1. Ground-Based Global Navigation Satellite System (GNSS) Compact Observation Data (30-second sampling, daily, 24 hour files) from NASA CDDIS
  2. temporal
YearFile Count
19925712
199317105
199422643
199532945
199640872
199749115
199860136
199966917
200093159
200184216
2002100122
2003114670
2004119384
2005124084
2006134100
2007136962
2008139749
2009146988
2010160373
2011172665
2012325687
2013256725
2014318056
2015308938
2016453192
2017243844
2018260628
2019284963
2020247584
2021194096
2022242479
2023236409
2024205986
202542791