Earthdata
CMR Virtual Directories

Ground-Based Global Navigation Satellite System Observation Summary Data (30-second sampling, daily files) from NASA CDDIS
temporal
2018
12

Day	File Count
01	809
02	818
03	811
04	822
05	843
06	807
07	814
08	816
09	802
10	827
11	823
12	825
13	814
14	810
15	826
16	793
17	788
18	810
19	793
20	800
21	810
22	792
23	796
24	799
25	834
26	801
27	816
28	776
29	763
30	771
31	794

NASA Links

NASA Official: Stephen Berrick
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