HI John, I have been tasked with maintaining the HF Radar national network THREDDS server here at SIO. Rich has helped us set things up, and has been a valuable resource for learning this system. We have been having a frequent problem that Rich has been unable to help us with, which is occasional bad timestamps and occasional bad data served through THREDDS. An example of bad data being served through THREDDS: we are working with ASA& USCG to get data into their SAROPS product. They have complained that many of the data samples have had data in the wrong geographical location (ie ocean currents over land). I have noticed this as well using the Godiva viewer, and when I compare the Godiva map with the source netcdf file, it is not plotting the data in the correct location. This makes me think it is a problem with the data being served by THREDDS. The problem goes away after some time, as we typically update the netcdf files multiple times over 5-6 hours after they are created. I'm not sure if the updating of the netcdf files is the cause of the problem, but it is not something that is easy to reproduce.
The problem we have with weird timestamps happens occasionally, and in random locations throughout the time index. It usually is just one sample here or there, and not successive samples. It almost always goes away when I empty the cache.
I'm not sure if these issues are setup related, or issues we can script some workarounds to help. But I wanted to check with you to see if you have any idea of what is going on.
Thanks for your time,
Tom Cook Programmer/Analyst Coastal Observation Research& Development Center Scripps Institution of Oceanography
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