
* Integrate nonscheduled routing into scheduled routing algorithm.

Thanks,
J Kishore kumar.

[1] - https://github.com/pgRouting/pgrouting/commit/81ffc1ae1f065fa63e0f22f72e9549ce987a8758
[2] - https://github.com/pgRouting/pgrouting/commit/081607527939a0363fcebcb543b59c6cafe566e9

On Fri, Jul 8, 2011 at 11:34 PM, Kishore Kumar <justjkk at gmail.com> wrote:
> Hi,
> Here is the seventh week's report.
>
> Things done in the seventh week:
> * Learnt a lot about Generic programming, Boost Graph library and Eclipse CDT.
> * Successfully coded astar search on Implicit graphs using Boost library[1].
>
> Pending task:
> * Writing the code to connect user facing SQL function to scheduled
> route c++ function.
>
> [1] - https://github.com/pgRouting/pgrouting/commit/3aa2b4e951c584fa3ae03235f7b2e06379cbb229
>
> Thanks,
> J Kishore kumar.
>
> On Sat, Jul 2, 2011 at 1:29 AM, Kishore Kumar <justjkk at gmail.com> wrote:
>> Hi,
>> Following is the sixth week's report.
>>
>> Things done in the sixth week:
>> * Hibernated code changes to pgRouting's core library.
>> * Read thesis and researched algorithms for solving scheduled routing
>> problem.[1][2][3]
>> * Came up with a plan to use Implicit Graph and directly code using
>> boost library.[4]
>> * Spent a large chunk of time learning to use Boost library using code
>> examples.[5][6][7]
>>
>> Agenda for next week:
>> * Finish overdue task of implementing Scheduled routing.
>> * Write SQL functions and wrappers.
>> * Mid-term deliverable should be ready by this week.
>>
>> Side-notes:
>> * Discovered that the problem I'm trying to solve(and the solution) is
>> a specialization/use-case of Time Dependent Shortest Path which is
>> another ongoing gsoc project[8]. So, the more efficient code/algorithm
>> will replace the other in the coming months.
>>
>> [1] - http://algo2.iti.kit.edu/documents/routeplanning/geisberger_dipl.pdf
>> [2] - http://en.wikipedia.org/wiki/Bellman%E2%80%93Ford_algorithm
>> [3] - http://en.wikipedia.org/wiki/Implicit_graph
>> [4] - http://lists.osgeo.org/pipermail/pgrouting-dev/2011-June/000342.html
>> [5] - https://github.com/wpm/Boost-Implicit-Graph-Example
>> [6] - https://github.com/wpm/Astar-Maze-Solver
>> [7] - http://www.cs.rpi.edu/~beevek/research/astar_bgl04.pdf
>> [8] - https://github.com/pgRouting/pgrouting/tree/gsoc-tdsp
>>
>> Thanks,
>> J Kishore kumar.
>>
>> On Sat, Jun 25, 2011 at 12:36 AM, Kishore Kumar <justjkk at gmail.com> wrote:
>>> Hi,
>>> This is the fifth week's report.
>>>
>>> Things done in the fifth week:
>>> * Finished reading Research Report of OpenTripPlanner.
>>> * Sketched a rough algorithm for scheduled routing which internally
>>> uses pgrouting A-star SQL function or A-star from boost library.
>>>
>>> Related/Unrelated activities:
>>> * Modifying pgRouting core library's A-star function to be more generic.
>>> * Played with OSM API by writing a Ruby on Rails web app that connects
>>> via OAuth.
>>>
>>> Things to be finished by next week:
>>> * Quickly finish or hibernate modifications to pgRouting core library.
>>> * Finish Implementing scheduled routing function.
>>> * Write documentation and tests for the implemented functions.
>>>
>>> Oh, I guess this report looks ugly without any reference links. Hope
>>> to get more links next week.
>>>
>>> Thanks,
>>> J Kishore kumar.
>>>
>>> On Sat, Jun 18, 2011 at 1:43 AM, Kishore Kumar <justjkk at gmail.com> wrote:
>>>> HI,
>>>> This is the fourth week's report for my project.
>>>>
>>>> Things done in the fourth week:
>>>> * Tweaked the pl/pgsql prototype for non-scheduled routing to accept
>>>> GTFS formatted data.[1]
>>>> * Discussed on the list regarding the optimality of the implementation
>>>> and the problems.[2]
>>>> * Worked on the flask app:
>>>>  * generated GTFS for Chennai bus routes with frequency[3]
>>>>  * modified frontend to call non-scheduled routing function and
>>>> display results. Can be tested live here[4]
>>>> * Daniel pointed me to a very useful resource, a research report[5] of
>>>> OpenTripPlanner[6]. Reading it.
>>>>
>>>> Things to be finished by next week:
>>>> * Finish reading [5].
>>>> * Start developing scheduled routing algorithm.
>>>> * Write wrappers and tests for non-scheduled routing.
>>>> * Start writing documentation for wrappers and core functions.
>>>>
>>>> Roadblocks/Issues:
>>>> * The OpenTripPlanner shares the same goal as this project or bigger.
>>>> Need to discuss whether these two projects can help each other in any
>>>> way. Like the possibility of rewriting the routing engine of OTP with
>>>> pgrouting version, etc..
>>>>
>>>> Thanks,
>>>> J Kishore kumar.
>>>>
>>>> [1] - https://github.com/pgRouting/pgrouting/commit/657164066784c06e6ca0d98662d7951e3b096993
