Shelter temperature, its minimum/maximum values along with canopy temperature are important factors of consideration for assessment of crop development and crop stress. Shelter temperature is more directly related to the air temperature than the surface temperature. Observations from atmospheric sounders like TOVS (TIROS-N Operational Vertical Sounder) are used in methods for estimating shelter temperature. A simple linear regression approach is generally used to derive shelter temperature from satellite soundings. (A brief description of sounding principles is given in next section). Collocated and coincident sets of satellite soundings and shelter temperature observations are used to develop regression coefficients (Davis and Tarpley, 1983). This method provides the shelter temperature with an accuracy of about 2o C. In winter time, a temperature inversion generally persists over the cold ground. This results in a bias of 1-2o C (satellite estimates being warmer) in the nighttime estimates of shelter temperature during winter.
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