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
2007136963
2008140561
2009147352
2010160738
2011173029
2012326053
2013257090
2014318420
2015309302
2016453556
2017244314
2018261427
2019286151
2020248112
2021194830
2022245285
2023240198
2024213556
2025192593
202669708