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The ftp archive of SLR data, products, and predictions 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 SLR 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 SLR ftp structure at the CDDIS is divided into several tables:
- Table 1: Overview of the ftp structure for SLR data, products, and predictions
- Table 2: Detailed diagram of the directory structure for SLR data
- Table 3: Detailed diagram of the directory structure for SLR prediction information
- Table 4: Detailed diagram of the directory structure for SLR products
- Table 5: Substitution codes for directories and filenames
- Table 6: Examples
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Table 1. Overview of CDDIS FTP Structure for SLR Data, Products, and Predictions
| /pub |
/slr |
/data |
/fr |
/satname |
/yyyy |
satname_v.yymm.Z |
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| /daily |
/ssss |
ssss_yymmdd_v.satname.Z |
| /npt |
/yyyy |
satnamev_npt.yymm.Z |
| /npt |
/satname |
/yyyy |
satname.yymmdd
satname.yymm
satnameh.yymmdd |
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| /predicts |
/yyyy |
/satname |
satname_type_yymmdd_#.source |
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| /current |
satname_type_yymmdd_#.source |
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| /maneuvers |
satname_maneuver_yymmdd.source
maneuvers.satname |
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| /products |
/pos+eop |
/yymmdd |
ac.eop.yymmdd.v#.snx.Z
ac.pos+eop.yymmdd.v#.snx.Z
ac.pos+eop.yymmdd.v#.sum.Z |
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| MORE |
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Table 2. CDDIS FTP Structure for SLR Data
/pub |
/slr |
MORE |
/data |
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/fr |
/npt |
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/satname |
/satname |
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/yyyy |
/daily |
/npt |
/yyyy |
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satname_v.yymm.Z |
/ssss |
/yyyy |
satnameh.yymmdd |
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ssss_yymmdd_v.satname.Z |
satnamev_npt.yymm.Z |
satname.yymmdd |
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satname.yymm |
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| SLR monthly full-rate data |
SLR daily full-rate data |
SLR monthly normal points from full-rate data |
SLR on-site normal point
data (hourly, daily, and monthly) |
SLR prediction files |
SLR product files |
Other data |
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Table 3. CDDIS FTP Structure for SLR Prediction Files
/pub |
/slr |
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/predicts |
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/yyyy |
/current |
/maneuvers |
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/satname |
satname_type_yymmdd_#.source |
satname_maneuver_yymmdd.source |
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satname_type_yymmdd_#.source |
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maneuvers.satname |
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| SLR data |
SLR prediction yearly prediction files |
Current SLR prediction files |
SLR maneuver files |
SLR products |
Other data |
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Table 4. CDDIS FTP Structure for SLR Products
/pub |
/slr
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/products |
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/pos+eop |
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/yymmdd |
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ac.eop.yymmdd.v#.snx.Z |
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ac.pos+eop.yymmdd.v#.snx.Z |
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ac.pos+eop.yymmdd.v#.sum.Z |
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| SLR data |
SLR predictions |
Weekly SLR pos+eop product files in SINEX format |
Other data |
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Table 5. Substitution Codes for Directories and Filenames
| Code |
Description |
Range |
Example |
| yyyy |
4-digit year |
1976-present |
2005 |
| yy |
2-digit year |
76-present |
05 |
| mm |
2-digit month of year |
01-12 |
01 |
| dd |
2-digit day of month |
01-31 |
01 |
| h |
1-character UTC hour of day |
a-x (a=00, b=01, ..., x=23) |
01 |
| satname |
satellite full name |
Full list |
lageos1 |
| ssss |
4-digit station number |
N/A |
7105 |
| type |
type of prediction file |
drag=drag functions
ephemeris=ephemeris file in TIRV format
irvs=ephemeris file in IRV format
sao=SAO elements
tle=two line element
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ephemeris |
| v |
version number of data file |
a-d |
a |
| # |
version number of solution |
1-9 |
1 |
| ac |
analysis center |
ilrsa=ILRS primary product center
ilrsb=ILRS backup combination center
asi=Italian Space Agency, Italy
dgfi=Deutsches Geodtisches ForschungsInstitut, Germany
gfz=GeoForschungsZentrum, Germany
jcet=Joint Center for Earth Systems Technology, USA
ncl=Newcastle University, UK
nsgf=NERC Space Geodesy Facility, UK
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ilrsa |
Table 6. Examples
| SLR Data/Product Type |
Location of Example File in CDDIS ftp Archive |
| Monthly full-rate LAGEOS-1 SLR data for 01/2005 |
ftp://cddis.gsfc.nasa.gov/pub/slr/data/fr/lageos1/2005/lageos1_a.0501.Z |
| On-site LAGEOS-1 normal point data received
on 01/01/2005 |
ftp://cddis.gsfc.nasa.gov/pub/slr/data/npt/lageos1/2005/lageos1.050101 |
| Monthly o n-site LAGEOS-1 normal point data
for 01/2005 |
ftp://cddis.gsfc.nasa.gov/pub/slr/data/npt/lageos1/2005/lageos1.0501 |
| Official ILRS SINEX file (latest version) ending on day 01/01/2005 |
ftp://cddis.gsfc.nasa.gov/pub/slr/products/pos+eop/050101/ilrsa.pos+eop.050101.v1.snx.Z |
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