2024, Vol. 7, Special Issue 1

author(s)
N Naga Hari Sairam, A Mani, HV Hema Kumar, KVS Rami Reddy and K Srinivasulu

abstract
Evapotranspiration (ET) plays a major role in taking decisions related to water resource and agricultural management. It is difficult to measure at large spatial scales due to its spatial variability. In order to overcome this challenge, satellite remote sensing is a promising technology which has been used to provide reasonable estimate of ET under the assumption that energy storage by the canopy is negligible. The actual ET remote sensing product is being generated at 5.5 Km² spatial resolution under National Hydrology Project (NHP). Google Earth Engine is a cloud computing platform used to analyse the actual ET across various spatial scales. Therefore, estimation of average monthly actual ET was determined using Google Earth Engine and monthly actual ET products during 2019-2020 in the Godavari districts of Andhra Pradesh. From the analysis, high values of monthly AET during 2019-2020 was observed in the months of June, July, August and September whose values are 4.25 mm/day, 4.69 mm/day, 4.81 mm/day and 4.84 mm/day. The low values of monthly AET during 2019-2020 was observed in the months of January, February and December 1.79 mm/day, 2.53 mm/day and 1.49 mm/day.From the above analysis, it is clear that satellite remote sensing ET products and Google earth engine plays crucial role in analysing the datasets spatially as well as temporally.