Special Section on Remote Sensing for Coupled Natural Systems and Built Environments

Actual evapotranspiration estimation for different land use and land cover in urban regions using Landsat 5 data

[+] Author Affiliations
Wenjuan Liu

Northwest A&F University, College of Resource and Environment, Yangling, Shaanxi Province 712100 China

Yang Hong, Sadiq Ibrahim Khan

University of Oklahoma, School of Civil Engineering and Environmental Science, Center for Natural Hazard and Disaster Research, National Weather Center, Norman, Oklahoma 73072

Mingbin Huang

Northwest A&F University, College of Resource and Environment, Yangling, Shaanxi Province 712100 China

Baxter Vieux

University of Oklahoma, School of Civil Engineering and Environmental Science, Center for Natural Hazard and Disaster Research, National Weather Center, Norman, Oklahoma 73072

Semiha Caliskan

University of Oklahoma, Department of Geography, Center for Spatial Analysis, Norman, Oklahoma 73019

Trevor Grout

University of Oklahoma, School of Civil Engineering and Environmental Science, Center for Natural Hazard and Disaster Research, National Weather Center, Norman, Oklahoma 73072

J. Appl. Remote Sens. 4(1), 041873 (November 19, 2010). doi:10.1117/1.3525566
History: Received April 2, 2010; Revised November 5, 2010; Accepted November 8, 2010; November 19, 2010; Online November 19, 2010
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Abstract

Evapotranspiration (ET) is deemed critical for water resources management. Even in the same climatic and meteorological conditions, actual ET (ETa) may exhibit remarkable spatial variability across different vegetation covers, agricultural land use practices, and differing types of urban land development. The main objectives of this study are (1) to evaluate the possible closure of the heat balance equation using Oklahoma's unique environmental monitoring network; and (2) to estimate ETa and determine the variation with regards to varying types of land use and land cover in urban settings. In this study, a Surface-Energy-Balance ET algorithm was implemented to estimate ETa at a higher spatial resolution using Landsat 5 satellite images while the Oklahoma Mesonet observations can be used as our ground truth data. Accuracy of the estimated ETa was assessed using latent heat flux measurements provided by AmeriFlux towers. The associated bias ratios of daily mean ETa with respect to both burn and control sites are -0.92%, and -8.86% with a correlation of 0.83 and 0.81, respectively. Additionally, estimated ETa from a water balance budget analysis and the remotely sensed ETa are cross-validated with a low bias ratio of 5.2%, and a correlation coefficient of 0.7 at the catchment scale. The lowest ETa was observed for developed urban areas and highest for open water bodies. The ETa difference is also demonstrated from two contrasting counties. The results show Garfield County (agricultural) has higher ETa values than Oklahoma County (urban) for all land cover types except open water bodies.

© 2010 Society of Photo-Optical Instrumentation Engineers

Citation

Wenjuan Liu ; Yang Hong ; Sadiq Ibrahim Khan ; Mingbin Huang ; Baxter Vieux, et al.
"Actual evapotranspiration estimation for different land use and land cover in urban regions using Landsat 5 data", J. Appl. Remote Sens. 4(1), 041873 (November 19, 2010). ; http://dx.doi.org/10.1117/1.3525566


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