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
199532937
199640509
199748761
199859586
199966022
200092558
200183925
200299827
2003114372
2004119081
2005123783
2006133800
2007136662
2008139449
2009146690
2010160009
2011172303
2012325309
2013256358
2014317702
2015308579
2016452831
2017243593
2018260492
2019283878
2020245946
2021193205
2022241203
2023233602
202463013