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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Hi Akhil, Nathan,
As of right now there are 146k records in that dataset aggregation, which
would be quite a large dataset to download in 1 query. The easiest method
to streamline the data into your workspace would likely be through the
openDAP protocol (options available in python -- see below example -- and
matlab eg. ncread function). This allows you to isolate the data you're
interested in w/o downloading the entire repository or download the data
variable by variable via openDAP and save it locally if you like. Feel
free to email directly if you have further questions regarding our data!
Thanks,
Spicer Bak
Research Coastal Engineer
USACE Field Research Facility
python example below:
In[2]: import netCDF4 as nc
In[3]: ncfile = nc.Dataset('
https://chlthredds.erdc.dren.mil/thredds/dodsC/frf/oceanography/waves/waverider-26m/waverider-26m.ncml
')
In[4]: ncfile.variables.keys()
Out[4]:
[u'station_name',
u'waveFrequency',
u'waveDirectionBins',
u'nominalDepth',
u'latitude',
u'longitude',
u'waveHs',
u'waveTp',
u'waveTpfb',
u'waveTm',
u'waveTm1',
u'waveTm2',
u'wavePeakDirectionPeakFrequency',
u'waveMeanDirection',
u'waveMeanDirectionPeakFrequency',
u'wavePrincipleDirection',
u'time',
u'gaugeDepth',
u'qcFlagE',
u'qcFlagD',
u'directionalPeakSpread',
u'spectralWidthParameter',
u'waveDirectionEstimator',
u'waveEnergyDensity',
u'directionalWaveEnergyDensity',
u'waveA1Value',
u'waveB1Value',
u'waveA2Value',
u'waveB2Value']
In[5]: ncfile['time'][:]
Out[5]:
array([ 1.21148064e+09, 1.21148244e+09, 1.21148424e+09, ...,
1.51778088e+09, 1.51778268e+09, 1.51778448e+09])
In[6]: ncfile['waveHs'][:]
Out[6]:
array([ 0.55472255, 0.58538461, 0.5709064 , ..., 1.43545318,
1.45016885, 1.52784443], dtype=float32)
In[7]: ncfile['waveHs'][:].shape
Out[7]: (146391L,)
On Sun, Feb 4, 2018 at 5:58 PM, Nathan Potter <ndp@xxxxxxxxxxx> wrote:
>
> Hi Akhil,
>
> I poked around on the server https://chlthredds.erdc.dren.mil/thredds/
> and I was unable to find any options for netcdf formatted downloads of the
> aggregation:
>
> https://chlthredds.erdc.dren.mil/thredds/dodsC/frf/
> oceanography/waves/waverider-26m/waverider-26m.ncml.html
>
> You can get the individual files, but not all of them in a single file
> response. You may be able to get it to send back a subset of the
> aggregation by manually manipulating the request URL, but I don;’t know how
> to achieve that result.
>
> I am including the THREDDS mailing list (since the server in question is
> an instance of the THREDDS Data Server, TDS) and it may be that someone
> there knows the recipe to get the thing you want.
>
> Sincerely,
>
> Nathan
>
>
> > On Feb 4, 2018, at 1:59 PM, Muhammad Salim, Akhil <
> salima@xxxxxxxxxxxxxxx> wrote:
> >
> > Hi,
> >
> > I was trying to retrieve a netcdf4 formatted data for
> https://chlthredds.erdc.dren.mil/thredds/dodsC/frf/
> oceanography/waves/waverider-26m/waverider-26m.ncml.html but it appears
> that there is only ASCII and Binary options available. Am I doing something
> wrong with my selection of variables or is the netcdf format not available
> for this data? Your help is greatly appreciated.
> >
> > Thank you,
> > Akhil
> >
> >
> > Akhil Salim | PhD Student
> > Coastal Imaging Lab | College of Earth, Ocean and Atmospheric Sciences
> > Oregon State University
> >
> >
> > Virus-free. www.avast.com
>
> = = =
> Nathan Potter ndp at opendap.org
> OPeNDAP, Inc. +1.541.231.3317
>
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>
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--
+++++++++++++++++++++++++++
Spicer Bak, PhD
USACE CHL Field Research Facility
301.332.5577
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