Aerial temperatures

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Aerial observations of surface temperature were were carried out in conjunction with the photographic surveys. A Heimann Kt-19 infrared radiometer recording in a wavelength band of 8-14microns was mounted looking directly downward below the helicopter. Its field of view was approximately 2 degrees providing a spatial resolution at the surface of 1/30^th of the altitude or about 50 meters at 5000’. Data were sampled at 1 Hz.