Table 1 Status of GIM products provided by individual IAACs of the IGS (As of January 2020)

Method

SH (15 × 15)

SH (15 × 15)

Three-shell model

Tomography + Splines/Kriging

SHPTS

SH (15 × 15)

SH (15 × 15)

B-Splines

GNSSs

G + R

G + R

G + R

G

G + R + C

G + R

G + R

G + R

Predicted GIMs

 × (1, 2, 5 d)

 × (1, 2 d)

n/a

 × (2 d)

 × (1, 2, 5 d)

n/a

n/a

n/a

Rapid and final GIMs

 × (1 h)

 × (2 h)

 × (2 h)

 × (15 min, 1, 2 h)

 × (30 min)

 × (1 h)

 × (2 h)

 × (15 min, 2 h)

RT-GIMs

n/a

n/a

n/a

 × (15 min)

 × (5 min)

n/a

n/a

n/a

References

Schaer (1999), Dach et al. (2009)

Feltens (2007)

Mannucci et al. (1998), Komjathy et al. (2005)

Hernández-Pajares et al. (1999), Orús et al. (2005), García-Rigo et al. (2011)

Li et al. (2015), Yuan et al. (2016), Li et al. (2020)

Ghoddousi-Fard et al. (2011)

Zhang and Zhao (2018)

Erdogan et al. (2017), Schmidt (2018)