Open Access
Table 1.
Evolution of the CODE GIMs characteristics used in this study.
| Period |
|||||
|---|---|---|---|---|---|
| Beginning (YYYY-DDD) | End (YYYY-DDD) | Time span (year) | VTEC maps type | Stations | Satellites |
| 1995-001 | 1997-032 | 2.09 | 1 map at 12:00 UT | 50–86 | ~24 ? |
| 1997-033 | 1997-054 | 0.06 | Each 2 h (12 maps) + RMS | 72–92 | 24–25 |
| 1997-055 | 1998-086 | 0.09 | 1 map at 12:00 UT | 42–99 | 24–27 |
| 1998-087 | 1998-098 | 0.03 | Each 2 h (12 maps) | 76–80 | 27–27 |
| 1998-099 | 2009-275 | 12.48 | Each 2 h (12 maps) + RMS | 73–261 | 25–36 |
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