Table 6.
Comparison of the ability of PRI (570, 525, 705), ARI (860, 790, 750), and common spectral indices to discriminate between healthy wheat and wheat infected by yellow rust for data from different databases.
| Index | Early-Mid Growth Stage (216 DAS, 225 DAS) | Mid-Late Growth Stage (230 DAS, 238 DAS) | ||||
|---|---|---|---|---|---|---|
| Overall Classification Accuracy (%) | Recall | Overall Classification Accuracy (%) | Recall | |||
| Healthy (%) | Yellow Rust (%) | Healthy (%) | Yellow Rust (%) | |||
| PRI (700,520,575) | 84.1 | 100 | 72.0 | / | / | / |
| ARI (865,790,750) | / | / | / | 93.2 | 100.0 | 90.0 |
| PRI | 81.8 | 100 | 68.0 | 90.9 | 92.9 | 90.0 |
| ARI | 79.5 | 100 | 64.0 | 90.9 | 100 | 86.7 |
| SIPI | 72.7 | 100 | 52.0 | 72.7 | 100 | 60.0 |
| NDVI | 77.3 | 100 | 60.0 | 88.6 | 92.9 | 86.7 |
| GI | 72.7 | 89.5 | 60.0 | 90.9 | 100 | 86.7 |
| MSR | 70.5 | 84.2 | 60.0 | 84.1 | 92.9 | 80.0 |
| PSRI | 72.7 | 100 | 52.0 | 81.8 | 100 | 73.3 |
| NRI | 70.5 | 89.5 | 56.0 | 90.9 | 100 | 86.7 |