This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Timothy, Thanks for the information in the previous email.Working with the new NDFD data, I noticed that the given End time intervals were not consistent with other NCEP type models.
I was wondering why the NDFD data uses the start of interval as the given End of Interval using Octets 35-41 in PDS 4.8? It would of made more sense to me to use the End of Interval as it's calculated from the time
ranges. Here's an example: productType 8 Reference Time Wed May 12 15:00:00 MDT 2010 End of Interval from time ranges Mon May 17 06:00:00 MDT 2010 End of Time Interval from octets 35-41 Sun May 16 06:00:00 MDT 2010 Interval Start Stop =87 111 RT = May 12 15:00:00 End of Time Interval from octets 35-41 = RT + 87 hours End of Interval from time ranges = RT + 111Almost all other NCEP models use the End of Interval from time ranges as the given End of Interval in Octets 35-41
Thanks, RObb... =============================================================================== Robb Kambic Unidata Program Center Software Engineer III Univ. Corp for Atmospheric Research address@hidden WWW: http://www.unidata.ucar.edu/ ===============================================================================