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Temporal Upscaling and Reconstruction of Thermal Remotely Sensed Instantaneous Evapotranspiration

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Xu, T., Liu, S., Xu, L., Chen ,Y., Jia, Z., Xu, Z., &Nielson, J. (2015). Temporal Upscaling and Reconstruction of Thermal Remotely Sensed Instantaneous Evapotranspiration. Remote Sensing, 7(3), 3400-3425.

Literature information
Type Of Reference JOUR
Title Temporal Upscaling and Reconstruction of Thermal Remotely Sensed Instantaneous Evapotranspiration
Authors Xu, Tongren| Liu, Shaomin| Xu, Lu| Chen, Yujie| Jia, Zhenzhen| Xu, Ziwei| Nielson, Jeffrey|
Secondary Title Remote Sensing
Abstract Currently, thermal remote sensing-based evapotranspiration (ET) models can only calculate instantaneous ET at the time of satellite overpass. Five temporal upscaling methods, namely, constant evaporative fraction (ConEF), corrected ConEF (CorEF), diurnal evaporative fraction (DiEF), constant solar radiation ratio (SolRad), and constant reference evaporative fraction (ConETrF), were selected to upscale the instantaneous ET to daily values. Moreover, five temporal reconstruction approaches, namely, data assimilation (ET_EnKF and ET_SCE_UA), surface resistance (ET_SR), reference evapotranspiration (ET_ETrF), and harmonic analysis of time series (ET_HANTS), were used to produce continuous daily ET with discrete clear-sky daily ET values. For clear-sky daily ET generation, SolRad and ConETrF produced the best estimates. In contrast, ConEF usually underestimated the daily ET. The optimum method, however, was found by combining SolRad and ConETrF, which produced the lowest root-mean-square error (RMSE) values. For continuous daily ET production, ET_ETrF and ET_SCE_UA performed the best, whereas the ET_SR and ET_HANTS methods had large errors. The annual ET distributions over the Beijing area were calculated with these methods. The spatial ET distributions from ET_ETrF and ET_SCE_UA had the same trend as ETWatch products, and had a smaller RMSE when compared with ET observations derived from the water balance method.
Date 2015/03/23/
Year 2015
DOI 10.3390/rs70303400
Database Provider www.mdpi.com
volume 7
Issue Number 3
Start Page 3400
Language en
Url http://www.mdpi.com/2072-4292/7/3/3400
Access Date 2015/10/01/07:17:45
Keywords continuously daily ET reconstruction| Evapotranspiration| regional ET production| temporal upscaling| thermal remote sensing|
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