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
2003114749
2004119741
2005124439
2006134452
2007137319
2008140925
2009147715
2010161101
2011173394
2012326419
2013257455
2014318808
2015309667
2016454065
2017245044
2018262156
2019286881
2020248937
2021195617
2022245917
2023240559
2024214159
2025193311
2026122426