Multiple GPS Networks


Distribution of GPS receiver network in North America. It consists of more than 1,400 permanent GPS receivers (as of December 2006).

The GPS data used for deriving the TEC data are obtained via ftp servers of Continuously Operating Reference Stations (CORS), Scripps Orbit and Permanent Array Center (SOPAC), and International GNSS Service (IGS).

FTP server:

FTP server:
 (data pocily:

FTP server:
[J. M. Dow, R. E.. Neilan, G. Gendt, "The International GPS Service (IGS): Celebrating the 10th Anniversary and Looking to the Next Decade," Adv. Space Res. 36 vol. 36, no. 3, pp. 320-326, 2005. doi:10.1016/j.asr.2005.05.125].
(data policy:

We acknowledge the IGS, UNAVCO, SCIGN and its sponsors, the W.M. Keck Foundation, NASA, NSF, USGS, SCEC for providing GPS data.

For questions and comments, please contact:
Takuya Tsugawa []