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

Fri Jul 22 11:55:24 EDT 2011

Hi,
This is my ninth week's report.

Things done in the ninth week:
* Debugged the scheduled route code and fixed the segfault.[1]
* Debugging the scheduled route code which produces sub-optimal route.
* Roughly planned a way to include non-scheduled data in scheduled
routing for a multi-modal solution.

Things to be finished by next week:
* Pass all tests for scheduled routing.
* Implement multi-modal routing for all transit types(except walk).

Notes:
* I'm falling behind my proposed schedule by about a week. Have to
catch up in the coming week.

Thanks,
J Kishore kumar.

[1] - https://github.com/pgRouting/pgrouting/commit/0744c589b13492171554603a432c666723161e11

On Fri, Jul 15, 2011 at 9:32 PM, Kishore Kumar <justjkk at gmail.com> wrote:
> 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
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>