Publications

Shwetha, HR; Kumar, DN (2018). Performance evaluation of satellite-based approaches for the estimation of daily air temperature and reference evapotranspiration. HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, 63(9), 1347-1367.

Abstract
Different satellite-based radiation (Makkink) and temperature (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 (T-max) required in the ETo models was estimated using the temperature-vegetation index (TVX) and an advanced statistical approach (ASA), and evaluated with observed T-max obtained from automatic weather stations. Minimum air temperature (T-min) was estimated using ASA. Land surface temperature was employed in the ETo models in place of air temperature (T-a) to check the potency of its applicability. The results suggest that the PMT model with T-a 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 T-max and T-min values (r and RMSE of 0.87 and 2.17 degrees C, and 0.87 and 2.27 degrees C, respectively).

DOI:
10.1080/02626667.2018.1505046

ISSN:
0262-6667