EVALUATION OF A MODEL TO ESTIMATE NET RADIATION OVER A DRIP-IRRIGATED OLIVE ORCHARD USING LANDSAT SATELLITE IMAGES
Satellite-based remote sensing tools estimate crop water requirements based on surface energy balance, where the net radiation (Rn) is the most important factor. In this regard, a study was carried out to validate the METRIC (Mapping EvapoTranspiration at high Resolution with Internalized Calibration) model for estimating instantaneous values of net radiation (Rni) over a drip-irrigated olive orchard which is located in the Pencahue Valley, Maule Region, Chile (lat. 35°23S; long. 71°44W; 96 m above mean sea level). The performance of the METRIC model to compute Rni was carried out using ground-based measurements of net radiation at the time of satellite overpass (11:28 h). For this study, 12 landsat images were acquired during clear sky days between 2009 and 2012. The statistical analysis indicated that the METRIC model underestimated the values of Rni by about 3% with a root mean square error (RMSE) and mean absolute error (MAE) of 40 and 33 W m-2, respectively.
Ortega-Farías, S., Ortega-Salazar, S., Aguilar, R., De la Fuente, D. and Fuentes, F. (2014). EVALUATION OF A MODEL TO ESTIMATE NET RADIATION OVER A DRIP-IRRIGATED OLIVE ORCHARD USING LANDSAT SATELLITE IMAGES . Acta Hortic. 1057, 309-314
'Arbequina', net radiation, remote sensing, METRIC