GROUND-TRUTH RESEARCH FOR AN AIRBORNE MULTISENSOR SURVEY PROGRAM.
TEXAS INSTRUMENTS INC DALLAS
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The program involved 1 the testing of the applicability of the Barnes Engineering Company Model PRT 14-313 portable infrared thermometer to ground-truth measurement operations and 2 investigation of the influence of variations in sky conditions and radiometer aspect angles on radiometric temperatures and emissivity factors. Findings show that the PRT 14-313 radiometer is usable in ground-truth procedures but that design limitations very seriously reduce its effectiveness. Analysis of empirical data indicates that radiometric temperatures of foliage are more a function of environmental conditions than of sky conditions, radiometer aspect angles or leaf orientations. On samples of asphalt, concrete and soil surfaces, however, the influence of variations in sky conditions and aspect angles on radiometric temperatures is quite pronounced, and it is recommended that any attempts at emissivity determinations be conducted under clear sky at night with aspect angles near normal incidence, if possible, but in no case at aspect angles less than 50 degrees. Author
- Cartography and Aerial Photography