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
199749152
199860254
199966917
200093159
200184216
2002100122
2003114670
2004119384
2005124084
2006134100
2007136962
2008139749
2009146988
2010160373
2011172665
2012325687
2013256725
2014318056
2015308938
2016453192
2017243946
2018261056
2019285785
2020247949
2021194739
2022245271
2023240004
2024212070
2025147181