1. Ground-Based Global Navigation Satellite System (GNSS) Observation Data (30-second sampling, daily, 24 hour files) from NASA CDDIS
  2. temporal
YearFile Count
199215954
199325182
199422671
199533117
199640507
199748737
199859582
199965864
200092285
200183813
200299610
2003114367
2004118177
2005123569
2006133415
2007136293
2008139564
2009145824
2010158112
2011170081
2012258457
2013250642
2014309697
2015290224
2016362712
2017191447
2018204471
2019170694
2020138052
202190322
202299513
202328242