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

[Kishore Kumar]

Hi,
This is my tenth week's report.

Things done in the tenth week:
* Fixed Sub-optimal routing in the scheduled routing.
* Implementing multi-modal routing.

Things to be finished by next week:
* Complete implementation of multimodal routing.
* Write documentation on using the functions.

Roadblocks:
* I'm attending Yahoo! Openhack this weekend. Must be back on track by Monday.

Thanks,
J Kishore kumar.

On Fri, Jul 22, 2011 at 9:25 PM, Kishore Kumar <justjkk at gmail.com> wrote:
> 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
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>