[IGSMAIL-5597]: New troposphere product available

[Carey Noll]

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IGS Electronic Mail      25 Apr 12:02:39 PDT 2007      Message Number 5597
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Author: Sung Byun/JPL

Dear Colleagues:

We have added a new set of IGS troposphere products, a comparison  
between the new IGS trop product and each AC's submitted products by  
ground station. Each ground station has one file per year. The file  
content is a simple time series of troposphere comparison results.  
The file looks like this:

# cal_tm    gps_tm  AC   bias(mm) sdev(mm)
2006-12-26  14072   eur  -2.7     4.0
2006-12-27  14073   eur  -2.9     4.3
2006-12-27  14073   jpl   6.1     6.6
2006-12-28  14074   eur  -1.2     1.9

The first column is calendar time, the second is GPS time, and the  
third is the AC. The fourth and the fifth columns are the daily bias  
and the standard deviation WRT the new IGS trop product in that  
order. We also provide the station-based comparison plot for the  
entire comparison time series.

There are now quite a few troposphere related products comprising  
both the new and legacy procedure. So it would be more appropriate to  
improve the organization of these products. At the CDDIS the IGS  
troposphere product files are archived with the following directory  
structure.

ftp://cddis.gsfc.nasa.gov/pub/gps/products/troposphere/cmp  
(comparison of new and AC submitted product)
                              /gps/products/troposphere/new (new  
product)
                              /gps/products/troposphere/old (legacy  
product, including NRT files)
                              /gps/products/troposphere/rpt (reports)
                              /gps/products/troposphere/sta (ground  
station comparison files)
                              /gps/products/troposphere/sub  
(troposphere AC submission files)

The previous directory structure will remain online for the near  
future using links to the new directory structure.

Best,
Sung
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Ms. Carey Noll
Manager, Crustal Dynamics Data Information System (CDDIS)
Secretary, ILRS Central Bureau
NASA GSFC
Code 690.5
Greenbelt, MD 20771
USA

E-mail:  Carey.Noll at nasa.gov
Voice: (301) 614-6542
Fax: (301) 614-6015
WWW:  http://cddis.gsfc.nasa.gov