Volume 16, Issue 62 (Winte - 2013 2013)
jwss 2013, 16(62): 123-135 |
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M. A. Moradi, A. Rahimikhoob. Estimation of Reference Evapotranspiration Using NOAA Satellite Images and M5 Model Tree for Irrigation Networks - Case Study: Gazvin Irrigation Network . jwss 2013; 16 (62) :123-135
URL: http://jstnar.iut.ac.ir/article-1-2499-en.html
URL: http://jstnar.iut.ac.ir/article-1-2499-en.html
, akhob@ut.ac.ir
Abstract: (14243 Views)
Reference evapotranspiration (ET0) is a necessary parameter for calculating crop water requirements and irrigation scheduling. In this study, a method was presented as ET0 is estimated with NOAA satellite imagery in the irrigation network. In this method, a pixel from a set of pixels within the irrigation network was chosen with the highest vegetation index, and its surface temperature (Ts) with extraterrestrial radiation parameter (Ra) was used as inputs of the model. The M5 model tree for converting Ta and Ra to ET0 was used as input variables. In this research, Gazvin irrigated area was selected as a case study. A total of 231 images of NOAA satellite related to irrigation season of the study area were used. The results obtained by the M5 model were compared with the Penman–Monteith results, and error values were found within acceptable limits. The coefficient of determination (R2), percentage root mean square error (PRMSE) and the percentage mean bias error (PMBE) were found to be 0.81, 8.5% and 2.5%, respectively, for the testing data set.
Keywords: Reference evapotranspiration, NOAA satellite, Land surface temperature, Extraterrestrial radiation, M5 Model tree, Gazvin Irrigation Network
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