Remote Sensing of Evapotranspiration

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Presentation transcript:

Remote Sensing of Evapotranspiration The Surface Energy Balance Algorithm for Land (SEBAL) Remote Sensing of Evapotranspiration

What is MODIS? Moderate-Resolution Imaging Spectroradiometer Launched in 1999 aboard the EOS AM (Terra); EOS PM (Aqua) followed in 2002 Monitors 36 spectral bands between 0.4 m and 14.4 m Images entire Earth every 1-2 days at 1 km resolution X data products provided by NASA with full QA/QC

Accessing MODIS Data Level 1 and Atmosphere Archive and Distribution System (LAADS) Warehouse Inventory Search Tool (WIST) submits orders via EOS ClearingHouse (ECHO) Direct access via FTP HDF files can be manipulated with C, Fortran, Perl, MATLAB, IDL, Mathmatica and now ArcGIS

ET= 𝑅𝑛 − 𝐿𝑆𝑇∗𝑎+𝑏 𝑐𝑝∗ρ𝑎 𝑟𝑎ℎ ∗3600 ∗ ℎ/ 2450000 Sensible Heat Flux

Evapotranspiration and Land Use

Validating the Method

ET

SEBAL vs Flux Tower Data

Next Steps Develop principle for constraining maximum evapotranspiration Develop principle for estimating net radiation on cloudy days Any Questions?

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