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Use of earth observation by means of remote sensing and in-situ meteorological network in integrated manner have improved ability totrack water availability and associated yield reduction in rain-fed crops as potential indicators of early warning and food security. thepresent study aims at monitoring of WRSI and production potential of rain-fed agro-ecosystems in eastern Rajasthan. The study wascarried out during the kharif season using remote sensing, meteorology and soil information from year 1998 to 2004. Important datasetsused in the study are Dekadal Normalized Difference Vegetation Index (NDVI) from SPOT-VEGETATION, gridded rainfall based on300 rain-gauge stations, reference ET (ETo), and gridded soil water holding capacity (WHC). In addition, crop statistics and cropcalendar information were also used in this study. The phenological metrices from time-series of SPOT-VGT NDVI were derived oninter-annual scales by applying Gaussian fit within TIMESAT procedure. WRSI was found promising in capturing inter-annual andspatial variability in water availability to rain-fed crops. The WRSI has also showed significant relationship with reported yieldparticularly in drone-prone areas. Water limited-yield stays on higher side but it has showed strong response to large scale drought

the international archives of the photogrammetry, remote sensing and spatial information sciences/international archives of the photogrammetry, remote sensing and spatial information sciences

USE OF EARTH OBSERVATION FOR GEOSPATIAL CROP WATER ACCOUNTING OF RAIN-FED AGRO-ECOSYSTEM IN INDIA