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Revision as of 12:14, October 1, 2007 by Erin Robinson (ERobinson) (talk | contribs) (gridding options in DataFed? -- ~~~~)

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AirNOW time zones -- KBenedict May 10, 2007[edit source | reply | new]

In the AirNOW dataset that is accessible through DataFed, what is the time zone for the stations data?

Re: AirNOW time zones -- Rhusar May 11, 2007 12:14 PM[edit source | reply | new]

Hey Sean, I know Tim may be out roaming the world, so I need a small favor. Would you check with the AirNow cast in your office what is the time zone on the OBS files that we are accessing for the Airnow data. We need to fix the DataFed WCS service so the times are properly encoded with the time zone for each station. Thanks in advance,

Re: Re: AirNOW time zones -- SRaffuse May 11, 2007 12:30 PM[edit source | reply | new]

Rudy, According to the AIRNow folks here, the time zone depends on the OBS file and is specified in the header (TZONE). The example you linked below is in EDT.

Re: Re: Re: AirNOW time zones -- Rhusar May 11, 2007 12:54 PM[edit source | reply | new]

Ok, is the TZone for a station changing with time or is it the same for a specific station?

Re: Re: Re: Re: AirNOW time zones -- SRaffuse May 11, 2007 12:58 PM[edit source | reply | new]

I believe that it can change with time at the whim of the agency delivering the data. For example, they may switch to and from daylight savings time. I have cc’d the AIRNow data management center folks and they can correct me if I am incorrect.

Re: Re: Re: Re: AirNOW time zones -- KBenedict May 11, 2007 1:31 PM[edit source | reply | new]

Quite impressive instant gratification. I'm amazed. Is there anything we can do to help at this point? I'm not sure that normalization to UTC is absolutely required (though probably useful). As long as the UTC offsets are included in the timestamps, probably using the ISO standard, that should provide sufficient data for retrieval using unambiguous time specifications. That being said, a question ... How does the OGC WMS/WCS time specification support Time Zone elements in time parameter requests? It seems that this is a likely area of potential confusion in different implementations of the OGC specifications. Just thinking about some of the implementation variations that you mentioned yesterday...

Why is my favorite AirNOW station missing? -- RPoriot 12:14, 15 June 2007 (CDT)[edit source | reply | new]

The Burlington, VT site has been monitoring PM2.5, but the data for that site are not accessible through the DataFed browser. Why?

Re: Why is my favorite AirNOW station missing? -- Rhusar 12:19, 15 June 2007 (CDT)[edit source | reply | new]

The AirNOW dataset accessible through the DataFed browser is delivered from a data cache that is maintained locally in the DataFed server. The cached version allows fast data access, spatial and temporal browsing and rapid data aggregation. The problem is that when a new station is added to the network, it does not immediately show up in the cached version since we don't automatically check for new sites. We recognize that this update anomaly should be remedied in the future.

gridding options in DataFed? -- Erin Robinson (ERobinson) 14:14, 1 October 2007 (EDT)[edit source | reply | new]

I am back to work, so I've started to look into some things we've discussed. On PM2.5 gridding - still can't see any options under WCS or any other services associated with this product. Can you please point me to the right page? Cheers, -Greg