The Abtew Method is a

remote sensing Remote sensing is the acquisition of information about an object or phenomenon without making physical contact with the object, in contrast to in situ or on-site observation. The term is applied especially to acquiring information about Earth ...

method for measuring

evapotranspiration Evapotranspiration (ET) is the combined processes by which water moves from the earth’s surface into the atmosphere. It covers both water evaporation (movement of water to the air directly from soil, canopies, and water bodies) and transpi ...

created by Wossenu Abtew in 1996. It is sometimes referred to as the radiative Abtew model.

Equation

The Abtew Method has advantages over other methods in that it only depends on solar radiation data. This is useful when modeling evaporation in areas where satellite remote sensing solar radiation data is the only data available. The equation is represented as

ET = K\frac

where *

ET

is evapotranspiration in millimeters/day *

K

is a dimensionless coefficient *

R_

is solar radiation measured in MJ/m^2/day *

\lambda

is latent heat of vaporization in MJ/kg

References

{{reflist Remote sensing