Roland,
As Don say my ncml is pretty complex because is doing many things at
the same time (fixing variables units; renaming variables and
dimension; union and joinExisting aggregations)
Attached, you can find a commented version of the ncml.
Antonio
(I'm Mr Cofiño and also Dr. Cofiño, but I prefer Antonio ;) )
--
Antonio S. Cofiño
Grupo de Meteorología de Santander
Dep. de Matemática Aplicada y
Ciencias de la Computación
Universidad de Cantabria
http://www.meteo.unican.es
El miércoles, 06 de noviembre de 2013 17:31:29, Roland Schweitzer -
NOAA Affiliate escribió:
Thanks, Don. I didn't look closely enough at the URL to see it was a
fileServer URL and not an OPeNDAP URL.
Roland
On Wed, Nov 6, 2013 at 10:28 AM, Don Murray <don.murray@xxxxxxxx
<mailto:don.murray@xxxxxxxx>> wrote:
Hi Roland-
Another way you can define the ensemble dimension (in addition
to/instead of) is to use the CDM's _CoordinateAxisType attribute
_CoordinateAxisType: "Ensemble";
Less CF'y, but guaranteed to work. ;-)
I thought I had an NcML example, but I don't. Antonio's is pretty
complex:
http://www.meteo.unican.es/__thredds/fileServer/WRFUC/__2013110412/oper_gfs_mgrama___2013110412_d02.ncml
<http://www.meteo.unican.es/thredds/fileServer/WRFUC/2013110412/oper_gfs_mgrama_2013110412_d02.ncml>
Your's will depend on the structure of your files. The simplest
is to have 1 variable/1 ensemble per file.
Don
On 11/6/13 8:48 AM, Roland Schweitzer - NOAA Affiliate wrote:
Cofiño and Don,
Thanks much for the input and the examples. This is extremely
helpful.
It will take me a while to experiment with the examples and
understand
the implications for what we are trying to accomplish.
In particular, I'm going to use the examples to try to build
my own
ensembles from separate files using NCML. Cofiño, if you can
share a
bit of your NCML that would be a great.
Thanks. I'll try to remember to report back anything I learn
with my
experiments that might be useful.
Roland
On Wed, Nov 6, 2013 at 9:24 AM, Don Murray (NOAA Affiliate)
<don.murray@xxxxxxxx <mailto:don.murray@xxxxxxxx>
<mailto:don.murray@xxxxxxxx <mailto:don.murray@xxxxxxxx>>> wrote:
All-
This provides an example of the different ways that an
ensemble
dimension can be used and that the CDM can handle. For
Antonio's
example, the dimension ordering is:
float tas(ensemble=5, time1=121, height=1, lat=126,
lon=201);
:_CoordinateAxes = "ensemble time1 height lat lon ";
:standard_name = "air_temperature";
:long_name = "Surface air temperature";
:units = "Celsius";
with ensemble as the leftmost dimension
In the ensemble files I generate, they are:
float Total_precipitation(time=1, ens=11, lat=27,
lon=51);
:_FillValue = 9999.0f; // float
:units = "kg m-2";
:long_name = "Total_precipitation_____Accumulation
(Accumulation for Mixed Intervals) @ surface";
I put time in the leftmost dimension.
The nice thing is that the CDM does not care! You can
structure it
according to your needs.
Don
On 11/5/13 12:59 PM, Cofiño Gonzalez, Antonio Santiago wrote:
Roland,
This is an example with Ensemble coordinate axis
http://www.meteo.unican.es/____thredds/catalog/WRFUC/____2013110412/catalog.html?____dataset=OPERWRF12DatasetScan/____2013110412/oper_gfs_mgrama_____2013110412_d02.ncml
<http://www.meteo.unican.es/__thredds/catalog/WRFUC/__2013110412/catalog.html?__dataset=OPERWRF12DatasetScan/__2013110412/oper_gfs_mgrama___2013110412_d02.ncml>
<http://www.meteo.unican.es/__thredds/catalog/WRFUC/__2013110412/catalog.html?__dataset=OPERWRF12DatasetScan/__2013110412/oper_gfs_mgrama___2013110412_d02.ncml
<http://www.meteo.unican.es/thredds/catalog/WRFUC/2013110412/catalog.html?dataset=OPERWRF12DatasetScan/2013110412/oper_gfs_mgrama_2013110412_d02.ncml>>
Antonio S. Cofiño
Santander Meteorology Group
University of Cantabria
El 05/11/2013, a las 16:45, "Roland Schweitzer - NOAA
Affiliate"
<roland.schweitzer@xxxxxxxx
<mailto:roland.schweitzer@xxxxxxxx>
<mailto:roland.schweitzer@__noaa.gov
<mailto:roland.schweitzer@xxxxxxxx>>
<mailto:roland.schweitzer@
<mailto:roland.schweitzer@>__no__aa.gov <http://noaa.gov>
<mailto:roland.schweitzer@__noaa.gov
<mailto:roland.schweitzer@xxxxxxxx>>>> escribió:
Hi,
I see hints in the Java netCDF API that it can
understand a
grid that
has an ensemble axis. What's not clear to me is
how one
constructs a
netCDF data source (either in the file or via some
sort of TDS
aggregation) that represents the ensemble. The CF
conventions
document doesn't seem say anything about ensembles.
Google is failing me, can anybody offer some
examples or
documentation
links for data sources with an ensemble axis?
Thanks,
Roland
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