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GPS Data Sets

The ftp archive of GPS data and products on the CDDIS has the following structure. The values listed in red are substitution codes within the directories and filenames defined in Table 2 below. Many GPS data and product files archived at the CDDIS are stored in UNIX compress format and end in a .Z. Software to uncompress these files can be found at http://www.gzip.org.

This information on the GPS ftp structure at the CDDIS is divided into several tables:

  • Table 1: Overview of the ftp structure for GPS data and products
  • Table 2: Detailed diagram of the directory structure for GPS data
  • Table 3: Detailed diagram of the directory structure for GPS products
  • Table 4: Substitution codes for directories and filenames
  • Table 5: Examples

Table 1. Overview of CDDIS FTP Structure for GPS Data and Products

/pub /data /campaign /location /yyyy      
/daily /yyyy /ddd /yyt monuddd#.yyt.Z  
/highrate /yyyy /ddd /yyt /hh monudddhmi.yyt.Z
/hourly /yyyy /ddd /hh monuddd#.yyt.Z  
/satellite /satname /yyyy /ddd satcddd#.yyt.Z  
/products igs00p02.erp.Z          
igs95p02.erp.Z          
igs96p02.erp.Z          
/wwww cenwwwwd.typ.Z
igrwwwwd.typ.Z
IGSyyPww.typ.Z
igsyyPwwww.typ.Z
iguwwwwd_hr.typ.Z		        
/trop monuwwww.zpd.Z      
/ionex /yyyy /ddd cengddd0.yyi.Z    
    /topex cengddd0.yyi.Z
jpltpx_yymmdd.dat.Z		  
    /valid cenwwwww.yyv.Z  
/latest /final cenwwwwd.typ.Z      
/rapid igrwwwwd.typ.Z      
/ultra iguwwwwd_hr.typ.Z      
/leopp /champ /center      
/jason /center      
/tools        
/trop /wwww monuwwww.zpd.Z      
/yyyy CONTENT_yyyy_mm.Z
zpd_yyyy_mm.tar.Z		      
/nrt /wwww TROPSUM_wwwwd.ovw.Z
TROP_wwwwd_hh.ovw.Z
igs60_wwwwd_hh.ovw.Z		    
/trop_new /yyyy /ddd monuddd0.yyzpd.gz  
MORE            

Table 2. CDDIS FTP Structure for GPS Data

/pub
/gps
MORE
/data
/products
/campaign
/daily
/highrate
/hourly
/satellite
/location
/yyyy
/yyyy
/yyyy
/satname
/yyyy
/ddd
/ddd
/ddd
/yyyy
/yyd
/yyg
/yym
/yyn
/yyo
/yys
/yyd
/yym
/yyn
/hh
/ddd
monuddd#.yyt.Z
/hh
/hh
/hh
monuddd#.yyt.Z
satcddd#.yyt.Z
 
monudddhmi.yyt.Z
  

GPS campaign data
Daily files of 30-second GPS data
15-minute files of 1-second GPS data
Hourly files of 30-second GPS data
Daily files of LEO GPS satellite data
GPS product files
Other data

Table 3. CDDIS FTP Structure for GPS Products

/pub
/gps
 MORE
/data
/products
  
 
/wwww
/ionex
/latest
/trop
/trop_new
  
  cenwwwwd.typ.Z
igrwwwwd.typ.Z
IGSyyPww.typ.Z
igsyyPwwww.typ.Z
iguwwwwd_hr.typ.Z
/trop
/ddd
/final
/rapid
/ultra
/wwww
/yyyy
/nrt
/yyyy
  
 
monuwwww.zpd.Z
cengddd0.yyi.Z
 /topex /valid
cenwwwwd.typ.Z
igrwwwwd.typ.Z
iguwwwwd_hr.typ.Z
monuwwww.zpd.Z
CONTENT_yyyy_mm.Z
zpd_yyyy_mm.tar.Z
/wwww
/ddd
  
      cengddd0.yyi.Z
jpltpx_yymmdd.dat.Z		 cenwwwww.yyv.Z
TROPSUM_wwwwd.ovw.Z
TROP_wwwwd_hh.ovw.Z
igs60_wwwwd_hh.ovw.Z
monuddd0.yyzpd.gz
  
GPS data Weekly GPS product files Weekly GPS troposphere solutions by site Daily IONEX product files Daily TOPEX ionosphere validation files Weekly ionosphere validation files Most recent IGS product files Most recent IGS rapid product files Most recent IGS ultra-rapid product files Weekly GPS troposphere solutions by site Monthly GPS troposphere solutions Near real-time sub-daily troposphere solutions Daily troposphere solutions (new format) Other data
 

