Journal
INTERNATIONAL JOURNAL OF APPLIED EARTH OBSERVATION AND GEOINFORMATION
Volume 17, Issue -, Pages 76-84Publisher
ELSEVIER
DOI: 10.1016/j.jag.2011.10.011
Keywords
Latent heat flux; Landsat TM and ETM; Surface resistance
Categories
Funding
- CAS Action Plan for West Development Project Watershed Airborne Telemetry Experimental Research (WATER) [KZCX2-XB2-09-03]
- Knowledge Innovation Program of the Chinese Academy of Sciences [KZCX2-EW-312]
- National Natural Science Foundation of China [40875006]
- Chinese State Key Basic Research Project [2009CB421305]
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Estimating evapotranspiration (ET) is required for many environmental studies. Remote sensing provides the ability to spatially map latent heat flux. Many studies have developed approaches to derive spatially distributed surface energy fluxes from various satellite sensors with the help of field observations. In this study, remote-sensing-based lambda E mapping was conducted using a Landsat Thematic Mapper (TM) image and an Enhanced Thematic Mapper Plus (ETM+) image. The remotely sensed data and field observations employed in this study were obtained from Watershed Allied Telemetry Experimental Research (WATER). A biophysics-based surface resistance model was revised to account for water stress and temperature constraints. The precision of the results was validated using 'ground truth' data obtained by eddy covariance (EC) system. Scale effects play an important role, especially for parameter optimisation and validation of the latent heat flux (lambda E). After considering the footprint of EC, the lambda E derived from the remote sensing data was comparable to the EC measured value during the satellite's passage. The results showed that the revised surface resistance parameterisation scheme was useful for estimating the latent heat flux over cropland in arid regions. (C) 2011 Elsevier B.V. All rights reserved.
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