A simple procedure for estimating distributed daily evapotranspiration using landsat-TM data |
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| Authors: | S K Ambast Ashok K Keshari A K Gosain |
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| Institution: | 1. Division of Irrigation and Drainage Engg., Central Soil Salinity Research Institute, 132 001, Karnal, India
2. Department of Civil Engg., Indian Institute of Technology Delhi, 110 016, New Delhi, India
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| Abstract: | A procedure to estimate distributed daily evapotranspiration (ET) using remotely sensed data is presented. Landsat-TM data
for a part of the Western Yamuna Canal command (Haryana) has been used for model application. The model utilizes the surface
reflectance in visible, infrared and thermal bands to generate surface albedo, surface temperature and leaf area index and
thus surface energy fluxes to determine distributed daily ET. Result reveals a reasonable estimate of distributed daily ET.
For well-watered crop, average ET by the proposed model is estimated as 1.8 mm/d, whereas using Penmen-Monteith equation it
is calculated as 1.9 mm/d. The error involved in estimating ET by the proposed model is calculated about 5%, which is quite
acceptable for most applications. The proposed procedure is also found computationally simple and can also be applied on current
Landsat ETM+ data. |
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