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Re: 20011126: CONDUIT/ECMWF data for European Center for Geodynamicsand Seismology

Hi Tonie, 

I have checked the route to your machine from here, and it does not get to
green.ecgs.lu in a very timely manner, It is so slow, I am not confident
that the passing of large products (i.e. CONDUIT model output) will be
feasible. I am also not aware of what restrictions for re-distribution of
ECMWF within Europe may exist, but I believe it may be an issue (the data
is propriatary)

Below are the results of a traceroute from UCAR to your location, the hops
after 17 I suspect are internal, and behind a firewall, as they do not
resolve. Perhaps if green.ecgs was closer to the firewall it may create a
difference in trace time. The time to router.ecgs.lu (158.64.9.1) is
feasible...

(jweber) laraine:/home/jweber 46 % traceroute green.ecgs.lu
traceroute to green.ecgs.lu (158.64.9.20), 30 hops max, 40 byte packets
 1  flra-n140 (128.117.140.252)  1 ms  0 ms  0 ms
 2  vbnsr-n2.ucar.edu (128.117.2.252)  1 ms  1 ms  1 ms
 3  internetr-n243-104.ucar.edu (128.117.243.106)  1 ms  2 ms  1 ms
 4  denv-abilene.ucar.edu (128.117.243.126)  2 ms  2 ms  2 ms
 5  kscy-dnvr.abilene.ucaid.edu (198.32.8.14)  13 ms  13 ms  13 ms
 6  ipls-kscy.abilene.ucaid.edu (198.32.8.6)  22 ms  22 ms  22 ms
 7  clev-ipls.abilene.ucaid.edu (198.32.8.26)  28 ms  28 ms  49 ms
 8  nycm-clev.abilene.ucaid.edu (198.32.8.30)  41 ms  41 ms  40 ms
 9  abilene-stm4.ny4.ny.dante.net (212.1.200.153)  40 ms  41 ms  41 ms
10  212.1.201.35 (212.1.201.35)  41 ms  41 ms  40 ms
11  restena-dws.de1.de.geant.net (62.40.105.141)  157 ms  157 ms  157 ms
12  de.nl1.nl.geant.net (62.40.96.54)  163 ms  164 ms  164 ms
13  nl.be1.be.geant.net (62.40.96.21)  167 ms  167 ms  167 ms
14  be.lu1.lu.geant.net (62.40.96.26)  171 ms  171 ms  170 ms
15  restena-gw.lu1.lu.geant.net (62.40.103.94)  170 ms  171 ms  170 ms
16  POP-RESTENA-ge400-25-v25.restena.lu (158.64.16.214)  171 ms  171 ms
170 ms
17  router.ecgs.lu (158.64.9.1)  180 ms  180 ms  180 ms
18  * * *
19  * * *
20  * * *
21  * * *
22  * * *
23  * * *
24  * * *
25  * * *
26  * * *
27  * * *
28  * * *
29  * * *
30  * * *
(jweber) laraine:/home/jweber 47 % 


Thank you,

-Jeff
____________________________                  _____________________
Jeff Weber                                    address@hidden
Unidata Support                               PH:303-497-8676 
NWS-COMET Case Study Library                  FX:303-497-8690
University Corp for Atmospheric Research      3300 Mitchell Ln
http://www.unidata.ucar.edu/staff/jweber      Boulder,Co 80307-3000
________________________________________      ______________________

On Fri, 30 Nov 2001, Tonie van Dam wrote:

