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<p>This study evaluated the sensitivity of TAWS detection range calculations to the spatial resolution of scenario  backgrounds. Sixteen independent sites were analyzed to determine TAWS background. Multispectral satellite data  were processed to different spatial resolutions from 1m to 8km. The resultant imagery was further processed to  determine TAWS background type. The TAWS background type was refined to include soil moisture characteristics.  Soil moisture analyses were obtained using in situ measurements, the Air Force's Agricultural-Meteorological  (AGRMET) model and the Army's Fast All-seasons Soil Strength (FASST) model. The analyzed imagery was  compared to the current default 1o latitude by 1o of longitude database in TAWS. The use of the current default TAWS  background database was shown to result in TAWS ranges differing from the 1m standard range by 18-23%. The  uncertainty was reduced to 5% when background resolution was improved to 8km in rural areas. By contrast, in urban  regions the uncertainty was reduced to 14% when spatial resolution was reduced to 30m. These results suggest that  the rural and urban designations are important to the definition of a background database.
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<br>Subjects: Remote sensing; Soil moisture; Measurement; Weather forecasting; Computer programs; TAWS; Target Acquisition Weapons Software; Background soil; Moisture range; Uncertainty; Multispectral; Agricultural-Meteorological; AGRMET; Fast All-seasons Soil Strength; FASST; Urban rural model</div>
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Pearcy, Charles M.</div>
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