Estimation of water requirements for a drip-irrigated apple orchard using Landsat 7 satellite images

D. De La Fuente-Sáiz, S. Ortega-Farías, S. Ortega-Salazar, M. Carrasco-Benavides, A. Kilic, R. Allen

Research output: Chapter in Book/Report/Conference proceedingChapter


A study was carried out to evaluate the METRIC (Mapping EvapoTranspiration at high Resolution with Internalized Calibration) model to estimate water requirements or actual evapotranspiration (ETa) for a drip-irrigated apple orchard located in the Maule Region, Chile (lat. 35°25'S; long. 71°23'W; 189 m above mean sea level). For estimating ETa using the METRIC model, seven satellite images (Landsat 7 ETM+) acquired during clear sky days were used from the 2012-2013 growing season. The performance of METRIC was evaluated using measurements of ETa from an Eddy Covariance system (EC) at the time of satellite overpass (11:30 h). The statistical analysis indicated that the METRIC model overestimated ETa values by about 7% with a root mean square error (RMSE), mean absolute error (MAE) and index of agreement (d) of 0.42 mm d-1, 0.29 mm d-1 and 0.88, respectively. Main errors of the METRIC model were associated with the selection of the hot pixels which were difficult to obtain for some satellite images.

Original languageEnglish (US)
Title of host publication8th International Symposium on Irrigation of Horticultural Crops
EditorsJ. Girona, J. Marsal
PublisherInternational Society for Horticultural Science
Number of pages8
ISBN (Electronic)9789462611450
StatePublished - Jan 25 2017

Publication series

NameActa Horticulturae
ISSN (Print)0567-7572


  • Apple
  • Evapotranspiration

ASJC Scopus subject areas

  • Horticulture


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