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Re: Few questions...
- Subject: Re: Few questions...
- Date: Tue, 05 Sep 2006 14:15:28 -0600
Rob Weingruber wrote:
Hi John -
Im back at it.....
Ok, so after perusing GridDatatype andGridCoordSystem, I have a few
questions:
1. Can you explain the ensemble to me? Is that for climatologies? (if
so, i understand
the ensemble ;-).
models are sometimes run several (many) times with slight variations of the input, these are called
"ensemble" runs. The set of results then show the fuuture in a more statistically
meaningful way. these results could be represented as an extra "ensemble" dimension.
we havent yet tested this with any real world examples yet.
2. Is the RunTime the same as what I termed the 'generate time'? If so,
might be
better to use 'gen time' rather than run time, since a model run may
have a gen time
of 12Z, but it happens to be running at 12:18Z (my $0.02 ;-).
im not sure, i could also imagine the argument "a model run may have a runtime of
12Z, but it happens to be generated at 12:18Z".
maybe we can have a bakeoff, i've also heard "analysis time".
Related to NCML:
3. Can I use the 'Forecast Model Run' yet? If so, whudoIdo?
we are just finishing the "Forecast Model Run Collection" (fmrc) aggregation, you can try
it out if you want, but i havent written docs yet. (there was an older "Forecast Model
Run" aggregation which is now deprecated.)
lets pick a simple dataset you want to do, and try serving it through the TDS:
1. have a look at the motherlode test server models
(http://motherlode.ucar.edu:9080/thredds/idd/models.html)
2. install latest 3.13 development version of thredds.war (from
http://www.unidata.ucar.edu/downloads/thredds/index.jsp)
3. pick a simple dataset, i will show you what the catalog should be.
4. ill try to get some docs written.
now that ive said all this, maybe you just want to access the fmrc aggregation
dataset from java code?
4. How can I aggregate with the 2D time coordinate? I looked at the
joinExisting
doc http://www.unidata.ucar.edu/software/netcdf/ncml/v2.2/Aggregation.html,
and I still dunno what to do....
its likely you need the fmrc aggregation.
;-) Thanks John!
yer welcome!