Remote Sensing-Based Evapotranspiration Modelling for Agricultural Water Management in the Limpopo Basin

IF 1.3 Q4 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
B. Alemaw, T. R. Chaoka, B. Munyai
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引用次数: 2

Abstract

The study was motivated by the need to determine the spatial variation of ET and to test the applicability of RS based methods in arid to semi-arid climates with limited ground-based measurements. In this paper we present results of an effort of determining spatial actual evapotranspiration in the Limpopo basin, the Notwane subcatchment in the south-eastern part of Botswana, using remote sensing data from MODIS and Landsat Data sets. The Simplified Surface Energy Balance Index (S-SEBI) was applied to determine actual evapotranspiration using the seven bands of Landsat and MODIS surface reflectance and temperature channels. Three different dates were used to estimate ET from both Landsat and MODIS scenes. The estimated ET values from the two sensors show approximately equally comparable results. An assessment was also conducted to determine the factors influencing evapotranspiration. No strong correlation was identified for ET against the five factors investigated: Net radiation, NDVI, Surface Temperature, emissivity and surface albedo.
基于遥感的林波波河流域农业用水管理蒸散模拟
该研究的动机是需要确定ET的空间变化,并在有限的地面测量条件下测试基于RS的方法在干旱至半干旱气候下的适用性。在本文中,我们介绍了利用MODIS和Landsat数据集的遥感数据确定博茨瓦纳东南部notane小流域林波波流域空间实际蒸散量的结果。采用简化地表能量平衡指数(S-SEBI),利用Landsat和MODIS地表反射率和温度通道的7个波段确定实际蒸散量。使用了三个不同的日期来估算来自Landsat和MODIS场景的ET。两个传感器估算的ET值显示出大致相等的可比较结果。还进行了评估,以确定影响蒸散发的因素。ET与净辐射、NDVI、地表温度、发射率和地表反照率这5个因子之间没有很强的相关性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Agricultural and Environmental Information Systems
International Journal of Agricultural and Environmental Information Systems COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS-
CiteScore
6.70
自引率
0.00%
发文量
10
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