Emissivity measurements of several soils and vegetation types in the 8–14, μm Wave band: Analysis of two field methods

The two variants of the box method (with one and two lids) has been rigorously analyzed. As a result of this analysis, a correction factor that takes into account the nonideality of the materials used for the box, as well as its geometry, has been derived A simple method for determining the effective downward atmospheric temperature that uses only the temperature measurement at the zenith also has been proposed. Finally, by using one of the two variants of the box method, 72 in situ emissivity measurements in the 8–14 pin wave-band region of typical vegetation, soils, and rocks of Europe and South America, has been obtained. The use of these data for the ernissivity correction of satellite thermal measurements has been analyzed, and emissivities for the Landsat Thematic Mapper band 6 and NOAA Advanced Very High Resolution Radiometer channels 4 and 5 have been derived.