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Hi Tom,Definitely a telecon sounds worthwhile. Until then I can provide some of the basics of what we are doing.
Realizing the NPP Raw Data Records (RDR) were created more for deep archive, not reprocessing, we are creating raw L0 data files for easy and efficient access. We are calling these 'products' Climate RDRs. The Climate RDR contains raw measurements that are uncompressed and extracted from their CCSDS packets. The Climate RDR is not calibrated or geolocated but the calibration and geolocation coefficients are stored in a companion file. Both the Climate RDRs and processing coefficients will be archived and available through
the NOAA Archives (CLASS). Drew Drew Saunders Climate RDR Project Lead STG, Inc., Government Contractor Remote Sensing and Applications Division (RSAD) National Climatic Data Center 151 Patton Ave. Asheville, NC 28801-5001 (828) 271-4268 Tom Whittaker wrote:
Hi John.... Probably have to be the week after next -- Tom Rink & Tommy Jasmin (and others) will be at a conference next week. Let's touch base when they return. tom On Tue, Jul 20, 2010 at 3:43 PM, <John.J.Bates@xxxxxxxx> wrote: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 dataHi 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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