Tunisia Vegetation
Indicators and Variables
Indicators and Variables
NDVI measures vegetation activity and greenness. Higher values generally indicate healthier and denser vegetation, while lower values indicate sparse or stressed vegetation.
NDVI anomaly shows how different the current NDVI is from its normal or reference condition. Negative values generally indicate vegetation conditions below normal.
PET represents the amount of water that could potentially be lost through evaporation and plant transpiration if sufficient water were available. Higher PET indicates greater atmospheric water demand.
Rainfall represents the amount of precipitation received during the considered period. Low rainfall can contribute to the development or intensification of drought conditions.
Soil moisture represents the amount of water contained in the soil. It is an important indicator of water availability for vegetation and agriculture.
Soil moisture anomaly indicates how much the current soil moisture differs from its normal or reference condition. Negative values indicate drier-than-normal soil conditions.
This expresses the soil moisture anomaly as a percentage, making it easier to compare the departure from normal conditions.
TCI is an indicator derived from temperature conditions and is used to assess vegetation stress related to temperature. Lower values generally indicate greater temperature-related stress.
VCI measures the relative condition of vegetation compared with its historical range. Lower values generally indicate poorer vegetation conditions and possible drought stress.
VHI combines vegetation and temperature conditions to provide an overall indication of vegetation health and drought stress. Lower values generally indicate more severe vegetation stress.