An experimental relation between the thermal ermssrvity and the Normalized Difference Vegetation Index of vegetation canopies has been found by van de Griend and Owe. This relationship is investigated by means of aradiative transfer model. The relationship was highly sensitive to soil and leaf emissivities, canopy structure, optical properties of leaves and soil in the solar domain and Sun geometry, but insensitive to viewing geometry.
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Albert Olioso (1995) studied this question.
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