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?
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Blair Trosper
Updraft Networks / Weather Data
NOC: 469-844-5440
Early Watch Notifications: http://twitter.com/weatherwatches
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