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Multispectral remote sensing data were collected over the California Test Site on September 30 and October 1, 1972. The California Test Site known also as the Halloran Spring California Site is located in southeastern California about 80 miles southwest of Las Vegas, Nevada. The Halloran Spring Site is located in the High Mojave Desert within the Basin and Range physiographic province, an arid region receiving about 8 inches of annual precipitation. The site was selected by FHWA and the California Division of Highways (now Cal. Dept. of Transportation) owing to abundant rock exposures of several varieties, a contrast of landforms adjacent to the bedrock, minimal vegetation, clean dry air, and high altitude thus reducing the effects of atmospheric attenuation of electromagnetic energy.