Skip to main content

Research Repository

Advanced Search

Intercomparison of Evapotranspiration Over the Savannah Volta Basin in West Africa Using Remote Sensing Data

Opoku-Duah, S.; Donoghue, D.; Burt, T.

Intercomparison of Evapotranspiration Over the Savannah Volta Basin in West Africa Using Remote Sensing Data Thumbnail


Authors

S. Opoku-Duah



Abstract

This paper compares evapotranspiration estimates from two complementary satellite sensors – NASA’s Moderate Resolution Imaging Spectroradiometer (MODIS) and ESA’s ENVISAT Advanced Along-Track Scanning Radiometer (AATSR) over the savannah area of the Volta basin in West Africa. This was achieved through solving for evapotranspiration on the basis of the regional energy balance equation, which was computationally-driven by the Surface Energy Balance Algorithm for Land algorithm (SEBAL). The results showed that both sensors are potentially good sources of evapotranspiration estimates over large heterogeneous landscapes. The MODIS sensor measured daily evapotranspiration reasonably well with a strong spatial correlation (R2=0.71) with Landsat ETM+ but underperformed with deviations up to ~2.0 mm day-1, when compared with local eddy correlation observations and the Penman-Monteith method mainly because of scale mismatch. The AATSR sensor produced much poorer correlations (R2=0.13) with Landsat ETM+ and conventional ET methods also because of differences in atmospheric correction and sensor calibration over land.

Citation

Opoku-Duah, S., Donoghue, D., & Burt, T. (2008). Intercomparison of Evapotranspiration Over the Savannah Volta Basin in West Africa Using Remote Sensing Data. Sensors, 8(4), 2736-2761. https://doi.org/10.3390/s8042736

Journal Article Type Article
Acceptance Date Mar 19, 2008
Online Publication Date Apr 17, 2008
Publication Date Apr 17, 2008
Deposit Date Apr 1, 2019
Publicly Available Date Mar 29, 2024
Journal Sensors
Publisher MDPI
Peer Reviewed Peer Reviewed
Volume 8
Issue 4
Pages 2736-2761
DOI https://doi.org/10.3390/s8042736

Files





You might also like



Downloadable Citations