>>>> [2] - http://lists.osgeo.org/pipermail/pgrouting-dev/2011-June/000315.html
>>>> [3] - https://github.com/justjkk/dotpath/commit/730120bf602697af1012528730e7f05c28f2fe3a
>>>> [4] - http://busroutemaps.in/mtc-nonsc
>>>> [5] - http://www.nctr.usf.edu/wp-content/uploads/2011/06/77926.pdf
>>>> [6] - http://opentripplanner.com/
>>>>
>>>> On Sat, Jun 11, 2011 at 12:59 AM, Kishore Kumar <justjkk at gmail.com> wrote:
>>>>> Hi,
>>>>> This is the third week's report for my project.
>>>>>
>>>>> Things done in the third week:
>>>>> * Sketched algorithm and table structure for solving Non-scheduled
>>>>> routing problem[1].
>>>>> * Writing a pure pl/pgsql function as a prototype implementing the
>>>>> non-scheduled routing function to test the algorithm and
>>>>> efficiency[2].
>>>>>
>>>>> Things to be finished by next week:
>>>>> * Finalize algorithm for non-scheduled routing using the prototype.
>>>>> * Implement Non-scheduled routing core function either in c if necessary.
>>>>> * Write wrapper SQL functions for Non-scheduled routing function
>>>>> covering major use cases.
>>>>>
>>>>> [1] - http://lists.osgeo.org/pipermail/pgrouting-dev/2011-June/000294.html
>>>>> [2] - https://github.com/pgRouting/pgrouting/commit/169cdf25da6235ccec4a73a8e03a164bfe8f780d
>>>>>
>>>>> On Fri, Jun 3, 2011 at 10:27 PM, Kishore Kumar <justjkk at gmail.com> wrote:
>>>>>> Hi,
>>>>>> Wow, the last week went too fast and I'm presenting my second week report
>>>>>> with this mail.
>>>>>> Things done in the second week:
>>>>>> * Collected more GTFS data through chennai-rail-gtfs[1] project.
>>>>>> * Finalized database topology and confirmed[2] with mentor.
>>>>>> * Wrote a couple of test cases for testing the SQL functions[3].
>>>>>> Things to finish by next week:
>>>>>> * To sketch the public transit routing algorithm as a modified a_star
>>>>>> * To implement sm_public_transit_route function in c.
>>>>>> Roadblocks:
>>>>>> * Couldn't find enough time till today to finish this week's objectives.
>>>>>> This resulted in cutting down on writing tests. Should write tests alongside
>>>>>> implementation.
>>>>>> [1] - https://github.com/justjkk/chennai-rail-gtfs
>>>>>> [2] - http://lists.osgeo.org/pipermail/pgrouting-dev/2011-June/000266.html
>>>>>> [3]
>>>>>> - https://github.com/justjkk/pgrouting/commit/54b5a24fa8b8d88a25d42d161357ea79237861af
>>>>>> Thanks & Regards,
>>>>>> J Kishore kumar.
>>>>>> On Fri, May 27, 2011 at 11:58 PM, Kishore Kumar <justjkk at gmail.com> wrote:
>>>>>>>
>>>>>>> Hi,
>>>>>>> I am J Kishore kumar. My GSoC project aims to add public transport routing
>>>>>>> functionality to the pgRouting library. All project related documents are
>>>>>>> linked and managed through this wiki page[1]. Following is the first week
>>>>>>> report of this project.
>>>>>>> Things done before first week(till May 23rd):
>>>>>>> * Discussed with pgRouting developers regarding the feasibility of the
>>>>>>> project and algorithms.
>>>>>>> * Implemented unit testing infrastructure[2] for testing the existing code
>>>>>>> base.
>>>>>>> * Created a small flask application[3] that uses pgRouting library and
>>>>>>> draws routes on a Openlayers map.
>>>>>>> * Started creating GTFS data for Chennai Railway network[4] to use it in
>>>>>>> writing test cases for this transit library.
>>>>>>> Things done in the first week:
>>>>>>> * Added more trips and stop schedules that are converted from pdf
>>>>>>> documents released by railway authorities to [4].
>>>>>>> * Started with actual transit module code[5] and debugging.
>>>>>>> * Adding more route's trips to [4](yet to commit).
>>>>>>> Things to finish by next week:
>>>>>>> * Discuss with mentor and finalise database topology(current topology is a
>>>>>>> subset of GTFS without support for fare).
>>>>>>> * Write tests for single modal transit route functions(thus deciding what
>>>>>>> are the input and output parameters).
>>>>>>> Roadblocks:
>>>>>>> * Debugging c code written for postgresql functions is very hard. Should
>>>>>>> learn debugging techniques from project developers.
>>>>>>> * Marriage function in family has diverted me from spending more time.
>>>>>>> Will become better in a week.
>>>>>>> Thanks,
>>>>>>> J Kishore kumar.
>>>>>>> http://twitter.com/justjkk
>>>>>>> [1] -
>>>>>>> https://github.com/pgRouting/pgrouting/wiki/Multi-modal-Public-Transit-Routing
>>>>>>> [2]
>>>>>>> - https://github.com/pgRouting/pgrouting/wiki/Automated-Testing-%28Unit-Tests%29
>>>>>>> [3] - https://github.com/justjkk/dotpath
>>>>>>> [4] - https://github.com/justjkk/chennai-rail-gtfs
>>>>>>> [5] - https://github.com/pgRouting/pgrouting/tree/gsoc-multimodal
>>>>>>
>>>>>
>>>>
>>>
>>
>