Validation of global evapotranspiration product (MOD16) using flux tower data in the African Savanna, South Africa

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dc.contributor.author Ramoelo, Abel
dc.contributor.author Majozi, Nobuhle
dc.contributor.author Mathieu, Renaud
dc.contributor.author Jovanovic, Nebo
dc.contributor.author Nickless, Alecia
dc.contributor.author Dzikiti, Sebinasi
dc.date.accessioned 2014-12-01T10:21:37Z
dc.date.available 2014-12-01T10:21:37Z
dc.date.issued 2014-08-11
dc.description.abstract Globally, water is an important resource required for the survival of human beings. Water is a scarce resource in the semi-arid environments, including South Africa. In South Africa, several studies have quantified evapotranspiration (ET) in different ecosystems at a local scale. Accurate spatially explicit information on ET is rare in the country mainly due to lack of appropriate tools. In recent years, a remote sensing ET product from the MODerate Resolution Imaging Spectrometer (MOD16) has been developed. However, its accuracy is not known in South African ecosystems. The objective of this study was to validate the MOD16 ET product using data from two eddy covariance flux towers, namely; Skukuza and Malopeni installed in a savanna and woodland ecosystem within the Kruger National Park, South Africa. Eight day cumulative ET data from the flux towers was calculated to coincide with the eight day MOD16 products over a period of 10 years from 2000 to 2010. The Skukuza flux tower results showed inconsistent comparisons with MOD16 ET. The Malopeni site achieved a poorer comparison with MOD16 ET compared to the Skukuza, and due to a shorter measurement period, data validation was performed for 2009 only. The inconsistent comparison of MOD16 and flux tower-based ET can be attributed to, among other things, the parameterization of the Penman-Monteith model, flux tower measurement errors, and flux tower footprint vs. MODIS pixel. MOD16 is important for global inference of ET, but for use in South Africa's integrated water management, a locally parameterized and improved product should be developed. en_US
dc.description.sponsorship The Council for Scientific and Industrial Research en_US
dc.description.uri http://www.mdpi.com/journal/remotesensing en_US
dc.identifier.citation Ramoelo, A, Majozi, N, Mathieu, R, Jovanovic, N, Nickless, A & Dzikiti, S 2014, 'Validation of global evapotranspiration product (MOD16) using flux tower data in the African Savanna, South Africa', Remote Sensing, vol. 6, no. 8, pp. 7406-7423. en_US
dc.identifier.issn 2072-4292
dc.identifier.other 10.3390/rs6087406
dc.identifier.uri http://hdl.handle.net/2263/42726
dc.language.iso en en_US
dc.publisher MDPI en_US
dc.rights © 2014 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license. en_US
dc.subject Evapotranspiration (ET) en_US
dc.subject MOD16 en_US
dc.subject Eddy covariance en_US
dc.subject Flux tower en_US
dc.subject Penman-Monteith en_US
dc.title Validation of global evapotranspiration product (MOD16) using flux tower data in the African Savanna, South Africa en_US
dc.type Article en_US


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