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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 >> >> >> _______________________________________________ >> ldm-users mailing listldm-users@xxxxxxxxxxxxxxxx >> For list information or to unsubscribe, visit: >> http://www.unidata.ucar.edu/mailing_lists/ >> >> >> >> _______________________________________________ >> ldm-users mailing list >> ldm-users@xxxxxxxxxxxxxxxx >> For list information or to unsubscribe, visit: >> http://www.unidata.ucar.edu/mailing_lists/ >> > > -- ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ ∙ Blair Trosper Updraft Networks / Weather Data NOC: 469-844-5440 Early Watch Notifications: http://twitter.com/weatherwatches
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