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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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See below... John Caron wrote: > > > 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. > Got it. ;-) >> >> 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". True. Any terminology works for me.... >> >> 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? > Im not quite ready for this. I am working out our server issues at the moment, meaning that I am starting to fit this new gridded server stuff into one of our existing server infrastructures called Mantis (Aaron Braeckel's), which currently only serves observations. At the same time, I am thinking NCML, nj22, etc. So a bit more server/request/response work, and I should be able to start using some NCML/nj22 to actually exec some of those requests. And yes, I think that I will want to specify the aggregations in NCML, and then access the various dimensions (runtimes, times, etc) from the Java code, via nj22. ;-) > >> 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. > SOunds likely ;-) Smiles all around. Gimme a bit more time, and we'll get together to discuss where we're going... ;-) >> >> ;-) Thanks John! > > yer welcome!
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