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Where can I get Precise Orbit Determination (POD) products?

VLBI data are available through secure ftp and other methods. VLBI databases since 1979 are available online. Access the VLBI data via the web: https://cddis.nasa.gov/archive/vlbi/ivsdata/.

Detalied information and examples for using these methods can be found on our Achive Access page.

How can I access VLBI data at the CDDIS?

SLR data are available in subdirectories by data type, satellite, and year. The data type supported by the ILRS is on-site normal points, found in directories at https:// cddis.nasa.gov/slr/data/npt_crd.

Satellite laser ranging (SLR) data are available through secure ftp and other methods. SLR data since 1976 are available online. Access the SLR data via the web at https://cddis.nasa.gov/archive/slr/data/ . Detalied information and examples for using other methods can be found on our Achive Access p...

Information on antenna files can be found at ftp://igs.org/pub/station/general/antenna_README.pdf

More detailed information about IGS stations including site guidelines and proposing a new station can be found at igs.org/network/information.

The file https://cddis.gsfc.nasa.gov/archive/gnss/data/daily/ yyyy / ddd / yy n/brdc ddd 0. yy n.Z ( yyyy is the 4-digit year, ddd is the three-digit day of year and yy is the two-digit year) is the daily broadcast ephemeris file. This file is a merge of the individual site navigation files into one...

The igs.org/network/list.html web page provides a list of current IGS sites and links to their site logs; a map is also available.

Access to GNSS data not accessible online can be requested by contacting the CDDIS manager using the "Contact Us" button at the bottom of any CDDIS website page.