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

Kishore Kumar justjkk at gmail.com
Fri Aug 12 14:34:45 EDT 2011 

Hi,
This is my twelfth weekly report.

Things done in the twelfth week:
*  Implemented All pair shortest path algorithm as a separate branch.[1]
* Used APSP in finding closure of shortest time heuristic.[2]
* Implementing multi-modal routing.

Things to be done by 15th August:
* Finish implementing multi-modal routing.

Things to be done for next week:
* Start writing documentation, Code refactoring.

[1] - https://github.com/pgRouting/pgrouting/tree/apsp-johnson
[2] - https://github.com/pgRouting/pgrouting/commit/cb297ca2cd7d34820d063367fb31b78b5e83c8ce

Thanks & Regards,
J Kishore kumar.

On Sat, Aug 6, 2011 at 1:36 AM, Kishore Kumar <justjkk at gmail.com> wrote:
> Hi,
> This is my eleventh week's report.
>
> Things done in the eleventh week:
> * Implementing Johnson All Pairs Shortest Paths algorithm[1] for
> computing shortest path heuristic in scheduled route algorithm.
>
> Things to be finished by next week:
> * Finish implementation of Multimodal routing.
>
> [1] - http://www.boost.org/doc/libs/1_46_0/libs/graph/doc/johnson_all_pairs_shortest.html
>
> Thanks,
> J Kishore kumar.
>
> On Sat, Jul 30, 2011 at 12:48 AM, Kishore Kumar <justjkk at gmail.com> wrote:
>> Hi,
>> This is my tenth week's report.
>>
>> Things done in the tenth week:
>> * Fixed Sub-optimal routing in the scheduled routing.[1]
>> * 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.
>>
>> [1] - https://github.com/pgRouting/pgrouting/commit/f8dc0f455905d9dd4dde5b6b0cd03e61738d7c5d
>>
>> 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
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>

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