Cluster Problem

Topics about the trajectory clustering program for HYSPLIT.
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roscag
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Joined: March 4th, 2019, 6:48 am
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Cluster Problem

Post by roscag » March 4th, 2019, 10:39 am

I’m trying to cluster back trajectories (120-h, 500 m agl, Traj skip=1) in Hysplit4 but the program assigns more than 90 % of the calculated BT to cluster #0 (WARNING:” traj not long enough; traj not clustered” in the CMESSAGE file). I have tried running the cluster analysis several times and I have tried using a few different sets of trajectory files
Thanks for the attention, hope someone helps me

barbara.stunder
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Joined: November 9th, 2012, 4:23 pm
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Re: Cluster Problem

Post by barbara.stunder » March 4th, 2019, 12:17 pm

Please check your trajectories to verify they are at least 120-h long.

Does it work with that same set of trajectories for a shorter duration such as 24-h?

roscag
Posts: 4
Joined: March 4th, 2019, 6:48 am
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Re: Cluster Problem

Post by roscag » March 5th, 2019, 5:13 am

yes, trajectories are 120-h long.
It doesn't work also with shorter trajectories

barbara.stunder
Posts: 299
Joined: November 9th, 2012, 4:23 pm
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Re: Cluster Problem

Post by barbara.stunder » March 5th, 2019, 8:34 am

Please send a subset of the trajectories with a case that fails so I can reproduce the issue.

roscag
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Joined: March 4th, 2019, 6:48 am
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Re: Cluster Problem

Post by roscag » March 7th, 2019, 9:34 am

Attached a subset of the trajectories used

thanks

barbara.stunder
Posts: 299
Joined: November 9th, 2012, 4:23 pm
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Re: Cluster Problem

Post by barbara.stunder » March 7th, 2019, 10:00 am

I don't see the attachment. Please try again.

roscag
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Re: Cluster Problem

Post by roscag » March 8th, 2019, 5:32 am

Please, see a new attached
thanks
Attachments
fdump_2.zip
(722.15 KiB) Downloaded 20 times

barbara.stunder
Posts: 299
Joined: November 9th, 2012, 4:23 pm
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Re: Cluster Problem

Post by barbara.stunder » March 8th, 2019, 8:13 am

I just opened several files and none of them are for 120-hours. For example
.fdump14060612 - 8 hours
.fdump14060412 - 9 hours
.fdump14050100 - 0 hours
.fdump14060218 - 3 hours

Hence if you are clustering for 120 hours, none of these I looked at would be used.

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