From: dsc@gemini.tmc.edu (Doug S. Caprette Bldg. 28 W191 x3892)
Subject: Re: NASA crustal dynamics proj
Organization: NASA GSFC DOSE VLBI
Date: Tue, 10 Nov 1992 15:47:45 GMT

In article <1992Nov10.040604.24879@bert.eecs.uic.edu> rorem@bert.eecs.uic.edu (Doug Rorem) writes:
>Hi,
>
> I hope this is the right newsgroup...  I am trying to find out
>information about the NASA Crustal Dynamics Project (CDP). I saw references
>to this in a GPS (Global Positioning System) bulletin where
>XY positions for reference stations were listed using the NASA CDP
>coordinates.  Is this a world-wide or USA only XY coordinate scheme?
>Is it based on some type of map projection?  Thanks for any answers..
>(email or post, depending on your judgement)
>
>Doug Rorem
>University of Illinois at Chicago
>rorem@bert.eecs.uic.edu

The NASA Crustal Dynamics Project (CDP) has expired.  Projects are of a 
temporary nature at NASA.   However, the project has been succeeded by the 
Dynamics of Solid Earth (DOSE) which is something of a more permanent nature,
though in practice with limited funding it may not last as long as did the 
CDP!  We don't like the acronym DOSE, so the name is hopefully being changed
to the NASA Space Geodesy Program.

I worked in the Very Long Baseline Interferometry (VLBI) group of the CDP, and 
now work in the VLBI group of DOSE, and will work in the VLBI group of the NASA
Space Geodesy program.  We are at the NASA Goddard Space Flight Center in
Greenbelt, Maryland.  There is also a Satellite Laser Ranging Group (SLR), and
people do GPS both here and at JPL.  Much of the VLBI data is gathered by or in
cooperation with the National Geodetic Survey (NGS), United States Naval 
Observatory (USNO), Naval Research Laboratory (NRL), and foreign agencies.  The
National Radio Observatory (NRAO) Very Long Baseline Array (VLBA) may soon be
a major contributor of geodetic VLBI data.  Yes, we just love acronyms here at
NASA!

Roughly twice a year the VLBI group releases a set of 3D global geocentric
Cartesian coordinates for approximately 40 fixed stations and 70 mobile sites 
worldwide.  The mobile sites are concentrated in the Western US, and Southern
Alaska.  These however, are no longer visited by VLBI on a regular basis.  Some
of the permanent stations (radio telescopes) are also no longer in existence.
E.G. Hurricane Andrew destroyed the Richmond, Florida Antenna.  Fortunately,
our station at Kauai survived Iniki with minimal damage.  Other available 
results include station velocities, radio source positions, earth orientation,
nutation, and precession offsets, and baseline results.

These results are available by anonymous ftp from:

cddis@gsfc.nasa.gov

The 1992 VLBI results, covering data obtained through the end of 1991, will
be posted to cddis this week, perhaps today, when I get done reading news.
SLR results, and probably GPS results are also available there.
--
dsc@gemini.gsfc.nasa.gov  
 |  Regards,         |   Hughes STX                |    Code 926.9 GSFC        |
 |  Doug Caprette    |   Lanham, Maryland          |    Greenbelt, MD  20771   |
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