Use of MODIS satellite data and energy balance to estimate evapotranspiration
DOI:
https://doi.org/10.29312/remexca.v8i4.6Keywords:
Bell pepper, scintilometer method, triangular space method, vortex covariance systemAbstract
Evapotranspiration (ET) is an important factor for the development and production of agricultural crops, its value at local and regional level is determinant for planning the management of water resources; some techniques such as vortex covariance measure evapotranspiration in a space-determined manner, while others, such as those based on remote sensing and scintilometry, do it on a regional scale. The objective was to estimate ET using MODIS sensor data and an energy balance, and to compare it against data obtained with scintillometer and vortex covariance system. The study was implemented in Culiacán Valley, México, on a surface of Bell pepper crop, during 81 days of crop development. Normalized difference index (NDVI) and surface temperature data from the MODIS sensor, a BLS450 scintillometer to estimate sensible heat flux, and an IRGA EC-150 vortex covariance system to measure latent heat flux, were used. The total ET obtained was 255.4, 275.2 and 262 mm for MODIS, scintiloter and covariance of vortices, respectively; (RMSE), BIAS, Willmottʼs concordance coefficient (d), and correlation coefficient (R) were 0.44 mm d-1, -0.245 mm d-1, 0.8 y 0.75, respectively. The use of satellite data combined with the energy balance on the land surface allows a reliable estimation of evapotranspiration at a regional scale.
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