Table 4 Summary of estimated NDWI thresholds in different seasons
Year/Month | Threshold between vegetation and water | Threshold between barren land and water | Sample size of barren land (pixels) | Sample size of vegetation (pixels) | Sample size of water (pixels) |
|---|---|---|---|---|---|
2007/06 |  − 0.04 |  − 0.07 | 286 | 295 | 291 |
2007/07 |  − 0.05 |  − 0.15 | 299 | 300 | 297 |
2007/08 |  − 0.05 |  − 0.16 | 299 | 300 | 300 |
2007/09 |  − 0.07 |  − 0.12 | 144 | 194 | 185 |
2012/06 |  − 0.04 |  − 0.12 | 159 | 189 | 178 |
2012/07 |  − 0.05 |  − 0.14 | 284 | 288 | 274 |
2012/08 |  − 0.05 |  − 0.13 | 297 | 298 | 297 |
2012/09 |  − 0.03 |  − 0.10 | 116 | 113 | 121 |
2017/06 |  − 0.02 |  − 0.05 | 229 | 272 | 256 |
2017/07 |  − 0.04 |  − 0.15 | 299 | 300 | 300 |
2017/08 |  − 0.04 |  − 0.16 | 300 | 300 | 300 |
2017/09 |  − 0.04 |  − 0.08 | 130 | 124 | 139 |