1. Ground-Based Global Navigation Satellite System Observation Summary Data (30-second sampling, daily files) from NASA CDDIS
  2. temporal
YearFile Count
199214838
199324076
199420289
199525727
199639344
199748025
199859330
199965693
200092136
200183678
200299611
2003113913
2004118782
2005123410
2006133200
2007136219
2008139478
2009145828
2010157991
2011168977
2012241326
2013273891
2014345426
2015328454
2016408870
2017185958
2018254648
2019278037
2020238822
2021188106
2022236189
202386400