Re: [thredds] FMRC strange missing data regions

• To: THREDDS Users <thredds@xxxxxxxxxxxxxxxx>
• Subject: Re: [thredds] FMRC strange missing data regions
• From: John Maurer <jmaurer@xxxxxxxxxx>
• Date: Thu, 13 Feb 2014 12:15:28 -1000

OK, when I convert our files from NetCDF-4 (Classic) to NetCDF-3, the
problem goes away. Could this be a bug in TDS/FMRC? Is there some
additional TDS configuration I can try to keep our files in NetCDF-4? We
are running TDS 4.3.20 - 20131125.1409.
Thanks,
John


On Thu, Feb 13, 2014 at 10:36 AM, John Maurer <jmaurer@xxxxxxxxxx> wrote:

> Hi TDS folks,
> I'm seeing a strange problem with some of our new regridded ROMS ocean
> forecast models that I'm hoping somebody can help me with. At certain time
> steps, some regions are displaying values of 9.96921E36. From my
> understanding, this is the value assigned (by NetCDF?, OPeNDAP?, TDS?) when
> there was no data value. However, I can confirm in each of my NetCDF files
> that the same slices contain valid data values. So the problem seems to
> stem from the TDS side of things, where I am serving these as a Forecast
> Model Run Collection (FMRC). Furthermore, I have already assigned a
> _FillValue and missing_value of NaN, so the 9.96921E36 issue is something
> else. More pieces to the puzzle are: (1.) no matter what file I test with,
> it always occurs at the same time steps and regions; (2.) it shows up in
> all variables (temp, salt, u, v); (3.) you can see this in Godiva2/ncWMS,
> NetCDF Subset Service, and OPeNDAP. Ideas?? I'm stumped.
>
> Here is my TDS testbed for this; I have been focusing specifically on the
> Best Time Series:
>
>
> http://oos.soest.hawaii.edu/thredds-test/catalog/hioos/roms_forec/hiig/catalog.html
>
> Godiva2 will show you an example of the problem if you navigate to
> sea_water_potential_temperature on Feb 19 2014 at 18:00 at 0.25 meters
> depth. As shown in the example image attached, there is a black rectangle
> in the southeast corner where the values are all 9.96921E36. You can click
> there to confirm this value is returned. (Strangely the "test image" for
> the same day does not have this problem...)
>
> Here is an OPeNDAP call within that same time/lat/lon/depth which shows
> the 9.96921E36 values:
>
>
> http://oos.soest.hawaii.edu/thredds-test/dodsC/hioos/roms_forec/hiig/ROMS_Hawaii_Regional_Ocean_Model_best.ncd.ascii?temp[14][0][0:1:10][284:1:294]
>
> I have staged a gzipped NetCDF file (1.4 GB) and TDS catalog via ftp for
> you to test with:
>
> ftp.soest.hawaii.edu
> user: anonymous
> pass: <your e-mail address>
> cd jmaurer/unidata/
> get ocn_mod_hiig.xml
> get hiig_forec_20140208.nc.gz
>
> Thanks in advance for your time on this!
> Cheers,
> John Maurer
> Pacific Islands Ocean Observing System (PacIOOS)
> University of Hawaii at Manoa
>

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  • [thredds] FMRC strange missing data regions
    • From: John Maurer