[Mobilitydb-users] MobiltyDB for Windows

[Esteban Zimanyi]

Please tell us which version you downloaded, if Mahmoud's function worked
then most probably you had the master version while we are in the process
of preparing the next beta version and thus working on the develop branch.

Furthermore, please tell us which SRID you are using. In order to help you
we need a sample data so we can test the function that is not working for
you. Ideally the sample data should be as small as possible, possibly with
only the one ship you have shown in your screenshot.

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Prof. Esteban Zimanyi
Department of Computer & Decision Engineering  (CoDE) CP 165/15
Universite Libre de Bruxelles
Avenue F. D. Roosevelt 50
B-1050 Brussels, Belgium
fax: + 32.2.650.47.13
tel: + 32.2.650.31.85
e-mail: esteban.zimanyi at ulb.be
Internet: http://cs.ulb.ac.be/members/esteban/
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On Wed, Sep 1, 2021 at 1:56 PM Alan Suc <suc.eleve at ecole-navale.fr> wrote:

> Sir,
>
> Thank you for your answer. I tried yours first but it didn't work, while M
> Sakr's one worked, which is quite strange as I reinstalled MobilityDB last
> week so I guess I should have the most recent version. An other question,
> I'm using dwithin() and |=|but those fonctions seems to don't work. Indeed,
> for the dectection of near miss situation between ships I use dwithin to
> detect ships who came closer than 1000m to the one studied, but this
> function seems to don't work as it also select ships which were at dozens
> of kilometers. Also |=| seems lost as it returns a distance of 0.53 m at
> closest point of approach while QGIS measures 59km for the same line. I
> join a screen capture which, I guess, is more more explicit.
>
> Best Regards,
>
> A. Suc
>
> Le 31/08/2021 à 18:28, Esteban Zimanyi a écrit :
>
> Please find enclosed a new version of the function since the suffixes for
> the subtypes in MobilityDB have been changed to _inst, _instset, _seq, and
> _seqset for better readability. Usage examples of the function are also
> included in the file.
>
> On Tue, Aug 31, 2021 at 4:53 PM Mahmoud SAKR <mahmoud.sakr at ulb.ac.be>
> wrote:
>
>> [...]
>>
>
>
>> I understand that you got a sequence of (location, timestamp) pairs, from
>> which you want to construct a trajectory. But you want to split into
>> multiple trajectories whenever there is a big gap (in time or in distance)
>> between two consecutive points.
>>
>> Enclosed is an SQL function to do this.
>>
>
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