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20010413: AMDAR data on NOAAPORT

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: 20010413: AMDAR data on NOAAPORT
  • Date: Fri, 13 Apr 2001 11:23:38 -0600
Celia,

GEMPAK decodes the in-situ aircraft observations (including AMDARS) from
the NWSTG NOAAPORT data stream using the dcacft decoder. The data is decoded
into a ship format GEMPAK file. The LDM pattern action from the GEMPAK decoders
web page examples looks like:

# Decoder for Aircraft Observations
WMO     (^U[ABDR].... ....|^XRXX84 KAWN|^YIXX84 KAWN) ([0-3][0-9])([0-2][0-9])
        PIPE    dcacft data/gempak/acft/YYYYMMDDHH_acf.gem


In regards to the FSL NetCDF data stream, you will find that every 10 minutes,
FSL sends all observations collected over the previous hour. As a result, the
FSL files contain a 1 hour window of data, with duplication of observations
sent in the previous 5 data files as well as new data which they processed
since the previous file was transmitted.


Steve Chiswell
Unidata User Support




On Fri, 13 Apr 2001, Linda Miller wrote:

> Chiz,
> 
> Here's the one from yesterday.  See any similarities?
> 
> Linda
> 
> ---------- Forwarded Message ----------
> Date: Thursday, April 12, 2001 3:39 PM -0600
> From: Unidata Support <address@hidden>
> To: Celia Chen <address@hidden>
> Subject: 20010412: netcdf-to-wmo format utility
> 
> >From: Celia Chen <address@hidden>
> >Organization: NCAR/RAP
> >Keywords: 200104112303.f3BN34L23087 encoder
> 
> Hi Celia-
> 
> >I am pretty sure what I need is the WMO FM42 format.  I have been receiving
> >the AMDAR data from FSL via the LDM.  The files are in netCDF format
> >and we would like to see if we can convert them into (back to?) the
> >WMO FM42 format.
> 
> We have nothing like that.  I would think it would be easier to write
> a decoder to take the netCDF data to whatever format your FM42 decoder
> puts out, rather than encoding and running it through a separate decoder.
> 
> >I just learned that we get the AMDAR data as a WMO product.  Do you
> >happen to know if the data we receive from FSL is the same?  I do
> >notice that the FSL data is about 2 hrs late.
> 
> We were not aware that the AMDAR data are available as a WMO product.
> these products on the NOAAPort feed?
> 
> As to the delay, we know there is some processing occurring at FSL and
> you may be seeing some latency due to that process.  Can you give an
> example of a late product?
> 
> Also, are you saying that the WMO AMDARs are 2 hours ahead of the FSL data,
> or just that the FSL data is late.  If the latter, are the WMO AMDARs
> on time?
> 
> I'm cc'ing this to Linda Miller who has been our contact with FSL on
> the ACARS and AMDAR data.
> 
> Don Murray
> 
> ---------- End Forwarded Message ----------
> 
> 
> 
> Linda Miller - address@hidden
> External Liaison, Unidata
> University Corporation for Atmospheric Research
> P.O. Box 3000
> Boulder, CO 80307-3000
> 303 497-8646 fax: 303-497-8690
> URL:  http://www.unidata.ucar.edu/staff/lmiller/un.act.html
> 
>