**8.5. Inter-comparison of different abiotic stress indicators**

Different satellite-based abiotic stress indicators have been reported over the past. These are Temperature Vegetation Dryness Index (TVDI), Vegetation Temperature Condition Index (VTCI), water deficit index (WDI), combined deficit index (CDI) and vegetation health index (VHI). These indices use various approaches such as triangle, trapezoid, lag correlation and anomaly that use satellite-based VI, land surface temperature (LST) and rainfall. Study is being carried out on comparing the efficiencies of these indices in both *kharif* and *rabi* especially over semi-arid regions or regions having history of persistent water scarcity such as Anantpur (Andhra Pradesh), Bundelkhand region (Uttar Pradesh), Saurashtra region (Gujarat) and Jodhpur-Jaisalmer region (Rajasthan).
