Page Banner

United States Department of Agriculture

Agricultural Research Service

Title: Surface Heat Flux Estimates from Satellite Imagery

Authors
item Schmugge, Thomas
item FRENCH, ANDREW
item KUSTAS, WILLIAM

Submitted to: Global Energy and Water Cycle Conference Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: July 1, 2001
Publication Date: N/A

Technical Abstract: The recent availability of multi-band thermal infrared imagery from the Advanced Spaceborne Thermal Emission & Reflection radiometer (ASTER) on NASA's Terra satellite has made feasible the estimation of evapotranspiration at 90 meter resolution. One critical variable in evapotranspiration models is surface temperature. With ASTER the temperature can be reliably determined over a wide range of vegetative conditions. The requirements for accurate temperature measurement include minimization of atmospheric effects, correction for surface emissivity variations and sufficient resolution for the type of vegetative cover. When ASTER imagery are combined with meteorological observations, these requirements are usually met and result in surface temperatures accurate within 1-2 C. ASTER-based evapotranspiration estimates for a few days during 2000 were made over sub-humid grazing and wheat lands near El Reno in central Oklahoma. Daily evapotranspiration was estimated by applying instantaneous ASTER surface temperatures, as well as ASTER-based vegetation indices from visible-near infrared bands, to a two-source energy flux model and combining the result with separately acquired hourly solar radiation data. The estimates of surface fluxes show reasonable agreement (50-100 W/m^2) with ground-based eddy-correlation measurements and illustrate how ASTER measurements can be applied to heterogeneous terrain.

Last Modified: 8/19/2014
Footer Content Back to Top of Page