Table 2.
Landsat images and corresponding National Agricultural Imaging Program (NAIP) images used to validate the Landsat surface-water extent maps. Accuracy is presented here by Landsat image.
| Landsat Path/Row | Landsat date | NAIP date(s) | Gap (days) | PHDI | SP12 | Number of points | OE (%) | CE (%) | OA (%) | DC (%) | RB (%) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| p26r32 | 28-Jun-04 | 23-Jun-04 and 07-Jul-04 | −5 to +9 days | 0.57 | 0.14 | 947 | 6.3 | 5.9 | 97.4 | 93.9 | −0.5 |
| p27r30 | 14-Jul-13 | 10-Jul-13 and 12-Jul-13 | −4 to −2 days | −0.34 | 0.05 | 707 | 11.8 | 9.3 | 92.5 | 89.5 | −2.7 |
| p29r29 | 13-Oct-06 | 25-Sep-06 | −18 days | 2.3 | −0.08 | 814 | 11.1 | 2.5 | 93.6 | 93.0 | −8.8 |
| p29r29 | 8-Oct-10 | 17-Sep-10 and 20-Sep-10 | +18 to +21 days | 9.63 | 3.06 | 959 | 1.9 | 3.3 | 97.4 | 96.4 | 1.4 |
| p31r29 | 17-Jul-04 | 10-Jul-04 and 14-Jul-04 | −7 to −3 days | −0.4 | −0.04 | 1302 | 7.4 | 1.5 | 97.2 | 95.4 | −6.0 |
| p33r28 | 13-Jul-03 | 11-Jul-03 and 15-Jul-03 | −2 to +2 days | −2.74 | −0.91 | 908 | 10.6 | 27.0 | 85.5 | 80.4 | 22.5 |
| p37r26 | 31-Jul-11 | 16-Jul-11 and 19-Jul-11 | −15 to −12 days | 2.96 | 1.29 | 498 | 16.8 | 9.7 | 90.2 | 86.6 | −7.9 |
PHDI: Palmer Hydrological Drought Index, SP12: 12 month Standardized Precipitation Index, OE: omission error for water, CE: commission error for water, OA: overall accuracy, DC: Dice coefficient, RB: relative bias