Table 4. Substitution Codes for Directories and Filenames

Code Description Range Example
yyyy 4-digit year 1992-present 2005
yy 2-digit year 92-present 05
wwww 4-digit GPS week number 0649-present 1303
ww 2-digit week of year 01-52 01
ddd 3-digit day of year 001-366 001
dd 2-digit day of month 01-31 01
d 1-digit day of week 0-6, 7=full week 0
mm 2-digit month of year 01-12 01
hh 2-digit UTC hour of day 00-23 00
h 1-character UTC hour of day a-x (a=00, b=01, ..., x=23) a
hr 2-digit hour for ultra-rapid products 00, 06, 12, 18 00
mi 2-digit minute of hour 00, 15, 30, 45 00
t type of data file d=compact RINEX observation data
g=RINEX GLONASS navigation data
m=RINEX meteorological data
n=RINEX GPS navigation data
o=RINEX observation data
s=teqc summary file
d
typ type of product file clk=satellite clock solutions
cls=clock combination summary report
erp=Earth rotation parameters
res=residuals file
sp3=SP3 orbit format
sp3c=extended SP3 orbit format
snx=station positions in SINEX format
ssc=sets of station coordinates
sum=analysis summary report
sp3
# file sequence number (typically 0) 0-9 0
monu monument name Full list gode
cen analysis center Full list igs
satname satellite full name N/A champ
satc satellite code N/A cham
location campaign location Full list maui

Table 5. Examples

GPS Data Type Location of Example File in CDDIS ftp Archive
Daily 30-second compact RINEX observation data for GODE on 01/01/2005 ftp://cddis.gsfc.nasa.gov/pub/gps/data/daily/2005/001/05d/gode0010.05d.Z
15-minute 1-second compact RINEX observation data for GODE for UTC hour 0 on 01/01/2005 ftp://cddis.gsfc.nasa.gov/pub/gps/data/highrate/2005/001/05d/00/gode001a00.05d.Z
Hourly 30-second compact RINEX observation data for GODE for UTC hour 0 on 01/01/2005 ftp://cddis.gsfc.nasa.gov/pub/gps/data/hourly/2005/001/00/gode001a.05d.Z
Daily LEO satellite compact RINEX observation data for CHAMP on 01/01/2005 ftp://cddis.gsfc.nasa.gov/pub/gps/data/satellite/champ/2005/001/05d/cham0010.05d.Z
GPS Product Type Location of Example File in CDDIS ftp Archive
Weekly IGS final orbit file for day 6 of GPS week 1303 (01/01/2005) ftp://cddis.gsfc.nasa.gov/pub/gps/products/1303/igs13036.sp3.Z
Weekly IGS cumulative reference frame station positions for first week of 2005 ftp://cddis.gsfc.nasa.gov/pub/gps/products/1303/IGS05P01.snx.Z
Weekly IGS reference frame station positions for GPS week 1303 (12/26/2004-01/01/2005) ftp://cddis.gsfc.nasa.gov/pub/gps/products/1303/igs05P1303.snx.Z
IGS rapid orbit file for day 6 of GPS week 1303 (01/01/2005) ftp://cddis.gsfc.nasa.gov/pub/gps/products/1303/igu13036_00.sp3.Z
IGS ultra-rapid orbit file for UTC hour 0 of day 6 of GPS week 1303 (01/01/2005) ftp://cddis.gsfc.nasa.gov/pub/gps/products/1303/igr13036.sp3.Z
Accumulated IGS ERP estimates since 1995 for the IGS final products ftp://cddis.gsfc.nasa.gov/pub/gps/products/igs95p02.erp
Accumulated IGS ERP estimates since 1995 for the IGS rapid products ftp://cddis.gsfc.nasa.gov/pub/gps/products/igs96p02.erp
Accumulated IGS ERP estimates since 2000 for the IGS SINEX products ftp://cddis.gsfc.nasa.gov/pub/gps/products/igs00p02.erp
Weekly troposphere solution for GODE for GPS week 1303 ftp://cddis.gsfc.nasa.gov/pub/gps/products/1303/trop/gode1303.zpd.Z
ftp://cddis.gsfc.nasa.gov/pub/gps/products/trop/1303/gode1303.zpd.Z
Daily troposphere solution (new format) for GODE on 01/01/2005 ftp://cddis.gsfc.nasa.gov/pub/gps/products/trop_new/2005/001/gode0010.05zpd.gz
Combined IONEX solution for 01/01/2005 ftp://cddis.gsfc.nasa.gov/pub/gps/products/ionex/2005/001/igsg0010.05i.Z
Ultra-rapid zenith path delay files for UTC hour 2 of day 6 of GPS week 1303 (01/01/2005) ftp://cddis.gsfc.nasa.gov/pub/gps/products/trop/nrt/1303/igs60_13036_02.tro.Z
Ultra-rapid zenith path delay overview files for day 6 of GPS week 1303 (01/01/2005) ftp://cddis.gsfc.nasa.gov/pub/gps/products/trop/nrt/1303/igs60_13036.ovw.Z
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Author: Carey E. Noll
Responsible NASA Official: Ed Grayzeck
Last Updated: May 27, 2005