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
200092286
200183813
200299610
2003114367
2004118177
2005123716
2006133786
2007136546
2008139764
2009146470
2010159188
2011171504
2012259350
2013251717
2014310804
2015291653
2016364600
2017193746
2018207435
2019174905
2020142620
202194734
2022104048
202381718
202423560