Indian Forum for Water Adroit

Performance evaluation of satellite-based approaches for the estimation of daily air temperature and

Subir Paul

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  • Institute : Indian Institute of Science, Bangalore
  • Programming language : Matlab, R
The work carried out by H. R. Shwetha along with Prof. D Nagesh Kumar titled "Performance evaluation of satellite-based approaches for the estimation of daily air temperature and reference evapotranspiration" was recently published in the Hydrological Sciences Journal.

Abstract: Different satellite-based radiation (Makkink) and temperature-based (Hargreaves-Samani, Penman Monteith Temperature, PMT) reference evapotranspiration (ETo) models were compared with the FAO56-PM method over the Cauvery basin, India. Maximum air temperature (Tmax) in the ETo models was estimated using temperature/vegetation index (TVX) and advanced statistical approach (ASA), and evaluated with observed Tmax obtained from automatic weather stations; minimum air temperature (Tmin) was estimated using ASA; and solar radiation data was obtained from the Kalpana-1 satellite. Land surface temperature was employed in the ETo models in place of air temperature (Ta) to check the potency of its applicability. The results suggest that the PMT model with Ta as input performed better than the other ETo models, with correlation coefficient (r) averaged root mean square error (RMSE), and mean bias error (MBE) of 0.77, 0.80 mm d−1 and –0.69 for all land cover classes. The ASA yielded better Tmax and Tmin values (r and RMSE of 0.87 and 2.17°C, and 0.87 and 2.27°C, respectively).
Subir Paul
Research Scholar (PhD)
WR&EE (CE)
IISc Bengaluru