It doesn't matter it's grid or ugrid for TDS in terms of basic DAP data
access. That has been said, a lot of functionalities of TDS, such as
aggregation, assume the data structures in the netcdf file is in the regular
grid.
As for creating a 'ugrid' netcdf, it's out of the scope of TDS. The UGRID
conventions tool Kyle got involved serves this purpose pretty well. You may
want to take a look on existing 'ugrid' netcdf files and see if the
structure could work out for your purpose.
Guan
-----Original Message-----
From: thredds-bounces@xxxxxxxxxxxxxxxx
[mailto:thredds-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Roy Mendelssohn
Sent: Wednesday, April 16, 2014 1:46 PM
To: Kyle Wilcox
Cc: THREDDS community
Subject: Re: [thredds] Irregular grids
Hi Kyle:
Is there existing code to write to ugrid? And is Ugrid and add-on to
thredds or out of the box?
Thanks,
-Roy
On Apr 16, 2014, at 9:55 AM, Kyle Wilcox <kyle@xxxxxxxxxxxxxxx> wrote:
> As part of the SURA COMT project, we converted all unstructured output
into the NetCDF UGRID format[1].
>
> The WCS/WMS/NetcdfSubset services in THREDDS will not work on the UGRID
datasets. DAP and ISO will work just fine.
>
> An option for WMS visualization is to use sci-wms[2].
>
> Hope that helps.
>
> [1] https://github.com/ugrid-conventions/ugrid-conventions
> [2] https://github.com/asascience-open/sci-wms
>
>
> On Wed, Apr 16, 2014 at 12:30 PM, Joe Lee <hyoklee@xxxxxxxxxxxx> wrote:
> Hi, Roy!
>
> Thanks for clarifying the real issue. I'm also interested in the
"standard" way so that we can improve our hdf4_handler and h4tonccf tool.
>
> So, do you want to write your product in NetCDF UGRID that THREDDS can
visualize as discussed in [3]?
>
> If so, based on [3], it seems that there's a standard way to write a
NetCDF UGRID and visualize it [4].
>
> [3]
> https://groups.google.com/forum/#!topic/ugrid-interoperability/9kDNF0X
> u43w [4]
> http://comt.sura.org/thredds/godiva2/godiva2.html?server=http://comt.s
> ura.org/thredds/wms/data/comt_1_archive/inundation_tropical/MDL_SLOSH/
> Hurricane_Ike_final_run_egm3
>
>
> -----Original Message-----
> From: Roy Mendelssohn [mailto:roy.mendelssohn@xxxxxxxx]
> Sent: Wednesday, April 16, 2014 11:03 AM
> To: Joe Lee
> Cc: THREDDS community; Kent Yang; Ted Habermann
> Subject: Re: [thredds] Irregular grids
>
> I can write it to netcdf, but that doesn't mean that i have written it in
some "standard" way, nor that thredds can read it (or thredds say with a
ugrid extension). That is really my question.
>
> -Roy
>
>
> On Apr 16, 2014, at 8:53 AM, Joe Lee <hyoklee@xxxxxxxxxxxx> wrote:
>
> > Hi, Roy!
> >
> > Have you tried h4tonccf [1] or OPeNDAP Hyrax hdf4_handler [2] on your
product?
> >
> > May I download and look at your data product so that I can test with
our tools as well?
> >
> > We'd like to help you if your HDF4 product cannot be converted to or
served as NetCDF successfully.
> >
> > [1] http://www.hdfeos.org/software/h4cflib.php
> > [2] http://www.hdfeos.org/software/hdf4_handler.php
> >
> >
> > -----Original Message-----
> > From: thredds-bounces@xxxxxxxxxxxxxxxx
> > [mailto:thredds-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Roy
> > Mendelssohn
> > Sent: Wednesday, April 16, 2014 10:43 AM
> > To: THREDDS community
> > Subject: [thredds] Irregular grids
> >
> > Hi All:
> >
> > I am dealing with some L3 binned data, in what I will call the "Seawifs
format". The data is stored in an HDF file as a VData - basically one long
array or table if you want. The reason it is done this way is the "grid" is
irregular, that is each row has a varying number of columns. I can read the
data fine in python, but I am trying to find out what options I have for
serving it. Clearly one option is to grid the data at a somewhat coarser
resolution, and i might do that. But my questions are:
> >
> > 1. Is there a standard way to write this to a netcdf file (I can
calculate the lat-lon at the center of each bin)?
> >
> > 2. Can such a file be served by thredds, and if so what would it take.
> >
> > 3. If it can be served by thredds, does what gets returned make sense
to someone not familiar with what is going on (basically we deal with
unsophisticated users, it must be real clear what is being returned to
them).
> >
> > Thanks for any help.
> >
> > -Roy M.
> >
> >
> > **********************
> > "The contents of this message do not reflect any position of the U.S.
Government or NOAA."
> > **********************
> > Roy Mendelssohn
> > Supervisory Operations Research Analyst NOAA/NMFS Environmental
> > Research Division Southwest Fisheries Science Center
> > 1352 Lighthouse Avenue
> > Pacific Grove, CA 93950-2097
> >
> > e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
> > voice: (831)-648-9029
> > fax: (831)-648-8440
> > www: http://www.pfeg.noaa.gov/
> >
> > "Old age and treachery will overcome youth and skill."
> > "From those who have been given much, much will be expected"
> > "the arc of the moral universe is long, but it bends toward justice"
-MLK Jr.
> >
> > _______________________________________________
> > thredds mailing list
> > thredds@xxxxxxxxxxxxxxxx
> > For list information or to unsubscribe, visit:
> > http://www.unidata.ucar.edu/mailing_lists/
>
> **********************
> "The contents of this message do not reflect any position of the U.S.
Government or NOAA."
> **********************
> Roy Mendelssohn
> Supervisory Operations Research Analyst NOAA/NMFS Environmental
> Research Division Southwest Fisheries Science Center
> 1352 Lighthouse Avenue
> Pacific Grove, CA 93950-2097
>
> e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
> voice: (831)-648-9029
> fax: (831)-648-8440
> www: http://www.pfeg.noaa.gov/
>
> "Old age and treachery will overcome youth and skill."
> "From those who have been given much, much will be expected"
> "the arc of the moral universe is long, but it bends toward justice" -MLK
Jr.
>
> _______________________________________________
> thredds mailing list
> thredds@xxxxxxxxxxxxxxxx
> For list information or to unsubscribe, visit:
> http://www.unidata.ucar.edu/mailing_lists/
>
**********************
"The contents of this message do not reflect any position of the U.S.
Government or NOAA."
**********************
Roy Mendelssohn
Supervisory Operations Research Analyst
NOAA/NMFS
Environmental Research Division
Southwest Fisheries Science Center
1352 Lighthouse Avenue
Pacific Grove, CA 93950-2097
e-mail: Roy.Mendelssohn@xxxxxxxx (Note new e-mail address)
voice: (831)-648-9029
fax: (831)-648-8440
www: http://www.pfeg.noaa.gov/
"Old age and treachery will overcome youth and skill."
"From those who have been given much, much will be expected"
"the arc of the moral universe is long, but it bends toward justice" -MLK
Jr.
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