Earthdata
CMR Virtual Directories

Ground-Based Global Navigation Satellite System Data (30-second sampling, 1 hour files) from NASA CDDIS
temporal

Year	File Count
2008	15952
2009	24735
2010	25749
2011	26379
2012	823247
2013	3446727
2014	4982025
2015	4594720
2016	308705
2017	312418
2018	310148
2019	126285

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NASA Official: Stephen Berrick
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