Receiving error 500 from download data

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Lucas Monteiro de Barros Lança

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Jul 25, 2025, 8:45:53 AMJul 25

to HYCOM.org Forum

I'm trying to download data from ESPC with the url (Ex:"https://ncss.hycom.org/thredds/ncss/grid/ESPC-D-V02/ssh?var=surf_el&north=-6&west=-52&east=-25&south=-32&disableProjSubset=on&horizStride=1&time=2024-08-28T03%3A00%3A00Z&vertCoord=&accept=netcdf4")and since last week I'm receiving a message error 500. A co-worker that is connected to the same wifi router is trying to download data manually and having problem too. Is there some problem if we are downloading at same time? If don't, what can be the problem? Thank you for your support

Michael McDonald

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Jul 27, 2025, 2:34:12 PMJul 27

to Lucas Monteiro de Barros Lança, HYCOM.org Forum

Lucas,

If it is just this one date via the aggregation (which I am also having trouble accessing) then you should try to query the date/time directly via the unaggregated dataset listing that also has an OPENDAP/NCSS access method.

e.g., see the "* Unaggregated *" ALL DATA link at the top of the thredds root catalog (https://ncss.hycom.org/thredds)

https://tds.hycom.org/thredds/catalog/datasets/ESPC-D-V02/data/archive/2024/catalog.html?dataset=datasets/ESPC-D-V02/data/archive/2024/US058GCOM-OPSnce.espc-d-031-hycom_fcst_glby008_2024081712_t0015_ssh.nc

The trick is computing the tau (tHHHH) offset to get the right time you are seeking. The model is run at 12Z so that is the start of the tau offset. if you want 03Z then that is from the previous date/run 20240827 with a tau of t0015 (e.g., your original date/time request, time=2024-08-28T03:00:00Z). I think I got this right...

e.g., a much simplified NCSS URL with no time defined, as there is only a single time in the direct file method.

https://ncss.hycom.org/thredds/ncss/datasets/ESPC-D-V02/data/archive/2024/US058GCOM-OPSnce.espc-d-031-hycom_fcst_glby008_2024081712_t0015_ssh.nc?var=surf_el&north=-6&west=-52&east=-25&south=-32&accept=netcdf

Let us know if you are encountering these NCSS aggregation issues for other dates/time or if this was the only one you have come across.

On Fri, Jul 25, 2025 at 8:46 AM Lucas Monteiro de Barros Lança <lucas...@gmail.com> wrote:

I'm trying to download data from ESPC with the url (Ex:"https://ncss.hycom.org/thredds/ncss/grid/ESPC-D-V02/ssh?var=surf_el&north=-6&west=-52&east=-25&south=-32&disableProjSubset=on&horizStride=1&time=2024-08-28T03%3A00%3A00Z&vertCoord=&accept=netcdf4")and since last week I'm receiving a message error 500. A co-worker that is connected to the same wifi router is trying to download data manually and having problem too. Is there some problem if we are downloading at same time? If don't, what can be the problem? Thank you for your support

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