Table 1 Definition of VHIs.
VHIs | Full name | Definition | Range |
|---|---|---|---|
NDVI | Normalized Difference Vegetation Index | NDVI = (NIR-VIS)/(NIR + VIS) | [− 1, 1] |
BT | Brightness Temperature | IR4 for AVHRR, or IR5 for VIIRS | N/A |
SMN | Smoothed NDVI | No noise NDVI | [−1, 1] |
SMT | Smoothed BT | No noise BT | N/A |
VCI | Vegetation Condition Index | VCI = 100 × (SMN-SMNmin)/(SMNmax − SMNmin) | [0, 100] |
TCI | Temperature Condition Index | TCI = 100 × (SMTmax − SMT)/(SMTmax − SMTmin) | [0, 100] |
VHI | Vegetation Health Index | VHI = a × VCI + (1 − a) × TCI | [0, 100] |
