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Tom, thanks for valuable input. Too many questions for a simple email. It would probably be better to have a telecon with you and the Wisc folks and a wider group at NCDC to have better interaction. I'm on my way to London for a CEOS meeting but back next week. How about a telecon next week? (I'm off to the plane now so may not be able to respond...) Regards, John ----- Original Message ----- From: Tom Whittaker <whittaker@xxxxxxxx> Date: Tuesday, July 20, 2010 1:48 pm Subject: Re: [cf-satellite] Initial draft of a C-RDR structure for NPP VIIRS data > Hi Jim... > > Regarding John Bates' note (below) and your post to the cf-satellite > list, I wanted to express our interest in this work. As you may be > aware, we have been working with the simulated JPSS data to help > refine it's form. And, of course, we are working through this > cf-satellite email list to define a starting CF convention for > satellite data as part of our GOES-R work (it is moving along, but > slowly), to provide a baseline for data providers and application > developers so that little new code has to be written every time some > new satellite data is made available. > > With regard to your and John's notes, though, we don't really know the > context and thus several questions come to mind: is NOAA going to > coordinate among their data providers to create one "standard format" > for these data? Or will there be another step in the process (for > example, logically combining files via NCML)? > > We also wonder if John's note, and your work, are related to what we > are already engaged in doing with the simulated data? It is our > understanding that this form would be very close to what will be > available to users. Is that still the case, or is this a separate > effort? > > And....is this related to CLASS and/or GRAVITE? > > Let me also comment on the NCML example you posted -- I am very > disturbed by the use of "groups" -- even worse, nested groups. While > this is certainly part of HDF5 and the NetCDF-4 "Model", using nested > groups makes it extremely difficult to write generic applications that > will be able to simply open a NetCDF file, gather all the variables > and then attempt to make sense of them. It also makes it difficult to > even inspect the data. If at all possible, I beg you to reconsider > this since it will result in people having to write a lot of code > specific to these data, just to paw their way through the > forest....instead of just having a "getVariables()" call.... > > Let me add that the key to the cf-satellite convention effort is to > lock in a basic form of the data that can be added to for specific > needs (for example, adding "engineering data"), so that applications > have a chance of understanding the basic structure and could, perhaps, > present a sensible list of choices of parameters to a user....or just > "know" what to do. > > Finally (for John?) -- Are we talking only about C-RDR level0 or > L1B or both? > > Thanks ahead....and definitely count us "in"..... > > Best wishes, > > tom > Tom Rink > Tommy Jasmin > > --------------- Original Message from John Bates ----------------- > From: "John J. Bates" <John.J.Bates@xxxxxxxx> > Date: July 19, 2010 12:59:51 PM CDT > To: <itsc17@xxxxxxxxxxxxx> > Subject: VIIRS Climate-RDR reveiw > > Dear Colleagues, at ITSC-17 I mentioned that we have an effort to > translate the original form of the NPP-JPSS raw data record (RDR) > format into something more user friendly that would also contain all > information needed to process into calibrated, navigated radiance > data. We are now at the point where we are considering the specifics > of how to write out the data (already decided NetCDF 4 CF-compliant) > and wish to get you input as you are potential users. > > Those who would like to participate in getting information and > providing feedback, please contact Jim Biard (Jim.Biard@xxxxxxxx) for > more information. We will be doing the VIIRS data first, but will be > doing all sensors on NPP eventually. > > Regards, John > > ----------------------------end---------------------------- > > -- > Tom Whittaker > University of Wisconsin-Madison > Space Science & Engineering Center (SSEC) > Cooperative Institute for Meteorological Satellite Studies (CIMSS) > 1225 W. Dayton Street > Madison, WI 53706 USA > ph: +1 608 262 2759 >
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