Data Summary
IGS operational products include precise GNSS satellite ephemerides, positions and velocities of stations in the global GNSS network, EOPs (polar motion and rates, length-of-day), and station and satellite clock solutions. Other products derived from the CDDIS GNSS data holdings include troposphere Zenith Path Delay (ZPD) estimates (both dry and wet components) and global ionosphere maps, both in support of IGS Working Groups or Pilot Projects.Spatial Coverage
- List of GNSS sites (Tracking Network)
- Map of GNSS sites
Product Holdings
- Precise orbits
- Clock products
- Reference frame
- Ionosphere/Troposphere
- MGEX
- MEaSUREs products
- Differential code bias
- Real-time products
- GUARDIAN Near-Real-Time Ionospheric Total Electron Content
- JPL Global Differential GPS products
Temporal Coverage
- GNSS orbit, station position, and EOP products since June 1992
- Troposphere Zenith Path Delay (ZPD) products since January 1997
- Ionosphere Total Electron Content (TEC) products since June 1998
Data Volume
- Weekly and daily GNSS orbits, station position, and EOP files: ~1.8 Gbytes/week (compressed)
- Daily troposphere files: ~3.7 Mbytes/day (compressed)
- Daily ionosphere files: ~5.5 Mbytes/day (compressed)
Data Formats
- GNSS precise orbits: SP3 and SP3c (typically) formats
- GNSS Earth rotation parameters: IGS-specified format
- GNSS station positions: Software INdependent EXchange (SINEX) format
- GNSS troposphere ZPD: IGS-specified format
- GNSS ionosphere TEC: Ionosphere Exchange (IONEX) format