Journal of Food, Agriculture and Environment

Development and validation of rice evapotranspiration model based on Terra/MODIS remotely sensed data

Author(s):

Chada Narongrit ^1*, Kasem Chankao ²

Recieved Date: 2009-06-16, Accepted Date: 2009-09-29

Abstract:

The simple model was developed to estimate daily evapotranspiration (ET) by using Terra-MODIS remotely sensed data. The satellite ET model was based on the Hargreaves model which requires only two climatic variables; temperature and incident solar radiation. By using the satellite ET model, temperature in terms of LST_RS was directly calculated from brightness temperatures of MODIS channels 31 and 32; while incident solar radiation in terms of APAR_RS was calculated from NDVI_RS computed from reflectance of MODIS channels 1 and 2. ET calibrated from the model was experimented to assess sensitivity of ET on rice grown under increased temperature (2^oC.) The results showed that modeled ET had a good agreement with Penman-based ET, a typical model widely used for estimating irrigated water supply. ET_RS models showed a better correlation with LST_RS, compared to that with NDVI_RS. The experimental pots results showed that ET amount based on developed model was sufficient for water consumption of rice. ET computed from the model ranged from 3.43 to 5.56 mm/day. However, from rice’s height and leaf area growth data, it was found that the optimal amount of water supply was between 3.65-4.57 mm/day, indicating 6-17% error of the developed model.

Keywords:

MODIS, ET, LST, APAR, LAI, global warming

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Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 3&4
Category: Environment
Pages: 684-689

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