Many thanks for the input and ideas. I think I have what I need to start
having a go at this in a slightly more efficient way.
On Mon, Apr 28, 2014 at 9:26 AM, Alan Hall - NOAA Federal <
alan.hall@xxxxxxxx> wrote:
> You just need to know the first VCP in the file as Joe suggests, a
> compromise, but still very timely in that the next scan will shoe the new
> vcp.
>
> At NCDC we do not currently harvest this data, but we are working on the
> possibility, so I would be very interested in this code.
>
> *-Alan*
>
> ------
>
> Alan D. Hall
> IT Project Manager
> Remote Sensing and Applications Division (RSAD)
> National Climatic Data Center
> 151 Patton Ave.
> Asheville, NC 28801-5001
> Alan.Hall@xxxxxxxx(828)271-4071
>
> Follow NCDC on Facebook
> <http://www.facebook.com/NOAANationalClimaticDataCenter> and Twitter
> <http://www.twitter.com/NOAANCDC> (@NOAANCDC)
>
>
>
> On Sat, Apr 26, 2014 at 6:23 PM, Joe Sirott <sirott@xxxxxxxxxx> wrote:
>
>> Hi Blair,
>>
>> You don't have to read the entire file do get the first VCP in the file
>> -- just the first bzipped record. We have code that does this and it takes
>> very little time per station.
>>
>>
>> On 4/26/14 1:26 PM, Blair Trosper wrote:
>>
>> Some of you may recall a past thread similar to this, and I'm sort of
>> looking for ideas -- so if anyone has something better than what I
>> describe, I would love to know.
>>
>> We've got a service, which we're about to open up to the world for
>> free, that notifies a subscriber via SMS when a RADAR site goes from 31/32
>> into an "active" mode (you can choose the granularity of which VCPs you'd
>> want notifications for, just in case you didn't care about VCP 121, for
>> example). It's a very good 'heads up' that things are about to become
>> eventful. (The service can also send emails, push the data to a URL
>> endpoint, and even push it to apps.)
>>
>> To that end, we keep track of the metadata (VCP, timestamp, etc) from
>> all the volume scans we ingest. At present, this requires us to use custom
>> C++ code to actually decipher the L2 or L3 scans to locate the data. While
>> this generally works, the problem in this method is two fold:
>> - About 10% of the scans do not conform to the storage structure outlined
>> by the ROC, requiring us to write more kludges than I'd care to admit.
>> (ROC hasn't bothered to return communications regarding bugs we've
>> reported in this regard.)
>> - This is computationally expensive. (We're doing more than just pulling
>> the metadata, such as plotting the smoothed data over Google Maps, but you
>> can imagine than reading the entire L2 file just to find out the VCP is
>> inefficient.)
>>
>> I've always wished there was a free text message type product on
>> IDS/HDS that would send the metadata along with each volume scan, but that
>> doesn't seem to exist. (We've requested it, but apparently the demand for
>> this is low.)
>>
>> The closest thing I can find is something similar to this product:
>> http://www.rwic.und.edu/weather/text/KMAF/SDUS84.wmo
>>
>> Its NNN is DPA and follows the WMO ID pattern of SDUS##...however, it's
>> only sent out hourly.
>>
>> Can anyone think of a better way...or perhaps even point out a product
>> I'm perhaps not aware of?
>>
>> ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙
>> ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙
>> Blair Trosper
>> Updraft Networks / Weather Data
>> NOC: 469-844-5440
>> Early Watch Notifications: http://twitter.com/weatherwatches
>>
>>
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>
--
∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙
∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙
Blair Trosper
Updraft Networks / Weather Data
NOC: 469-844-5440
Early Watch Notifications: http://twitter.com/weatherwatches
