[gradsusr] Extract european Metars from monsoondata.org:9090 and plot them

Tue Feb 16 10:17:55 EST 2016

Hi, Amelia —
We get the raw metars through the LDM (http://www.unidata.ucar.edu/software/ldm/). There are reports from LIEE (Cagliari), but in the file I checked (12z16Feb2016) their time stamp is late, at 20 minutes past the hour or 12:20z The code we use to decode the metars expects the time stamp for a 12z observation to be between 11:49z and 12:06z. Anything outside that range is not included in our decoded obs. The weather observers in Sardinia are just a bit too relaxed! :-)

If you can get a hold of the raw metars and want to try re-processing them with more generous time stamp constraints, Brian Doty's C programs for decoding the obs are posted at ftp://cola.gmu.edu/pub/jma/metar_decoding/.  The code is free, but we can’t provide any support for using it.

—Jennifer

On Feb 16, 2016, at 3:09 AM, amelia graziano <ameliagraziano at TISCALINET.IT<mailto:ameliagraziano at TISCALINET.IT>> wrote:

Jennifer,

Everything is working fine. There is just one problem, a lot of reports are missing. E.g. no reports at all from Sardinia, Italy

Is this a problem due to the source of METARs http://monsoondata.org:9090/dods/stn/metar or somenthing else?

Thanks again! Amelia

At 20:55 15/02/2016, you wrote:
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Amelia,
Simply change the date you want to display with the ‘set time’ command:
‘set time 18z15feb’
‘d ts’
—Jennifer

On Feb 15, 2016, at 2:04 PM, amelia graziano < ameliagraziano at TISCALINET.IT<mailto:ameliagraziano at TISCALINET.IT>> wrote:

Jennifer thanks for the quick answer.

It works, but for what I understand, the METARs plotted are the reports for Feb 1st,. What I have to change for have plotted the latest MATARs (Feb 15th 1800UTC ?

Amelia

At 16:08 15/02/2016, you wrote:
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Hi, Amelia —
Always use ‘open’ with GDS station data URLs.

Once you’ve got the data set open, you can’t explicitly set which stations will get plotted on a lat/lon map. The only option is to use the ‘filt’ variable to control the density of stations in the domain.

'open http://monsoondata.org:9090/dods/stn/metar/2016/mon02'
‘set lon 6 20’
‘set lat 36 48’
‘set stid on’
‘set digsiz 0.15’
‘set gxout stnmark’
‘d ts’

You will see a map that shows all the stations reporting surface temperature with the stationID printed below the colored marks. you can use ‘filt’ to thin out the reports, e.g.

'd maskout(ts,4-filt)’

This will show fewer reports. To see what the ‘filt' value is for each station,

‘set gxout value’
‘set digsiz 0.1'
‘d filt’

If you also ‘set stnprint on’ and ‘set stat on’, GrADS will print the stationID, lon, lat, lev, and value to the terminal (or to the ‘result’ variable if you are running in a script).

—Jennifer

On Feb 14, 2016, at 2:56 PM, amelia graziano < ameliagraziano at TISCALINET.IT<mailto:ameliagraziano at TISCALINET.IT>> wrote:

Hello everybody,

I have a question! I know under
http://monsoondata.org:9090/dods/stn/metar/2016/mon02 there are all
the February Metars , my goal is to extract some Metar Airports at
specific time and plot them on a map.

I don't kow how to procede. I tried open
http://monsoondata.org:9090/dods/stn/metar/2016/mon02 or sdfopen
http://monsoondata.org:9090/dods/stn/metar/2016/mon02

But no luck!

Thanks in advance for help

Amelia Graziano

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--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University

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--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University

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--
Jennifer Miletta Adams
Center for Ocean-Land-Atmosphere Studies (COLA)
George Mason University

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