> dear jeff,
> thanks for getting back in touch with me. i really appreciate it.
> the fully qualified domain name of your machine:
> green.ecgs.lu
> 
> i have worked with ldm before but not in a near real time mode.
> thanks for the links to the software and packages. and i'll also 
> try to figure out what is the name of the ncep files i'll need to
> download. this is really confusing for me. i'm used to the reanalysis
> data and the naming of those files. i don't know what the equivalent 
> operational files are called.
> 
> and thanks for the suominet information. i was actually on the
> unavco steering committee for a while. and so i am very familiar with
> the suominet project.
> 
> thanks again for your help.
> ---tonie
> 
> Jeff Weber wrote:
> > 
> > Hello Tonie,
> > 
> > Your research sounds quite exciting, I hope we can help in some way.
> > I also worked with pressure fields, modelled vs. measured over Greenland
> > (atmos applications not geodetic, but pressure is pressure)
> > 
> > >From your question,
> > 
> > 2) what is the minimal grid spacing available?
> > 
> > I am assuming you are interested in the highest resolution possible.
> > 
> > There are some logistical and bureaucratic issues we need to investigate
> > before we proceed any further..i.e WMO resolution 40, and connectivity via
> > the internet to your institution to determine if this is a viable method
> > for data transfer.
> > 
> > Please see:
> > 
> > http://unidata.ucar.edu/data/data_usage.html
> > 
> > and
> > 
> > http://205.156.54.206/im/wmocovr.htm
> > 
> > regarding data usage.
> > 
> > To start, could you please provide me with the fully qualified domain name
> > of your machine that you hope to be ingesting the data, this way I can
> > analyze routings and possible latencies to your location.
> > 
> >  3) who should i talk to about getting the data and the software for
> > >    unpacking the data? i already use grib on the historical data that i
> > >    have.
> > > 3) is this data set available in near real time.
> > >
> > 
> > Please see:
> > 
> > http://unidata.ucar.edu/Software.html
> > 
> > and in particular:
> > 
> > http://unidata.ucar.edu/packages/ldm/index.html
> > 
> > for data access, and:
> > 
> > http://unidata.ucar.edu/data/exp.models.html
> > 
> > for more info regarding the high resolution (CONDUIT) model feed.
> > 
> > I hope this answers some of your questions, and hopefully we can help you
> > with data access for your research.
> > 
> > As an aside, you may also be interested in the SuomiNet project, deriving
> > water vapor profiles from the delay in GPS signals.
> > 
> > http://www.unidata.ucar.edu/suominet/
> > 
> > <snip>
> > > ------- Forwarded Message
> > >
> > > >To: address@hidden
> > > >From: Tonie van Dam <address@hidden>
> > > >Subject: (no subject)
> > > >Organization: ecgs
> > > >Keywords: 200111261645.fAQGjtN00538
> > >
> > > dear sir or madame,
> > >
> > > i'm a little lost and i'm hoping that you can help me figure out where
> > > to go to get what i need. i do research in geophysics. in particular,
> > > i've spent a great deal of time looking at the problem of the loading
> > > of atmospheric pressure on the earth's surface. as our geodetic
> > > techniques improve, this signal is becoming more and more problematic
> > > in the data.  and we would like to be able to remove it from our GPs
> > > and gravity coordinate time series.
> > >
> > > there is a growing demand from our community that we establish a
> > > service that estimates these errors. i'm writing the proposal now.  the
> > > requirements are such that near real time estimates are becoming
> > > necessary.  specifically what we need are the 6 hourly global pressure
> > > grids (surface and upper air) in near real time. i've looked all over
> > > the unidata web page and i can't find any information on this.  we are
> > > willing to subscribe to the service if necessary. but first i'd like to
> > > plead my case that we are a scientific research institute
> > > (collaborating heavily with scientists in the u.s.) and that the data
> > > will only be used for scientific research purposes only. we further
> > > agree not to distribute the data to anyone. we will only use it to
> > > compute the deformation of the earth's crust and this is what will be
> > > distributed.
> > >
> > > can you please tell
> > >
> > > 1) is it possible to get the NMC/NCEP 6 hourly global grids in near real
> > >    time
> > > 2) what is the minimal grid spacing available?
> > >
> > > 3) who should i talk to about getting the data and the software for
> > >    unpacking the data? i already use grib on the historical data that i
> > >    have.
> > > 3) is this data set available in near real time.
> > >
> > > any help you can provide would be greatly and sincerely appreciated.
> > >
> > > thank you,
> > >
> > > ---tonie
> > > --
> > > Dr. Tonie van Dam
> > > European Center for Geodynamics and Seismology
> > > 19 Rue Josy Welter
> > > L-7256 Walferdange
> > > Luxembourg
> > > address@hidden
> > > office: 35-2-33-61-27
> > > fax: 35-2-33-61-29
> > >
> > >
> > <snip>
> > 
> > Thank you,
> > 
> > -Jeff
> > ____________________________                  _____________________
> > Jeff Weber                                    address@hidden
> > Unidata Support                               PH:303-497-8676
> > NWS-COMET Case Study Library                  FX:303-497-8690
> > University Corp for Atmospheric Research      3300 Mitchell Ln
> > http://www.unidata.ucar.edu/staff/jweber      Boulder,Co 80307-3000
> > ________________________________________      ______________________
> 
> -- 
> Dr. Tonie van Dam
> European Center for Geodynamics and Seismology
> 19 Rue Josy Welter
> L-7256 Walferdange
> Luxembourg
> address@hidden
> office: 35-2-33-61-27
> fax: 35-2-33-61-29
>