The Grape Remote sensing Atmospheric Profile and
Evapotranspiration eXperiment (GRAPEX) has a goal of developing remote sensing-based
evapotranspiration (ET) toolkit using earth observations for monitoring
vineyard water use and stress from with-in vineyard block to regional scales in
the California Central Valley. To enhance sustainability of vineyards in this
region, which experiences frequent drought, this information is key to reducing
water use while maintaining yield and quality. Through this research project,
measurements of vine physiology, soil moisture, water, carbon and energy
exchange processes and relationships between remote sensing retrieval
algorithms of vine biomass, leaf area, land surface temperature and vineyard
fluxes have advanced the understanding of modeling vine water use and stress.
This presentation will provide a summary of key GRAPEX findings from in situ and
remote sensing observations collected from the leaf and canopy level to the
field and landscape scales in estimating vine water use and stress. Future
research directions will also be discussed.