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
199640873
199749152
199860254
199966923
200093160
200184218
2002100123
2003114749
2004119741
2005124446
2006134517
2007137361
2008140980
2009147736
2010161112
2011173395
2012326424
2013257458
2014318812
2015309671
2016454093
2017245080
2018262156
2019286919
2020248947
2021195630
2022246054
2023240559
2024214167
2025193368
2026138180