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Satellite-based ET (mm day-1) vs. conventional methods in the Tamale Volta district.
| Method | Scale | Range | Mean | Standard deviation |
|---|---|---|---|---|
| Penman-Monteith | Local (Tamale) | 1.53 – 4.87 | 3.90 | 0.66 |
| Scintillometer | Local (Tamale) | - | 1.79 | - |
| Landsat ETM+ | Regional | 0.15 – 2.93 | 2.10 | 0.42 |
| MODIS | Regional | 0.05 – 2.83 | 2.07 | 0.37 |
| AATSR | Regional | 0.01 – 2.09 | 1.21 | 0.86 |
