Determination of temperature by remote sensing

• V. García-Santos ^[1] ; E. Valor ^[1] ; V. Caselles ^[1]
  1. [1] Universitat de València

     Universitat de València

     Valencia, España

     
• Localización: Tethys : revista meteorología y climatología mediterránea, ISSN 1139-3394, Nº. 7, 2010, págs. 67-74
• Idioma: inglés
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• Resumen

  • The knowledge of land surface temperature (LST) is of great importance, because it helps us tounderstand processes such as energy exchange between surface and atmosphere, water require-ments in agricultural soils, control and prevention of fires and the evolution of climate change.Also, we need to try to know its value with enough accuracy. Two important factors are takeninto account: the surrounding environmental conditions on the surface and its own emissivity.When performing a measurement of the LST, two types of corrections should be applied: first, theatmospheric correction in order to eliminate its contribution to the satellite measurements and asecond one due to the effect of surface emissivity when the measurement is done both from satel-lite and in the field. This work presents an exhaustive review of the methodology currently usedto perform both corrections. In the case of surface emissivity, the techniques known to determineit and the methodologies used for its correction will be shown. For atmospheric correction, twowidely contrasted methods are exposed: the single-channel method and the differential absorp-tion of the split-window method, which avoid the need for radiosoundings, in order to correctthe radiative effect of the atmosphere. The knowledge of the methodology shown can be of helpfor any study of the LST, either from satellite or on ground level.