| Early spring | |||
| Date of acquisition | Cloud cover (%) | elevation angle | Satellite azimuth angle |
| 1986/04/31 | −10% | 59.55 | 0 |
| 1990/04/04 | −10% | 53.69 | 0 |
| 1992/04/01 | −10% | 52.05 | 0 |
| 1993/03/04 | −10% | 49.88 | 0 |
| 1994/04/08 | −10% | 49.55 | 0 |
| 1995/04/02 | −10% | 43.43 | 0 |
| 1996/03/12 | −10% | 54.95 | 0 |
| 1998/03/02 | −10% | 48.07 | 0 |
| 1999/03/21 | −10% | 61.01 | 0 |
| 2000/04/31 | −10% | 52.21 | 0 |
| 2001/03/17 | −10% | 44.60 | 0 |
| 2003/04/01 | −10% | 43.92 | 0 |
| 2004/03/09 | −10% | 47.91 | 0 |
| 2007/03/11 | −10% | 54.22 | 0 |
| 2008/03/13 | −10% | 43.07 | 0 |
| 2009/03/16 | −10% | 47.34 | 0 |
| 2010/03/19 | −10% | 51.09 | 0 |
| 2011/04/07 | −10% | 60.24 | 0 |