the indices

The monitoring system is developed by integrating state-of-the-art science and advances in technologies, and selecting a set of coupled meteo-climatic and vegetation satellite-derived indices, together with other indices related to soil and socio-economic factors, following the “convergence of evidence” concept.

The indices selected take into account the following issues

types of drought

availability of data

consistency of data

geographical characteristics

time and spatial variability

final users

Climate Based Indices​

Precipitation, as the first and main parameter pointing out drought occurrence, is used in many indices, among which the most widespread Standardized Precipitation Index (SPI) and the less known Effective Drought Index (EDI). These indices are considered better then others as providing different time scales of drought occurrence, and detecting its variation and duration.

Vegetation Based Indices

These indices focus vegetation health monitoring and are related to temperature and moisture stresses throughout a combination of NDVI or EVI, and LST parameters/indices. They represents an indirect drought responsive way to analyze the phenomenon, and satellite-derived indices are widely used for their spatiotemporal characteristics of full ground cover and quasi-continuous time observations.

the set of indices selected

About the Indices