Table 4.
A comparison of the accuracy statistics generated when the validation points were randomly sampled across (1) all image extents, (2) lakes only, (3) wetlands only, (4) rivers only, and (5) using field-based water level data from the Cottonwood Lake Study Area. Validation points were generated independently for each of the five separate validation efforts. MF: matched filtered, GSW: Global Surface Water monthly product, n: number of validation points.
| Sensor | Validation | n | Omission Error (%) |
Commission Error (%) |
Overall Accuracy (%) |
Dice Coefficient (%) |
Relative Bias (%) |
|---|---|---|---|---|---|---|---|
| MF Landsat | All aquatic systems | 12,000 | 7 | 1.9 | 95.6 | 95.5 | −5.2 |
| Lakes | 2,000 | 3.6 | 1.7 | 97.4 | 97.3 | −1.9 | |
| Wetlands | 1,600 | 7.5 | 4.8 | 93.9 | 93.8 | −2.9 | |
| Rivers | 1,600 | 64.3 | 2.4 | 67.4 | 52.3 | −63.4 | |
| Field water levels | 400 | 22 | 4.4 | 87.3 | 85.9 | −18.5 | |
| GSW Landsat | All aquatic systems | 12,000 | 15.7 | 1.4 | 91.6 | 90.9 | −14.5 |
| Lakes | 2,000 | 6.4 | 1.9 | 95.9 | 95.8 | −4.6 | |
| Wetlands | 1,600 | 14.4 | 2.4 | 91.8 | 91.2 | −12.3 | |
| Rivers | 1,600 | 84.3 | 0.8 | 57.8 | 27.2 | −84.1 | |
| Field water levels | 400 | 42 | 0 | 79.2 | 73.1 | −41.8 |